feat(lfx): add extension init and extension dev CLIs (LE-1016)#12968
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## feat/extension-production-install #12968 +/- ##
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…matter (LE-1014) Foundation for the Bundle Separation iteration. Defines what a valid extension.json looks like (Pydantic models + Draft 2020-12 JSON Schema), ships the offline `lfx extension validate` command, and ships the single `format_extension_error` function that every other extension-system module will use to render structured errors. What's in lfx.extension: - `ExtensionManifest` / `BundleRef` / `LangflowCompat` Pydantic models with `extra="forbid"` so unknown fields fail loudly. Deferred fields (`services`, `routes`, `hooks`, `starter_projects`, `userConfig`) are reserved as None-only so non-null values produce a dedicated `field-deferred-in-this-milestone` error instead of a generic schema wall. `bundles` accepts a list but rejects length > 1 with `multi-bundle-deferred-in-this-milestone` (validator-enforced; the loader re-checks at install time in LE-1015). - `schema.build_schema()` + `build_schema_json()` produce the publishable artifact at schemas.langflow.org/extension/v1.json. - `ExtensionError` typed envelope and `format_extension_error` -- one branch per discriminant. Codes are registered in `ERROR_CODES`; an `ExtensionError` constructed with an unknown code raises at construction time, preventing producers from shipping without a matching renderer. - `validate_extension` runs four passes: manifest discovery + schema, path-safety (no `..`, no absolute paths, no symlink escape), AST inspection of every `.py` (syntax, Component subclass present, build() declared, top-level `import *`, top-level I/O primitives), and an opt-in `--execute-imports` that runs each module in a subprocess with a temporary HOME / TMPDIR / LANGFLOW_CONFIG_DIR and LANGFLOW_*/LFX_* env vars stripped. - `lfx extension validate` and `lfx extension schema` typer subcommands. Acceptance-criteria coverage in tests/unit/extension/: - Round-trips every v0 manifest field; deferred fields rejected; multi-bundle rejected with the dedicated discriminant. - JSON Schema validates the v0 example and rejects 12 malformed manifests with distinct error paths (>= 10 required by the ticket). - Median default-validate runtime < 100ms on the basic template. - Crafted side-effect bundle: default validate does NOT execute it (canary file is never written); `--execute-imports` DOES execute it and the canary appears, while LANGFLOW_* env vars are NOT inherited by the subprocess. - Snapshot tests for every code in ERROR_CODES; a guard test verifies ERROR_CODES and the snapshot table are in lockstep so future additions cannot ship without a format branch and a snapshot. Wiring: `lfx extension` is a sub-app under the Authoring help panel so future tickets (LE-1016 init/dev, LE-1018 reload) can attach without colliding with the existing `lfx validate` (which validates flow JSON, not extensions).
tomllib is stdlib only on 3.11+, but lfx supports 3.10-3.13. Use the existing tomli runtime dependency as the 3.10 fallback (same API, so the import alias keeps the rest of the module unchanged). Fixes ModuleNotFoundError seen in CI on the 3.10 job.
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
…overy (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Addresses the file-size feedback from the LE-1015 review. The single
870-line loader.py becomes a flat package keyed off the four section
banners that already existed inline:
loader/
__init__.py # re-exports the public surface
_types.py # SLOT constants, LoadedComponent, LoadResult
_discovery.py # filesystem walk + importlib.util orchestration
_detection.py # Component subclass identification (MRO heuristic)
_orchestrator.py # load_extension, discover_inline_bundles
_plugins.py # manifest-first precedence over langflow.plugins
Largest file is now _orchestrator.py at 440 LOC (was 870); every file is
well under the 800-LOC project guideline. No behavior change: the public
import paths from lfx.extension are unchanged, all 38 loader tests still
pass. ``_canonicalize_distribution`` is now exported as
``canonicalize_distribution`` from ``loader._plugins`` (it's a stable
PEP-503 helper that downstream modules will reach for, so it loses the
private underscore).
The test suite is split to mirror the package:
tests/unit/extension/loader/
conftest.py # shared fixtures, FakeDist, autouse scrub
test_load_extension.py # @official slot, identity, failure modes
test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot
test_plugins.py # manifest-first precedence helpers
test_types.py # LoadedComponent, LoadResult, code parity
Each test file imports its own slice of the public API and pulls fixtures
from conftest, so a reader looking at one banner can read it in isolation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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The two scaffolding CLIs an Extension author types:
- `lfx extension init <target>` writes the basic single-Bundle
template (manifest with $schema, README, .gitignore, one Component
subclass + a pytest smoke test). AC #1: the generated extension
validates clean against LE-1014. AC #2: the generated test file is
a valid pytest module that exercises the component's build() method.
AC #3: any --template other than 'basic' fails with a typed
template-deferred-in-this-milestone error and a non-zero exit.
Refuses to scaffold over a non-empty target dir.
- `lfx extension dev <target>` validates the local extension, records
its absolute path in <config_dir>/extensions/dev_extensions.json,
prints reload instructions, and execs `langflow run` (or
`python -m langflow` when langflow isn't on PATH). --skip-launch
registers without launching (used by tests + external dev-server
scripts); --skip-validate lets authors register a known-broken
manifest to debug it under the loader.
Stack:
- Wave 0: error codes (extension-target-exists,
extension-target-invalid, local-extension-missing) with format
branches and snapshot tests.
- Wave 1: lfx.extension.init_template -- pure-data scaffolder, no
Typer dependency so the CLI is a thin shell over it.
- Wave 1: lfx.extension.dev_registry -- atomic JSON state file under
the langflow user-cache dir; helpers for register / list /
unregister / load_dev_extensions / dev_extension_component_paths.
- Wave 2: lfx.cli._extension_commands gains init/dev subcommands.
- Wave 2: langflow.main lifespan hook reads the dev registry after
bundle loading and extends components_path with each registered
bundle dir, so the existing palette discovery picks up dev
extensions. Missing paths surface as local-extension-missing
warnings (AC #5) without aborting startup.
Tests (84 new, 197 total in tests/unit/extension/):
- test_init_template.py: AC scenarios + identifier derivation +
deterministic file shape.
- test_dev_registry.py: register/list/unregister round-trip,
idempotent re-register refreshes timestamp, malformed state file
treated as empty, missing-path warning, recovery when path
reappears, env-var override precedence.
- test_cli.py: AC #1 init->validate, AC #3 deferred templates,
--skip-launch registers without launching, --skip-validate
short-circuits the pre-flight pass.
- test_errors.py: snapshot rows for all three new codes; the
every-known-code-has-a-snapshot test enforces parity.
