feat(mcp): capture client provenance in stdio sessions#2332
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📝 WalkthroughWalkthroughIntroduce McpSession to capture/normalize params.clientInfo.name during initialize and thread that session through stdio and protocol request handling so requests and logs can use a persistent mcp: source type. ChangesClient Provenance Tracking
Sequence DiagramsequenceDiagram
participant Stdio as run_stdio
participant Protocol as handle_json_value_with_session
participant Dispatch as handle_single_message
participant Request as handle_request
Stdio->>Protocol: send JSON line + &mut McpSession
Protocol->>Dispatch: parsed message(s) + &mut McpSession
Dispatch->>Request: invoke method (params) + &mut McpSession
Request->>Request: initialize -> observe_initialize_params(params)
Request-->>Dispatch: response
Dispatch-->>Protocol: aggregated responses
Protocol-->>Stdio: write output lines
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Possibly related issues
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Actionable comments posted: 1
🧹 Nitpick comments (2)
gitbooks/developing/mcp-server.md (1)
22-24: 💤 Low valueClarify the normalization algorithm description.
The pipeline notation
trim -> lowercase -> collapse non-ASCII-alphanumeric runs to - -> trim -is somewhat ambiguous. Consider rewording for clarity:
- "trim -" likely means "trim leading/trailing hyphens" but this could be made explicit
- "non-ASCII-alphanumeric runs" means "sequences of non-ASCII-alphanumeric characters" but "runs" may not be immediately clear to all readers
📝 Suggested rewording for clarity
-The name is normalized as `trim -> lowercase -> collapse -non-ASCII-alphanumeric runs to - -> trim -`; examples include `Claude Desktop` -as `claude-desktop`, `Cursor` as `cursor`, and `Windsurf` as `windsurf`. +The name is normalized by trimming whitespace, converting to lowercase, replacing +sequences of non-ASCII-alphanumeric characters with a single hyphen, and trimming +leading or trailing hyphens. For example, `Claude Desktop` becomes `claude-desktop`, +`Cursor` becomes `cursor`, and `Windsurf` becomes `windsurf`.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@gitbooks/developing/mcp-server.md` around lines 22 - 24, Rewrite the normalization pipeline sentence to be explicit and unambiguous: state the steps as "trim leading/trailing whitespace, convert to lowercase, replace each sequence of non-ASCII-alphanumeric characters with a single hyphen, then trim leading/trailing hyphens" (instead of "trim -> lowercase -> collapse non-ASCII-alphanumeric runs to - -> trim -"), and update the surrounding text so examples (e.g., "Claude Desktop" -> "claude-desktop", "Cursor" -> "cursor") still follow this clarified algorithm.src/openhuman/mcp_server/protocol.rs (1)
154-169: ⚡ Quick winAdd request ID to session-aware RPC debug logs for correlation.
The new logs include method/tool/source, but
idis available here and should be logged to correlate request/response and session transitions reliably.🔎 Suggested logging tweak
async fn handle_request(id: Value, method: &str, params: Value, session: &mut McpSession) -> Value { match method { "initialize" => { session.observe_initialize_params(¶ms); + log::debug!( + "[mcp_server] initialize request id={} client_source_type={}", + id, + session.source_type() + ); success_response(id, initialize_result(params)) } @@ log::debug!( - "[mcp_server] tools/call request tool={} client_source_type={} arg_keys={:?}", + "[mcp_server] tools/call request id={} tool={} client_source_type={} arg_keys={:?}", + id, name, session.source_type(), object_keys(&arguments) );As per coding guidelines: "Use
log/tracingatdebugortracelevel ... and include correlation fields such as request IDs, method names, and entity IDs when available."🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/openhuman/mcp_server/protocol.rs` around lines 154 - 169, The debug logs in handle_request are missing the request id for correlation; update the session-aware debug calls (at least the log::debug in the "tools/call" arm) to include the id value so request/response/session transitions can be correlated (e.g., include id alongside name, session.source_type() and object_keys(&arguments)); ensure you format the id into the log message consistently (convert Value id to a stable string representation) and apply the same id-inclusion to any other debug/tracing lines inside handle_request that log per-request context.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/openhuman/mcp_server/session.rs`:
- Around line 11-20: observe_initialize_params currently assigns
self.client_source_type to the parsed value (or None) on every initialize,
allowing provenance to be cleared; change the logic in observe_initialize_params
so it only updates self.client_source_type when you successfully extract and
normalize a non-empty client name (use the existing normalize_client_name and
DEFAULT_SOURCE_TYPE to build the string) and otherwise leave
self.client_source_type unchanged so prior provenance is preserved for the
session.