LE-1018 (reload) reuses load_dev_extensions; LE-1022 (installed-pkg
discovery) shares the components_path extension pattern. AC #4 ("boots
Langflow with the extension visible in the palette within 5s") is
delivered jointly by `extension dev` (registers + execs) and the
lifespan hook (loads on startup).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Fixes the four HIGH issues + the elevated LOW from the review pass: 1. dev_extension_component_paths now forwards EVERY warning, not just local-extension-missing. Previously a duplicate-component-name (or any future warning code) was silently dropped, hiding real signal from the lifespan hook's logs. 2. Defensive emit when a LoadResult has components but source_path is None. The current loader always sets source_path, but a future hand-built LoadResult could violate that contract; we now surface a typed local-extension-missing error rather than dropping the extension silently. 3. Replaced the fragile ``min(len(parts))`` bundle-root selection with a relative-to-source-path measurement. Handles deep-vs-shallow sibling extensions correctly without depending on absolute path depth. 4. Generated README now documents the langflow/lfx prerequisite under the Develop section so authors know `pytest` requires the lfx environment, not just Python. 5. Forced LANGFLOW_LAZY_LOAD_COMPONENTS=false unconditionally in the `extension dev` exec env (was setdefault, which let a developer's global lazy-loading export silently hide their dev components from the palette and miss AC #4's 5s budget). Plus three MEDIUMs: - sys.modules cleanup in test_generated_test_file_runs_against_generated_component so a later test importing the same dotted path doesn't pick up a stale module from a deleted tmp_path. Component instantiation moved inside the try block because Component.__init__ uses inspect.getsourcefile against self.__class__'s still-live module. - Added regex-drift test that pins the init_template patterns to match manifest.py's so a schema regex change can't quietly produce invalid scaffolded manifests. - Added two new dev_registry tests covering the forward-all-warnings contract and the source_path=None defense. Tests: 201 passing (4 new); ruff check + format clean. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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The merge of feat/extension-validate brought in the LfxCompat / compat rename, but the loader test fixtures still used LangflowCompat / bundle_api and failed at the manifest layer. Update conftest.py + test_load_extension.py to the post-rename API. Strip 17 LE-XXXX ticket references from loader source files, errors.py loader-specific comments, and the four loader test docstrings, matching the convention applied to LE-1014. Descriptive prose preserved. Promote _BUNDLE_NAME_RE to BUNDLE_NAME_RE on the manifest module so the loader's orchestrator no longer reaches across modules into a private name.
Resolve conflicts caused by LE-1014 (#12952) landing on release-1.10.0: - src/lfx/src/lfx/extension/__init__.py: keep loader exports (SLOT_*, LoadedComponent, LoadResult, discover_inline_bundles, filter_plugin_entry_points, installed_extension_roots, load_extension, manifest_owning_distributions) added by LE-1015 on top of LE-1014's baseline. - src/lfx/src/lfx/extension/errors.py: keep loader-specific error codes (module-import-failed, duplicate-component-name, duplicate-inline-bundle, inline-bundle-name-invalid) and their format branches; preserve the deferred-distribution NOTE. - src/lfx/src/lfx/extension/manifest.py: keep the public BUNDLE_NAME_RE (loader/_orchestrator imports it) instead of the underscored private name from the merged LE-1014. - src/lfx/tests/unit/extension/test_errors.py: keep the four new snapshot rows so test_every_known_code_has_snapshot stays green. Verified: 148 extension tests pass; ruff check/format clean; all 22 public symbols re-export.
Resolve conflicts in: - src/backend/base/langflow/main.py: integrate dev-extension loading block from this branch with the new bundle/types/starter-projects preload gates from feat/extension-loader. Dev extensions load after the bundles gate so paths are appended to the same components_path. - src/lfx/src/lfx/extension/__init__.py: merge __all__ to expose BASIC_TEMPLATE/InitOptions (this branch) alongside BUNDLE_API_VERSION and the LangflowCompat -> LfxCompat rename from the loader branch. - src/lfx/src/lfx/cli/_extension_commands.py: keep this branch's expanded command-list docstring; drop ticket refs to match the loader branch's convention.
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After merging feat/extension-loader into this branch, two surfaces
fell out of sync with the renamed manifest schema:
- init_template generates extension.json with `lfx: {bundle_api: [1]}`,
but the validator now requires `lfx: {compat: ["1"]}` per LfxCompat.
This made `test_basic_template_validates_clean` fail with
manifest-invalid (`lfx.compat: Field required; lfx.bundle_api: Extra
inputs are not permitted`).
- test_init_template_regexes_match_manifest_schema reads
`manifest_mod._BUNDLE_NAME_RE`, but that symbol was promoted to public
`BUNDLE_NAME_RE` in c63f84a. Update the test to reference the
public name; init_template's local copy is still private since it
also covers `_EXTENSION_ID_RE`, which remains private upstream.
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…#13043) * feat(lfx): installed-package + seed-directory discovery for production install (LE-1022) Adds the read-only production install path for Modes A, B, and C of the Bundle Separation iteration. Manifest-shipping pip-installed distributions and seed-directory subdirectories are discovered at server startup and registered as Extensions at @official. * discovery.py: walks importlib.metadata.distributions() + the $LANGFLOW_SEED_DIR / /opt/langflow/bundles seed root; produces DiscoveredExtension records and typed errors for malformed manifests / configured-but-missing seed dirs. * registry.py: ExtensionRegistry service with the immutability invariant for installed and seed entries. Mutation verbs (uninstall, disable, enable, install, update_entry) all raise ExtensionImmutableError carrying the typed installed-extension-immutable / seed-directory-immutable code so the invariant is testable today; the CLI uninstall surface ships in B4. * lfx extension list: read-only inspector with text and JSON output for operators inspecting Mode B/C images. * Errors: four new typed codes (installed-extension-immutable, seed-directory-immutable, seed-directory-not-found, duplicate-extension-id) plus snapshot coverage in tests/unit/extension/test_errors.py. * Tests: 165 extension tests pass, including the LE-1022 acceptance cases -- three pip-installed wheels visible at @official, three seed bundles visible at @official, and the parametrized service-layer immutability check across every mutation verb. * Docs: docs/Deployment/deployment-extensions-production.mdx covers the Dockerfile template, k8s deployment notes, the bundle packaging convention (extension.json shipped via package-data), and troubleshooting for the typed error codes. * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (#12967) * feat(lfx): add extension manifest schema, validate CLI, and error formatter (LE-1014) Foundation for the Bundle Separation iteration. Defines what a valid extension.json looks like (Pydantic models + Draft 2020-12 JSON Schema), ships the offline `lfx extension validate` command, and ships the single `format_extension_error` function that every other extension-system module will use to render structured errors. What's in lfx.extension: - `ExtensionManifest` / `BundleRef` / `LangflowCompat` Pydantic models with `extra="forbid"` so unknown fields fail loudly. Deferred fields (`services`, `routes`, `hooks`, `starter_projects`, `userConfig`) are reserved as None-only so non-null values produce a dedicated `field-deferred-in-this-milestone` error instead of a generic schema wall. `bundles` accepts a list but rejects length > 1 with `multi-bundle-deferred-in-this-milestone` (validator-enforced; the loader re-checks at install time in LE-1015). - `schema.build_schema()` + `build_schema_json()` produce the publishable artifact at schemas.langflow.org/extension/v1.json. - `ExtensionError` typed envelope and `format_extension_error` -- one branch per discriminant. Codes are registered in `ERROR_CODES`; an `ExtensionError` constructed with an unknown code raises at construction time, preventing producers from shipping without a matching renderer. - `validate_extension` runs four passes: manifest discovery + schema, path-safety (no `..`, no absolute paths, no symlink escape), AST inspection of every `.py` (syntax, Component subclass present, build() declared, top-level `import *`, top-level I/O primitives), and an opt-in `--execute-imports` that runs each module in a subprocess with a temporary HOME / TMPDIR / LANGFLOW_CONFIG_DIR and LANGFLOW_*/LFX_* env vars stripped. - `lfx extension validate` and `lfx extension schema` typer subcommands. Acceptance-criteria coverage in tests/unit/extension/: - Round-trips every v0 manifest field; deferred fields rejected; multi-bundle rejected with the dedicated discriminant. - JSON Schema validates the v0 example and rejects 12 malformed manifests with distinct error paths (>= 10 required by the ticket). - Median default-validate runtime < 100ms on the basic template. - Crafted side-effect bundle: default validate does NOT execute it (canary file is never written); `--execute-imports` DOES execute it and the canary appears, while LANGFLOW_* env vars are NOT inherited by the subprocess. - Snapshot tests for every code in ERROR_CODES; a guard test verifies ERROR_CODES and the snapshot table are in lockstep so future additions cannot ship without a format branch and a snapshot. Wiring: `lfx extension` is a sub-app under the Authoring help panel so future tickets (LE-1016 init/dev, LE-1018 reload) can attach without colliding with the existing `lfx validate` (which validates flow JSON, not extensions). * fix(lfx): fall back to tomli on Python 3.10 in extension manifest loader tomllib is stdlib only on 3.11+, but lfx supports 3.10-3.13. Use the existing tomli runtime dependency as the 3.10 fallback (same API, so the import alias keeps the rest of the module unchanged). Fixes ModuleNotFoundError seen in CI on the 3.10 job. * Update src/lfx/tests/unit/extension/test_schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/extension/schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/cli/_extension_commands.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1015 review feedback - Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(lfx): split extension loader into a small subpackage (LE-1015) Addresses the file-size feedback from the LE-1015 review. The single 870-line loader.py becomes a flat package keyed off the four section banners that already existed inline: loader/ __init__.py # re-exports the public surface _types.py # SLOT constants, LoadedComponent, LoadResult _discovery.py # filesystem walk + importlib.util orchestration _detection.py # Component subclass identification (MRO heuristic) _orchestrator.py # load_extension, discover_inline_bundles _plugins.py # manifest-first precedence over langflow.plugins Largest file is now _orchestrator.py at 440 LOC (was 870); every file is well under the 800-LOC project guideline. No behavior change: the public import paths from lfx.extension are unchanged, all 38 loader tests still pass. ``_canonicalize_distribution`` is now exported as ``canonicalize_distribution`` from ``loader._plugins`` (it's a stable PEP-503 helper that downstream modules will reach for, so it loses the private underscore). The test suite is split to mirror the package: tests/unit/extension/loader/ conftest.py # shared fixtures, FakeDist, autouse scrub test_load_extension.py # @official slot, identity, failure modes test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot test_plugins.py # manifest-first precedence helpers test_types.py # LoadedComponent, LoadResult, code parity Each test file imports its own slice of the public API and pulls fixtures from conftest, so a reader looking at one banner can read it in isolation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix: LangflowCompat -> LfxCompat * fix: Remove references to ticket * fix: encode maxItems constraint in schema * fix: deferred fields and schema version * Fix ruff errors * fix: align loader tests with renamed manifest API and strip ticket refs The merge of feat/extension-validate brought in the LfxCompat / compat rename, but the loader test fixtures still used LangflowCompat / bundle_api and failed at the manifest layer. Update conftest.py + test_load_extension.py to the post-rename API. Strip 17 LE-XXXX ticket references from loader source files, errors.py loader-specific comments, and the four loader test docstrings, matching the convention applied to LE-1014. Descriptive prose preserved. Promote _BUNDLE_NAME_RE to BUNDLE_NAME_RE on the manifest module so the loader's orchestrator no longer reaches across modules into a private name. * refactor(lfx): clarify broad except, log malformed bundle.json, expand test docstring - Document why _discovery.import_bundle_module catches BaseException (startup-time loader, must surface bad bundles as typed errors rather than abort). - Add debug-level logging when bundle.json is malformed or non-object so a stale-cache footgun is at least observable. - Expand test_skips_re_imported_class docstring so future maintainers don't accidentally weaken the __module__-equality guard if package-style relative imports get added later. Also drops the stale duplicate-distribution claim from the PR description; that code is correctly deferred to LE-1022 along with /all integration. * feat(lfx): wire Extension System into /all, pathsep-split LANGFLOW_COMPONENTS_PATH, emit duplicate-distribution Closes the four AC gaps the previous reviewer flagged on PR #12967: 1. /all integration: get_and_cache_all_types_dict now also calls a new import_extension_components() that loads installed Extensions via load_installed_extensions, loads inline bundles via discover_inline_bundles, and builds frontend-node templates with extension/bundle/extension_version fields stamped on. Failures are logged and skipped per bundle. 2. LANGFLOW_COMPONENTS_PATH is now split on os.pathsep so multi-entry env vars (e.g. /a:/b on POSIX) produce multiple components-path entries instead of one literal non-existent path. Empty segments and missing paths are skipped. 3. duplicate-distribution is a real producer: load_installed_extensions surfaces a typed warning on the winner LoadResult when two distributions share a canonical name, naming every involved manifest path. 4. Manifest-first precedence runtime wiring: new filter_component_entry_points loads each entry-point and only skips ones that resolve to a Component subclass on a manifest-shipping distribution. plugin_routes.load_plugin_routes now applies it so non-component entry-points (route registrars) keep loading per the AC's 'unaffected' promise. Added the previously-missing AC test for same-distribution component+non-component partition. Also makes _distribution_canonical_name defensive against MagicMock test seams. * fix(lfx): register extension components under namespaced ID; promote duplicate-distribution to error Addresses the latest review of PR #12967: P1: /all integration now keys the cache inner dict by LoadedComponent.namespaced_id (ext:<bundle>:<Class>@<slot>) rather than the bare class name. Templates also carry the namespaced_id as an explicit field so consumers that look at the value (not the key) still see the canonical address. This is the form the LE-1020 migration table will rewrite legacy class-name references to. P2: load_installed_extensions now appends duplicate-distribution to result.errors instead of result.warnings, so LoadResult.ok=False when two distributions share a canonical name. The winner's components still appear in result.components so flows already pinned to them keep working; only the conflict status changes. Updated test to assert errors + ok=False; added explicit assertion that the winner's components are still present. * fix(lfx): installed-distribution discovery accepts pyproject.toml manifest form Closes the latest review finding on PR #12967: the installed-distribution scan only looked for extension.json, ignoring distributions whose manifest lives in [tool.langflow.extension] inside pyproject.toml. The AC explicitly treats both as valid manifest forms. _distribution_manifest_path now: - Returns extension.json immediately when present (preserves precedence matching load_manifest's discovery order). - Falls back to pyproject.toml only when extension.json is absent AND the pyproject's [tool.langflow.extension] section is parseable. Validation reuses load_manifest itself so the rule lives in exactly one place; a stray pyproject.toml without the section is correctly ignored. Tests cover: pyproject-only discovery, pyproject-without-section ignored, extension.json wins on collision, end-to-end pyproject load at @official, and pyproject-form manifest-first entry-point suppression. * refactor(lfx): tighten loader invariants, surface silent skips, harden tests Addresses the latest review feedback on PR #12967: Type-level invariants (_types.py): - LoadedComponent.