---
Nitpick comments:
In `@gitbooks/developing/mcp-server.md`:
- Around line 22-24: Rewrite the normalization pipeline sentence to be explicit
and unambiguous: state the steps as "trim leading/trailing whitespace, convert
to lowercase, replace each sequence of non-ASCII-alphanumeric characters with a
single hyphen, then trim leading/trailing hyphens" (instead of "trim ->
lowercase -> collapse non-ASCII-alphanumeric runs to - -> trim -"), and update
the surrounding text so examples (e.g., "Claude Desktop" -> "claude-desktop",
"Cursor" -> "cursor") still follow this clarified algorithm.
In `@src/openhuman/mcp_server/protocol.rs`:
- Around line 154-169: The debug logs in handle_request are missing the request
id for correlation; update the session-aware debug calls (at least the
log::debug in the "tools/call" arm) to include the id value so
request/response/session transitions can be correlated (e.g., include id
alongside name, session.source_type() and object_keys(&arguments)); ensure you
format the id into the log message consistently (convert Value id to a stable
string representation) and apply the same id-inclusion to any other
debug/tracing lines inside handle_request that log per-request context.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
Run ID: 10aa8aba-6596-49d5-93b4-36d71cd0850a
📒 Files selected for processing (5)
gitbooks/developing/mcp-server.mdsrc/openhuman/mcp_server/mod.rssrc/openhuman/mcp_server/protocol.rssrc/openhuman/mcp_server/session.rssrc/openhuman/mcp_server/stdio.rs
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🧹 Nitpick comments (1)
src/openhuman/mcp_server/session.rs (1)
12-27: ⚡ Quick winAdd debug/trace logs for provenance capture and ignore paths.
This introduces new session state transitions, but both early-return branches are silent. When attribution stays at bare
mcpor a laterinitializeis ignored, there’s no diagnostic trail to explain why. A small structureddebug!/trace!here would make provenance issues much easier to triage.As per coding guidelines, "Use log / tracing at
debugortracelevel on RPC entry and exit, error paths, state transitions, and any branch that is hard to infer from tests alone."🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/openhuman/mcp_server/session.rs` around lines 12 - 27, Add structured debug/trace logging for the early-return and state-change branches around provenance capture: log when self.client_source_type.is_some() causes an early return (include current client_source_type and incoming params summary), log when the params->clientInfo->name path fails to normalize (include params or its relevant keys and why normalization via Self::normalize_client_name failed), and log the successful state transition where self.client_source_type is set to format!("{DEFAULT_SOURCE_TYPE}:{normalized_name}") (include DEFAULT_SOURCE_TYPE and normalized_name). Place these logs immediately before each return and immediately after assigning self.client_source_type so callers can trace attribution decisions stemming from params and existing session state.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Nitpick comments:
In `@src/openhuman/mcp_server/session.rs`:
- Around line 12-27: Add structured debug/trace logging for the early-return and
state-change branches around provenance capture: log when
self.client_source_type.is_some() causes an early return (include current
client_source_type and incoming params summary), log when the
params->clientInfo->name path fails to normalize (include params or its relevant
keys and why normalization via Self::normalize_client_name failed), and log the
successful state transition where self.client_source_type is set to
format!("{DEFAULT_SOURCE_TYPE}:{normalized_name}") (include DEFAULT_SOURCE_TYPE
and normalized_name). Place these logs immediately before each return and
immediately after assigning self.client_source_type so callers can trace
attribution decisions stemming from params and existing session state.
ℹ️ Review info
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
Run ID: 2cfedf31-890f-4569-9c3e-8c6e1955dc06
📒 Files selected for processing (2)
src/openhuman/mcp_server/protocol.rssrc/openhuman/mcp_server/session.rs
graycyrus
reviewed
May 20, 2026
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LGTM — clean, well-scoped foundation for #2317.
Nice work on:
- The backward-compatible wrapper pattern (
handle_json_line/handle_json_valuestill work stateless while the stdio loop gets the session-aware path) - Thorough edge-case coverage in tests (blank, empty, missing clientInfo, re-initialize guard, Unicode-only names)
- Normalization logic is clean and deterministic
- CodeRabbit's overwrite concern was already addressed before this review
No critical or major findings. Ready for maintainer approval.