__post_init__ enforces that @extra components must NOT carry a distribution. The reverse (@official without distribution) is permitted because load_extension is also used for dev-mode loads against a working tree before pip install. - LoadResult docstring documents the partial-success contract: components may be non-empty when errors is non-empty (some files imported, others failed). Callers branching on ok get strict success. Silent-failure fixes (_orchestrator.py + settings/base.py): - inline-path-missing: a non-existent / non-dir LANGFLOW_COMPONENTS_PATH entry now produces a typed warning per skipped path so a typo no longer yields zero diagnostics. Settings-layer skip bumped from debug to warning for the same reason. - bundle-json-invalid: a malformed or non-object bundle.json now surfaces a typed warning instead of silently rewriting the user-declared id/version to derived values under the same bundle name. - no-component-subclass gating uses a call-local counter instead of result.errors so the diagnostic stays accurate when a future caller reuses a LoadResult (multi-bundle / batch wrapper scenarios). Test hardening: - test_re_imported_class_is_skipped_via_module_filter rewritten to actually exercise the __module__-equality check via sys.modules injection; previously passed via module-import-failed (relative-import failure), which would silently weaken if package registration changes. - test_user_declared_path_order_is_preserved: AC #8's multi-path order case (distinct bundles in [path_b, path_a]) was unasserted; added. - test_inline_module_import_failure_attributes_identity: AC #10's identity-on-partial-failure was covered for @official but not @extra; added. - test_uses_real_distributions_by_default tightened to assert ep placement (in kept, not in skipped) instead of exact-list equality, so a future Langflow-shipped manifest doesn't silently flip the assertion. bumped 64 -> 175 passing extension tests; 20 backend integration tests still pass. * fix(lfx): malformed pyproject manifests surface manifest-invalid instead of disappearing Closes the latest review finding on PR #12967: a pyproject.toml with a [tool.langflow.extension] section that has missing/invalid required fields was silently dropped because _pyproject_has_extension_section ran full schema validation via load_manifest and returned False on ValueError/TypeError. That conflated 'no section' with 'section malformed'. Fix: detect section presence only. _pyproject_has_extension_section now calls _read_pyproject_extension (TOML parse + key lookup, no schema check). Behavior: - Section absent or pyproject TOML unparseable -> False (treat as regular non-manifest package). - Section present and is a table (valid OR schema-invalid) -> True. - Section present but is not a table -> True; the author intended to declare an extension and load_extension will surface the typed error. This way a typo'd pyproject Extension produces a typed manifest-invalid LoadResult with extension_id attribution, and manifest-first precedence still suppresses its legacy component entry-points -- matching the 'typed load results on success/failure' contract for the supported pyproject manifest form. Tests: two new cases pin the behavior. test_malformed_pyproject_section_ surfaces_manifest_invalid asserts a typed load-failure result with distribution attribution; the second test pins manifest-first suppression for malformed pyproject distributions. * refactor(lfx): emit inline-path-unreadable, document reload contract, trim rot Closes the remaining nits on PR #12967: - inline-path-unreadable (new typed error code): a configured LANGFLOW_COMPONENTS_PATH entry that raises OSError on iterdir (typically permission-denied) now produces a typed LoadResult error carrying str(exc) instead of silently swallowing the message. - duplicate-inline-bundle hint trimmed: removed forward promise about hard-error-in-a-later-release; same actionability, no expiration. - discover_inline_bundles docstring trimmed from three paragraphs to two sentences (per CLAUDE.md anti-multi-paragraph rule). - _distribution_manifest_path docstring trimmed to one-liner. - installed_extension_roots dropped Used-by caller-narration list; manifest_owning_distributions docstring rewritten to call out the shadow-load risk for direct callers and point to load_installed_ extensions for the typed warning surface. - _discovery.import_bundle_module: replaced 'until that lands in a later milestone' rot with a single line ('Absolute imports only between bundle modules; relative imports unsupported.') AND added the single-load-per-process contract note documenting why LE-1018 reload must scrub registry/sys.modules before re-invoking the loader. - load_extension docstring grew a 'Single-load-per-process contract' block telling direct callers not to rely on this function for refresh. Tests: new test_unreadable_path_emits_inline_path_unreadable pins the OSError -> typed-error path. --------- Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(lfx): atomic-swap Bundle reload pipeline + endpoint + CLI (LE-1018) (#12979) * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1015 review feedback - Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(lfx): split extension loader into a small subpackage (LE-1015) Addresses the file-size feedback from the LE-1015 review. The single 870-line loader.py becomes a flat package keyed off the four section banners that already existed inline: loader/ __init__.py # re-exports the public surface _types.py # SLOT constants, LoadedComponent, LoadResult _discovery.py # filesystem walk + importlib.util orchestration _detection.py # Component subclass identification (MRO heuristic) _orchestrator.py # load_extension, discover_inline_bundles _plugins.py # manifest-first precedence over langflow.plugins Largest file is now _orchestrator.py at 440 LOC (was 870); every file is well under the 800-LOC project guideline. No behavior change: the public import paths from lfx.extension are unchanged, all 38 loader tests still pass. ``_canonicalize_distribution`` is now exported as ``canonicalize_distribution`` from ``loader._plugins`` (it's a stable PEP-503 helper that downstream modules will reach for, so it loses the private underscore). The test suite is split to mirror the package: tests/unit/extension/loader/ conftest.py # shared fixtures, FakeDist, autouse scrub test_load_extension.py # @official slot, identity, failure modes test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot test_plugins.py # manifest-first precedence helpers test_types.py # LoadedComponent, LoadResult, code parity Each test file imports its own slice of the public API and pulls fixtures from conftest, so a reader looking at one banner can read it in isolation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(lfx): atomic-swap Bundle reload pipeline + endpoint + CLI (LE-1018) Five-stage reload (parallel staging load -> validate -> swap under write lock -> cleanup -> emit) for installed Bundles in Mode A. In-flight flows keep the pre-swap class via existing references; new flows pick up the post-swap class atomically; concurrent reloads on the same Bundle are rejected with reload-in-progress. Adds: * lfx/extension/registry.py -- BundleRegistry with per-bundle reload-in-progress guard and components_index.json writer * lfx/extension/reload.py -- the five-stage pipeline; events emission is stubbed (TODO LE-1017) so the swap mechanics can ship before the events service lands * loader: optional module_namespace param so Stage 1 lands in __reload_staging__.<id> instead of the live _lfx_ext.* namespace * errors: four new typed reload codes (reload-in-progress, reload-bundle-not-installed, reload-bundle-name-mismatch, reload-source-missing) with branch templates and snapshot tests * HTTP: POST /api/v1/extensions/{id}/bundles/{name}/reload, gated by the existing get_current_active_user dependency, returns 409 with a typed body for the in-progress collision case * CLI: lfx extension reload <id> [--bundle <name>] -- HTTP client against the dev server with text/json output and proper exit codes (--all is gated until LE-1019 lands the list endpoint) * tests: 16 reload-pipeline tests covering the AC matrix (rename round-trip, broken-bundle isolation, concurrent readers, in-flight flow, double-reload guard, bundle-name mismatch) plus 9 CLI client tests Mode A only. In Mode B/C bundle changes require a Docker image rebuild and the reload path is not exercised. The events emission in Stage 5 is intentionally stubbed -- the LE-1017 ticket will swap the body of _emit_bundle_reload_event in one place without touching the pipeline core. --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * [autofix.ci] apply automated fixes * feat(lfx): add `extension init` and `extension dev` CLIs (LE-1016) (#12968) * feat(lfx): add extension manifest schema, validate CLI, and error formatter (LE-1014) Foundation for the Bundle Separation iteration. Defines what a valid extension.json looks like (Pydantic models + Draft 2020-12 JSON Schema), ships the offline `lfx extension validate` command, and ships the single `format_extension_error` function that every other extension-system module will use to render structured errors. What's in lfx.extension: - `ExtensionManifest` / `BundleRef` / `LangflowCompat` Pydantic models with `extra="forbid"` so unknown fields fail loudly. Deferred fields (`services`, `routes`, `hooks`, `starter_projects`, `userConfig`) are reserved as None-only so non-null values produce a dedicated `field-deferred-in-this-milestone` error instead of a generic schema wall. `bundles` accepts a list but rejects length > 1 with `multi-bundle-deferred-in-this-milestone` (validator-enforced; the loader re-checks at install time in LE-1015). - `schema.build_schema()` + `build_schema_json()` produce the publishable artifact at schemas.langflow.org/extension/v1.json. - `ExtensionError` typed envelope and `format_extension_error` -- one branch per discriminant. Codes are registered in `ERROR_CODES`; an `ExtensionError` constructed with an unknown code raises at construction time, preventing producers from shipping without a matching renderer. - `validate_extension` runs four passes: manifest discovery + schema, path-safety (no `..`, no absolute paths, no symlink escape), AST inspection of every `.py` (syntax, Component subclass present, build() declared, top-level `import *`, top-level I/O primitives), and an opt-in `--execute-imports` that runs each module in a subprocess with a temporary HOME / TMPDIR / LANGFLOW_CONFIG_DIR and LANGFLOW_*/LFX_* env vars stripped. - `lfx extension validate` and `lfx extension schema` typer subcommands. Acceptance-criteria coverage in tests/unit/extension/: - Round-trips every v0 manifest field; deferred fields rejected; multi-bundle rejected with the dedicated discriminant. - JSON Schema validates the v0 example and rejects 12 malformed manifests with distinct error paths (>= 10 required by the ticket). - Median default-validate runtime < 100ms on the basic template. - Crafted side-effect bundle: default validate does NOT execute it (canary file is never written); `--execute-imports` DOES execute it and the canary appears, while LANGFLOW_* env vars are NOT inherited by the subprocess. - Snapshot tests for every code in ERROR_CODES; a guard test verifies ERROR_CODES and the snapshot table are in lockstep so future additions cannot ship without a format branch and a snapshot. Wiring: `lfx extension` is a sub-app under the Authoring help panel so future tickets (LE-1016 init/dev, LE-1018 reload) can attach without colliding with the existing `lfx validate` (which validates flow JSON, not extensions). * fix(lfx): fall back to tomli on Python 3.10 in extension manifest loader tomllib is stdlib only on 3.11+, but lfx supports 3.10-3.13. Use the existing tomli runtime dependency as the 3.10 fallback (same API, so the import alias keeps the rest of the module unchanged). Fixes ModuleNotFoundError seen in CI on the 3.10 job. * Update src/lfx/tests/unit/extension/test_schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/extension/schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/cli/_extension_commands.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1015 review feedback - Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(lfx): split extension loader into a small subpackage (LE-1015) Addresses the file-size feedback from the LE-1015 review. The single 870-line loader.py becomes a flat package keyed off the four section banners that already existed inline: loader/ __init__.py # re-exports the public surface _types.py # SLOT constants, LoadedComponent, LoadResult _discovery.py # filesystem walk + importlib.util orchestration _detection.py # Component subclass identification (MRO heuristic) _orchestrator.py # load_extension, discover_inline_bundles _plugins.py # manifest-first precedence over langflow.plugins Largest file is now _orchestrator.py at 440 LOC (was 870); every file is well under the 800-LOC project guideline. No behavior change: the public import paths from lfx.extension are unchanged, all 38 loader tests still pass. ``_canonicalize_distribution`` is now exported as ``canonicalize_distribution`` from ``loader._plugins`` (it's a stable PEP-503 helper that downstream modules will reach for, so it loses the private underscore). The test suite is split to mirror the package: tests/unit/extension/loader/ conftest.py # shared fixtures, FakeDist, autouse scrub test_load_extension.py # @official slot, identity, failure modes test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot test_plugins.py # manifest-first precedence helpers test_types.py # LoadedComponent, LoadResult, code parity Each test file imports its own slice of the public API and pulls fixtures from conftest, so a reader looking at one banner can read it in isolation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(lfx): add `extension init` and `extension dev` CLIs (LE-1016) The two scaffolding CLIs an Extension author types: - `lfx extension init <target>` writes the basic single-Bundle template (manifest with $schema, README, .gitignore, one Component subclass + a pytest smoke test). AC #1: the generated extension validates clean against LE-1014. AC #2: the generated test file is a valid pytest module that exercises the component's build() method. AC #3: any --template other than 'basic' fails with a typed template-deferred-in-this-milestone error and a non-zero exit. Refuses to scaffold over a non-empty target dir. - `lfx extension dev <target>` validates the local extension, records its absolute path in <config_dir>/extensions/dev_extensions.json, prints reload instructions, and execs `langflow run` (or `python -m langflow` when langflow isn't on PATH). --skip-launch registers without launching (used by tests + external dev-server scripts); --skip-validate lets authors register a known-broken manifest to debug it under the loader. Stack: - Wave 0: error codes (extension-target-exists, extension-target-invalid, local-extension-missing) with format branches and snapshot tests. - Wave 1: lfx.extension.init_template -- pure-data scaffolder, no Typer dependency so the CLI is a thin shell over it. - Wave 1: lfx.extension.dev_registry -- atomic JSON state file under the langflow user-cache dir; helpers for register / list / unregister / load_dev_extensions / dev_extension_component_paths. - Wave 2: lfx.cli._extension_commands gains init/dev subcommands. - Wave 2: langflow.main lifespan hook reads the dev registry after bundle loading and extends components_path with each registered bundle dir, so the existing palette discovery picks up dev extensions. Missing paths surface as local-extension-missing warnings (AC #5) without aborting startup. Tests (84 new, 197 total in tests/unit/extension/): - test_init_template.py: AC scenarios + identifier derivation + deterministic file shape. - test_dev_registry.py: register/list/unregister round-trip, idempotent re-register refreshes timestamp, malformed state file treated as empty, missing-path warning, recovery when path reappears, env-var override precedence. - test_cli.py: AC #1 init->validate, AC #3 deferred templates, --skip-launch registers without launching, --skip-validate short-circuits the pre-flight pass. - test_errors.py: snapshot rows for all three new codes; the every-known-code-has-a-snapshot test enforces parity. LE-1018 (reload) reuses load_dev_extensions; LE-1022 (installed-pkg discovery) shares the components_path extension pattern. AC #4 ("boots Langflow with the extension visible in the palette within 5s") is delivered jointly by `extension dev` (registers + execs) and the lifespan hook (loads on startup). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1016 review feedback Fixes the four HIGH issues + the elevated LOW from the review pass: 1. dev_extension_component_paths now forwards EVERY warning, not just local-extension-missing. Previously a duplicate-component-name (or any future warning code) was silently dropped, hiding real signal from the lifespan hook's logs. 2. Defensive emit when a LoadResult has components but source_path is None. The current loader always sets source_path, but a future hand-built LoadResult could violate that contract; we now surface a typed local-extension-missing error rather than dropping the extension silently. 3. Replaced the fragile ``min(len(parts))`` bundle-root selection with a relative-to-source-path measurement. Handles deep-vs-shallow sibling extensions correctly without depending on absolute path depth. 4. Generated README now documents the langflow/lfx prerequisite under the Develop section so authors know `pytest` requires the lfx environment, not just Python. 5. Forced LANGFLOW_LAZY_LOAD_COMPONENTS=false unconditionally in the `extension dev` exec env (was setdefault, which let a developer's global lazy-loading export silently hide their dev components from the palette and miss AC #4's 5s budget). Plus three MEDIUMs: - sys.modules cleanup in test_generated_test_file_runs_against_generated_component so a later test importing the same dotted path doesn't pick up a stale module from a deleted tmp_path. Component instantiation moved inside the try block because Component.__init__ uses inspect.getsourcefile against self.__class__'s still-live module. - Added regex-drift test that pins the init_template patterns to match manifest.py's so a schema regex change can't quietly produce invalid scaffolded manifests. - Added two new dev_registry tests covering the forward-all-warnings contract and the source_path=None defense. Tests: 201 passing (4 new); ruff check + format clean. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix: LangflowCompat -> LfxCompat * fix: Remove references to ticket * fix: encode maxItems constraint in schema * fix: deferred fields and schema version * Fix ruff errors * fix: align loader tests with renamed manifest API and strip ticket refs The merge of feat/extension-validate brought in the LfxCompat / compat rename, but the loader test fixtures still used LangflowCompat / bundle_api and failed at the manifest layer. Update conftest.py + test_load_extension.py to the post-rename API. Strip 17 LE-XXXX ticket references from loader source files, errors.py loader-specific comments, and the four loader test docstrings, matching the convention applied to LE-1014. Descriptive prose preserved. Promote _BUNDLE_NAME_RE to BUNDLE_NAME_RE on the manifest module so the loader's orchestrator no longer reaches across modules into a private name. * fix(lfx): align init template with renamed manifest API After merging feat/extension-loader into this branch, two surfaces fell out of sync with the renamed manifest schema: - init_template generates extension.json with `lfx: {bundle_api: [1]}`, but the validator now requires `lfx: {compat: ["1"]}` per LfxCompat. This made `test_basic_template_validates_clean` fail with manifest-invalid (`lfx.compat: Field required; lfx.bundle_api: Extra inputs are not permitted`). - test_init_template_regexes_match_manifest_schema reads `manifest_mod._BUNDLE_NAME_RE`, but that symbol was promoted to public `BUNDLE_NAME_RE` in c63f84a591. Update the test to reference the public name; init_template's local copy is still private since it also covers `_EXTENSION_ID_RE`, which remains private upstream. --------- Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(lfx): append-only migration table + flow deserializer rewrite hook (#13024) * feat(lfx): add extension manifest schema, validate CLI, and error formatter (LE-1014) Foundation for the Bundle Separation iteration. Defines what a valid extension.json looks like (Pydantic models + Draft 2020-12 JSON Schema), ships the offline `lfx extension validate` command, and ships the single `format_extension_error` function that every other extension-system module will use to render structured errors. What's in lfx.extension: - `ExtensionManifest` / `BundleRef` / `LangflowCompat` Pydantic models with `extra="forbid"` so unknown fields fail loudly. Deferred fields (`services`, `routes`, `hooks`, `starter_projects`, `userConfig`) are reserved as None-only so non-null values produce a dedicated `field-deferred-in-this-milestone` error instead of a generic schema wall. `bundles` accepts a list but rejects length > 1 with `multi-bundle-deferred-in-this-milestone` (validator-enforced; the loader re-checks at install time in LE-1015). - `schema.build_schema()` + `build_schema_json()` produce the publishable artifact at schemas.langflow.org/extension/v1.json. - `ExtensionError` typed envelope and `format_extension_error` -- one branch per discriminant. Codes are registered in `ERROR_CODES`; an `ExtensionError` constructed with an unknown code raises at construction time, preventing producers from shipping without a matching renderer. - `validate_extension` runs four passes: manifest discovery + schema, path-safety (no `..`, no absolute paths, no symlink escape), AST inspection of every `.py` (syntax, Component subclass present, build() declared, top-level `import *`, top-level I/O primitives), and an opt-in `--execute-imports` that runs each module in a subprocess with a temporary HOME / TMPDIR / LANGFLOW_CONFIG_DIR and LANGFLOW_*/LFX_* env vars stripped. - `lfx extension validate` and `lfx extension schema` typer subcommands. Acceptance-criteria coverage in tests/unit/extension/: - Round-trips every v0 manifest field; deferred fields rejected; multi-bundle rejected with the dedicated discriminant. - JSON Schema validates the v0 example and rejects 12 malformed manifests with distinct error paths (>= 10 required by the ticket). - Median default-validate runtime < 100ms on the basic template. - Crafted side-effect bundle: default validate does NOT execute it (canary file is never written); `--execute-imports` DOES execute it and the canary appears, while LANGFLOW_* env vars are NOT inherited by the subprocess. - Snapshot tests for every code in ERROR_CODES; a guard test verifies ERROR_CODES and the snapshot table are in lockstep so future additions cannot ship without a format branch and a snapshot. Wiring: `lfx extension` is a sub-app under the Authoring help panel so future tickets (LE-1016 init/dev, LE-1018 reload) can attach without colliding with the existing `lfx validate` (which validates flow JSON, not extensions). * fix(lfx): fall back to tomli on Python 3.10 in extension manifest loader tomllib is stdlib only on 3.11+, but lfx supports 3.10-3.13. Use the existing tomli runtime dependency as the 3.10 fallback (same API, so the import alias keeps the rest of the module unchanged). Fixes ModuleNotFoundError seen in CI on the 3.10 job. * Update src/lfx/tests/unit/extension/test_schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/extension/schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/cli/_extension_commands.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1015 review feedback - Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(lfx): split extension loader into a small subpackage (LE-1015) Addresses the file-size feedback from the LE-1015 review. The single 870-line loader.py becomes a flat package keyed off the four section banners that already existed inline: loader/ __init__.py # re-exports the public surface _types.py # SLOT constants, LoadedComponent, LoadResult _discovery.py # filesystem walk + importlib.util orchestration _detection.py # Component subclass identification (MRO heuristic) _orchestrator.py # load_extension, discover_inline_bundles _plugins.py # manifest-first precedence over langflow.plugins Largest file is now _orchestrator.py at 440 LOC (was 870); every file is well under the 800-LOC project guideline. No behavior change: the public import paths from lfx.extension are unchanged, all 38 loader tests still pass. ``_canonicalize_distribution`` is now exported as ``canonicalize_distribution`` from ``loader._plugins`` (it's a stable PEP-503 helper that downstream modules will reach for, so it loses the private underscore). The test suite is split to mirror the package: tests/unit/extension/loader/ conftest.py # shared fixtures, FakeDist, autouse scrub test_load_extension.py # @official slot, identity, failure modes test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot test_plugins.py # manifest-first precedence helpers test_types.py # LoadedComponent, LoadResult, code parity Each test file imports its own slice of the public API and pulls fixtures from conftest, so a reader looking at one banner can read it in isolation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix: LangflowCompat -> LfxCompat * fix: Remove references to ticket * fix: encode maxItems constraint in schema * fix: deferred fields and schema version * Fix ruff errors * fix: align loader tests with renamed manifest API and strip ticket refs The merge of feat/extension-validate brought in the LfxCompat / compat rename, but the loader test fixtures still used LangflowCompat / bundle_api and failed at the manifest layer. Update conftest.py + test_load_extension.py to the post-rename API. Strip 17 LE-XXXX ticket references from loader source files, errors.py loader-specific comments, and the four loader test docstrings, matching the convention applied to LE-1014. Descriptive prose preserved. Promote _BUNDLE_NAME_RE to BUNDLE_NAME_RE on the manifest module so the loader's orchestrator no longer reaches across modules into a private name. * feat(lfx): append-only migration table + flow deserializer rewrite hook Adds the migration layer of the Extension System: an append-only JSON table that maps three legacy component reference shapes (bare class name, old import path, pre-Phase-A namespaced slot) to the post-Phase-A canonical ext:<bundle>:<Class>@<slot> identifier, plus a deserializer hook that rewrites a saved-flow payload in place against that table on load. What landed: * lfx.extension.migration.schema -- Pydantic models for MigrationEntry + MigrationTable with per-entry validators (exactly one of bare/import/slot populated; canonical target shape) and table-level uniqueness check. * lfx.extension.migration.loader -- canonical in-repo path, threadsafe process-lifetime cache, typed errors on every failure mode. * lfx.extension.migration.rewrite -- node-by-node rewrite, idempotent on canonical refs, difflib-backed closest-match suggestion for unmapped references, cross-bucket ambiguity surfaces component-name-ambiguous instead of silently loading into the wrong bundle. * Wired into Graph.from_payload before validate_flow_for_current_settings so every saved-flow load goes through migration first. * scripts/migrate/check_migration_append_only.py -- CI guard that diffs the working-tree table against origin/main and rejects removals or target mutations; reordering and additions are allowed. * 34 new unit tests covering rewrite paths, loader failure modes, schema invariants, and the CI script behavior. What is deliberately deferred: * flow-migrated event emission. The events pipeline is unavailable in this iteration; the wiring point in Graph.from_payload is marked TODO and the MigrationReport already carries every field a future emitter needs. The shipped migration_table.json starts empty; entries land alongside the pilot bundle extraction in a follow-up. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(frontend): palette Bundle reload action + loading + toasts (#13025) * feat(lfx): add extension manifest schema, validate CLI, and error formatter (LE-1014) Foundation for the Bundle Separation iteration. Defines what a valid extension.json looks like (Pydantic models + Draft 2020-12 JSON Schema), ships the offline `lfx extension validate` command, and ships the single `format_extension_error` function that every other extension-system module will use to render structured errors. What's in lfx.extension: - `ExtensionManifest` / `BundleRef` / `LangflowCompat` Pydantic models with `extra="forbid"` so unknown fields fail loudly. Deferred fields (`services`, `routes`, `hooks`, `starter_projects`, `userConfig`) are reserved as None-only so non-null values produce a dedicated `field-deferred-in-this-milestone` error instead of a generic schema wall. `bundles` accepts a list but rejects length > 1 with `multi-bundle-deferred-in-this-milestone` (validator-enforced; the loader re-checks at install time in LE-1015). - `schema.build_schema()` + `build_schema_json()` produce the publishable artifact at schemas.langflow.org/extension/v1.json. - `ExtensionError` typed envelope and `format_extension_error` -- one branch per discriminant. Codes are registered in `ERROR_CODES`; an `ExtensionError` constructed with an unknown code raises at construction time, preventing producers from shipping without a matching renderer. - `validate_extension` runs four passes: manifest discovery + schema, path-safety (no `..`, no absolute paths, no symlink escape), AST inspection of every `.py` (syntax, Component subclass present, build() declared, top-level `import *`, top-level I/O primitives), and an opt-in `--execute-imports` that runs each module in a subprocess with a temporary HOME / TMPDIR / LANGFLOW_CONFIG_DIR and LANGFLOW_*/LFX_* env vars stripped. - `lfx extension validate` and `lfx extension schema` typer subcommands. Acceptance-criteria coverage in tests/unit/extension/: - Round-trips every v0 manifest field; deferred fields rejected; multi-bundle rejected with the dedicated discriminant. - JSON Schema validates the v0 example and rejects 12 malformed manifests with distinct error paths (>= 10 required by the ticket). - Median default-validate runtime < 100ms on the basic template. - Crafted side-effect bundle: default validate does NOT execute it (canary file is never written); `--execute-imports` DOES execute it and the canary appears, while LANGFLOW_* env vars are NOT inherited by the subprocess. - Snapshot tests for every code in ERROR_CODES; a guard test verifies ERROR_CODES and the snapshot table are in lockstep so future additions cannot ship without a format branch and a snapshot. Wiring: `lfx extension` is a sub-app under the Authoring help panel so future tickets (LE-1016 init/dev, LE-1018 reload) can attach without colliding with the existing `lfx validate` (which validates flow JSON, not extensions). * fix(lfx): fall back to tomli on Python 3.10 in extension manifest loader tomllib is stdlib only on 3.11+, but lfx supports 3.10-3.13. Use the existing tomli runtime dependency as the 3.10 fallback (same API, so the import alias keeps the rest of the module unchanged). Fixes ModuleNotFoundError seen in CI on the 3.10 job. * Update src/lfx/tests/unit/extension/test_schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/extension/schema.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * Update src/lfx/src/lfx/cli/_extension_commands.py Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> * feat(lfx): add single-Bundle loader and LANGFLOW_COMPONENTS_PATH discovery (LE-1015) Introduces lfx.extension.loader: the runtime that turns an Extension on disk into LoadedComponent records keyed by ext:<bundle>:<Class>@<slot>. Two paths in: - load_extension(root): one manifest, one Bundle, registered at @official. Re-checks multi-bundle at runtime (defense-in-depth vs. the schema). - discover_inline_bundles(paths): each subfolder of LANGFLOW_COMPONENTS_PATH is a Bundle at @extra. Walk order is platform-independent (sorted dirs, user-declared path order). First-wins on duplicate names; second emits duplicate-inline-bundle warning that names both paths. Manifest-first precedence helpers (installed_extension_roots, manifest_owning_distributions, filter_plugin_entry_points) let callers of the legacy langflow.plugins entry-point loader skip distributions that ship a manifest, so component entry-points are not double-registered. New typed error codes: module-import-failed, duplicate-component-name, duplicate-distribution, duplicate-inline-bundle, inline-bundle-name-invalid. Each ships with a format branch and a snapshot test. Tests cover the AC: single-bundle happy path, multi-bundle rejection, missing/empty/no-Component bundle, duplicate class names, deterministic walk order, recursive discovery, inline-bundle first-wins + dot-dir skip + bundle.json metadata, manifest-first precedence partition, PEP-503 distribution-name canonicalization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(lfx): address LE-1015 review feedback - Drop the unproduced duplicate-distribution error code; LE-1022 will add it once startup-time discovery has a place to surface it. Restores the invariant that every code in ERROR_CODES has a producer. - Clarify that intra-bundle relative imports are NOT supported in v0; only absolute references between bundle modules work in this milestone. - Use strict=False when re-resolving bundle_root in the walker; the path was already existence-checked, and a concurrent removal in the narrow window should not raise across the loader's public boundary. - Hoist the json import out of _read_inline_bundle_json's body. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(lfx): split extension loader into a small subpackage (LE-1015) Addresses the file-size feedback from the LE-1015 review. The single 870-line loader.py becomes a flat package keyed off the four section banners that already existed inline: loader/ __init__.py # re-exports the public surface _types.py # SLOT constants, LoadedComponent, LoadResult _discovery.py # filesystem walk + importlib.util orchestration _detection.py # Component subclass identification (MRO heuristic) _orchestrator.py # load_extension, discover_inline_bundles _plugins.py # manifest-first precedence over langflow.plugins Largest file is now _orchestrator.py at 440 LOC (was 870); every file is well under the 800-LOC project guideline. No behavior change: the public import paths from lfx.extension are unchanged, all 38 loader tests still pass. ``_canonicalize_distribution`` is now exported as ``canonicalize_distribution`` from ``loader._plugins`` (it's a stable PEP-503 helper that downstream modules will reach for, so it loses the private underscore). The test suite is split to mirror the package: tests/unit/extension/loader/ conftest.py # shared fixtures, FakeDist, autouse scrub test_load_extension.py # @official slot, identity, failure modes test_inline_bundles.py # LANGFLOW_COMPONENTS_PATH, @extra slot test_plugins.py # manifest-first precedence helpers test_types.py # LoadedComponent, LoadResult, code parity Each test file imports its own slice of the public API and pulls fixtures from conftest, so a reader looking at one banner can read it in isolation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(lfx): atomic-swap Bundle reload pipeline + endpoint + CLI (LE-1018) Five-stage reload (parallel staging load -> validate -> swap under write lock -> cleanup -> emit) for installed Bundles in Mode A. In-flight flows keep the pre-swap class via existing references; new flows pick up the post-swap class atomically; concurrent reloads on the same Bundle are rejected with reload-in-progress. Adds: * lfx/extension/registry.py -- BundleRegistry with per-bundle reload-in-progress guard and components_index.json writer * lfx/extension/reload.py -- the five-stage pipeline; events emission is stubbed (TODO LE-1017) so the swap mechanics can ship before the events service lands * loader: optional module_namespace param so Stage 1 lands in __reload_staging__.<id> instead of the live _lfx_ext.* namespace * errors: four new typed reload codes (reload-in-progress, reload-bundle-not-installed, reload-bundle-name-mismatch, reload-source-missing) with branch templates and snapshot tests * HTTP: POST /api/v1/extensions/{id}/bundles/{name}/reload, gated by the existing get_current_active_user dependency, returns 409 with a typed body for the in-progress collision case * CLI: lfx extension reload <id> [--bundle <name>] -- HTTP client against the dev server with text/json output and proper exit codes (--all is gated until LE-1019 lands the list endpoint) * tests: 16 reload-pipeline tests covering the AC matrix (rename round-trip, broken-bundle isolation, concurrent readers, in-flight flow, double-reload guard, bundle-name mismatch) plus 9 CLI client tests Mode A only. In Mode B/C bundle changes require a Docker image rebuild and the reload path is not exercised. The events emission in Stage 5 is intentionally stubbed -- the LE-1017 ticket will swap the body of _emit_bundle_reload_event in one place without touching the pipeline core. * feat(frontend): palette Bundle reload action + loading + toasts Adds the frontend half of the bundle reload flow. When the Bundle header is right-clicked or its overflow ("⋮") icon clicked, a Reload action fires POST /api/v1/extensions/{id}/bundles/{name}/reload and surfaces the result via the existing alert-store toast system. What landed (frontend only): * src/controllers/API/queries/extensions/ -- typed wire-format models (ReloadBundleResponse, ExtensionErrorPayload, ReloadInProgressDetail) and the useReloadBundle mutation hook. The hook unwraps the 409 `reload-in-progress` detail into a stable, parseable Error message so the UI can branch without reading status codes. * components/bundleHeaderActions.tsx -- new Select-based overflow menu next to the Bundle header chevron. Three toast paths: success (green, with components +/- delta), structural failure (red, with typed errors and inline hints), reload-in-progress (notice). Loading state swaps the kebab icon for a spinning Loader2 while the request is in flight. Renders nothing when no extension_id is on the bundle, so the static SIDEBAR_BUNDLES list is unaffected. * components/bundleItems.tsx -- wires the new actions in next to the chevron, plus a context-menu (right-click) capture that opens the same overflow trigger so keyboard / mouse / right-click all share one source of truth. * types/index.ts -- BundleItemProps.item gains an optional extension_id; took the opportunity to extract the SidebarBundle interface and tighten three pre-existing `any` types. * customization/feature-flags.ts -- ENABLE_EXTENSION_RELOAD gate, off by default until the bundle-list endpoint that populates extension_id per bundle ships. * controllers/API/helpers/constants.ts -- EXTENSIONS URL constant. * Tests: 7 component tests + 3 mutation-hook tests, all green. Total sidebar + extensions test count: 479 passing. Deferred: * Event-pipeline subscription is left as an inline TODO. The mutation response carries enough information to drive the toasts on its own today; once the events service lands the toast wiring will move to a `bundle_reloaded` / `bundle_reload_failed` listener so multi-tab and multi-worker swaps surface exactly once. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat: End to end bundle installation * fix: Review comments addressed * Update component_index.json * Update component_index.json * Update router.py * fix(docker): copy src/bundles before uv sync so workspace bundles resolve Each directory under ``src/bundles`` is a uv workspace member referenced by ``langflow-base`` (and the root project) as a path dependency. The Docker builders ran ``uv sync --no-install-project`` after copying only the top-level pyproject.toml files, so resolution failed with ``Distribution not found at: file:///app/src/bundles/<name>``. Copying the whole ``src/bundles`` tree (rather than enumerating each bundle) means a new bundle dropped under that dir does not require a Dockerfile edit. The full ``./src`` copy a few lines later produces the same final layer either way; this earlier copy just unblocks the dependency-resolution sync. Touched all builders that run a workspace-resolving uv sync: * docker/build_and_push.Dockerfile * docker/build_and_push_base.Dockerfile * docker/build_and_push_ep.Dockerfile * docker/build_and_push_with_extras.Dockerfile * docker/dev.Dockerfile (bind-mount instead of COPY) * Revert "fix(docker): copy src/bundles before uv sync so workspace bundles resolve" This reverts commit 5aa008a3cd1e1b9ae00b20b2445b506b73c05fa1. * feat: DuckDuckGo as Extension in new Bundle System (#13044) * feat: DuckDuc…
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Stacked on #12967 (LE-1015 loader).
Summary
Adds the two scaffolding CLIs an Extension author types to bootstrap and iterate locally:
lfx extension init <target>writes the basic single-Bundle template: manifest with$schema, README,.gitignore, one Component subclass, one pytest smoke test. Refuses unknown--templatevalues withtemplate-deferred-in-this-milestone.lfx extension dev <target>validates the local extension, records its absolute path in<config_dir>/extensions/dev_extensions.json, prints reload instructions (LE-1019 will add the in-palette button), and execslangflow run(orpython -m langflowif langflow isn't on PATH).A small lifespan hook in
langflow.mainreads the dev registry after the existing bundle-load step and extendscomponents_pathwith each registered bundle dir, so the existing palette discovery picks up dev extensions automatically. Vanished paths surface aslocal-extension-missingwarnings without aborting startup.Acceptance criteria
extension init my-ext && extension validate ./my-extpasses with 0 errors_runs_against_generated_componentextension init --template fullfails cleanly with a typed errorfull,service,route,multi-bundle,starter-projectsextension devboots Langflow with the new Extension visible in the palette within 5sdevregistering + the lifespan hook. The CLI side is exercised bytest_dev_skip_launch_registers_extension; the lifespan side is a 23-line addition tolangflow.main(no integration test in this PR — the existing component-discovery test suite provides that coverage once a real palette query runs).local-extension-missingon next startup_recovers(warning disappears when the dir reappears)Layout
init_template.pyinit_extension(InitOptions)dev_registry.py<config_dir>/extensions/dev_extensions.json);register/list/unregister/load_dev_extensions/dev_extension_component_paths_extension_commands.pyinit+devmounted under the existingextensionsub-applangflow/main.pyNew typed error codes
extension-target-exists,extension-target-invalid,local-extension-missing— each ships with a format branch and a snapshot row intest_errors.py. Theevery-known-code-has-a-snapshotparity test enforces drift detection.Out of scope (deliberately)
devcommand prints reload instructions; the in-palette button itself ships in LE-1019.dev_registry.load_dev_extensionsis the function LE-1018 will call when the palette button fires.extension list/ installed-pkg discovery (LE-1022): we touch the samecomponents_pathextension pattern; LE-1022 will reuse it for installed bundles + seed dirs.extension dev: explicitly deferred per the ticket. Authors edit and click Reload.full,service,route,multi-bundle,starter-projects: rejected with typed errors per AC Send chat history to the api #3; richer scaffolding is a future milestone.Test plan
tests/unit/extension/test_init_template.py— 23 tests covering AC MemoryCustom node added #1, Consuming api #2, Send chat history to the api #3, target-existence guards, identifier derivation, deterministic file shape.tests/unit/extension/test_dev_registry.py— 17 tests covering register/list/unregister round-trip, idempotent re-register + timestamp refresh, malformed state-file fallback, AC Add custom node to load from langchainhub #5 (missing path warning + recovery), env-var override precedence (LANGFLOW_DEV_EXTENSIONS_DIR>LANGFLOW_CONFIG_DIR/extensions> platformdirs default).tests/unit/extension/test_cli.py— 9 new CLI tests including AC MemoryCustom node added #1 round-trip and AC Send chat history to the api #3 deferred-template rejection;--skip-launchand--skip-validateshort-circuits.tests/unit/extension/test_errors.py— 3 new snapshot rows;test_every_known_code_has_snapshotparity test passes.langflow/main.py).🤖 Generated with Claude Code