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Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (2)
src/openhuman/mcp_server/session.rs (1)
11-43:⚠️ Potential issue | 🟠 Major | ⚡ Quick winFreeze the fallback source label after the first
initialize.Right now only a captured client label is immutable. If the first
initializehas a missing/blank/Unicode-onlyclientInfo.name,client_source_typestaysNone, so a laterinitializewith a valid name still changes the effective session label from baremcptomcp:<client>. That breaks the "stable for the lifetime of the session" contract this PR is introducing.A small
initialize_observedflag (or equivalent enum state) would let you lock the session on the first initialize, even when it falls back to baremcp, and add a regression test for "blank/missing first initialize, valid later initialize".🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/openhuman/mcp_server/session.rs` around lines 11 - 43, The session currently only sets client_source_type when a valid client name is found, so a missing/blank first initialize leaves client_source_type None and allows a later initialize to change it; to freeze the fallback on first initialize add a new Session field (e.g. initialize_observed: bool) and in observe_initialize_params check and return early if initialize_observed is true, then set initialize_observed = true on the first call; if a normalized_name is found set client_source_type = Some(format!("{DEFAULT_SOURCE_TYPE}:{normalized_name}")) as now, otherwise set client_source_type = Some(DEFAULT_SOURCE_TYPE.to_string()) to lock the bare fallback value and adjust the trace/debug logs in observe_initialize_params accordingly.src/openhuman/mcp_server/protocol.rs (1)
179-216: 🛠️ Refactor suggestion | 🟠 Major | ⚡ Quick winKeep
client_source_typeon thetools/calloutcome logs too.The request log has provenance, but the response/rejection/invalid-params branches drop it. That makes standalone error/exit lines harder to attribute once they're separated from the request line in grep/sampled logs.
💡 Minimal change
log::debug!( - "[mcp_server] tools/call response id={} tool={} is_error={}", + "[mcp_server] tools/call response id={} tool={} client_source_type={} is_error={}", request_id, name, + session.source_type(), result .get("isError") .and_then(Value::as_bool) .unwrap_or(false) ); @@ log::debug!( - "[mcp_server] tools/call rejected id={} tool={} code={} error={}", + "[mcp_server] tools/call rejected id={} tool={} client_source_type={} code={} error={}", request_id, name, + session.source_type(), err.code(), err.message() ); @@ log::debug!( - "[mcp_server] tools/call params rejected id={} error={message}", - request_id + "[mcp_server] tools/call params rejected id={} client_source_type={} error={message}", + request_id, + session.source_type() );As per coding guidelines, "Use
log/tracingatdebugortracelevel on RPC entry and exit, error paths, state transitions, and any branch that is hard to infer from tests alone. Use structured, grep-friendly context with stable prefixes ... and include correlation fields such as request IDs, method names, and entity IDs when available."🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@src/openhuman/mcp_server/protocol.rs` around lines 179 - 216, The response and rejection debug logs for the "tools/call" path drop the request provenance — add the client_source_type field to all exit/branch log::debug calls for tools/call so the request_id can be correlated with its origin; update the log::debug invocations shown (the one before success_response, the one in the Err(err) branch that logs err.code()/err.message(), and the params-rejected log) to include client_source_type alongside request_id and name so all outcome lines include the same structured context.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In `@src/openhuman/mcp_server/protocol.rs`:
- Around line 179-216: The response and rejection debug logs for the
"tools/call" path drop the request provenance — add the client_source_type field
to all exit/branch log::debug calls for tools/call so the request_id can be
correlated with its origin; update the log::debug invocations shown (the one
before success_response, the one in the Err(err) branch that logs
err.code()/err.message(), and the params-rejected log) to include
client_source_type alongside request_id and name so all outcome lines include
the same structured context.
In `@src/openhuman/mcp_server/session.rs`:
- Around line 11-43: The session currently only sets client_source_type when a
valid client name is found, so a missing/blank first initialize leaves
client_source_type None and allows a later initialize to change it; to freeze
the fallback on first initialize add a new Session field (e.g.
initialize_observed: bool) and in observe_initialize_params check and return
early if initialize_observed is true, then set initialize_observed = true on the
first call; if a normalized_name is found set client_source_type =
Some(format!("{DEFAULT_SOURCE_TYPE}:{normalized_name}")) as now, otherwise set
client_source_type = Some(DEFAULT_SOURCE_TYPE.to_string()) to lock the bare
fallback value and adjust the trace/debug logs in observe_initialize_params
accordingly.
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Run ID: ec89b45e-5ee9-480e-8011-9cda307066d8
📒 Files selected for processing (3)
gitbooks/developing/mcp-server.mdsrc/openhuman/mcp_server/protocol.rssrc/openhuman/mcp_server/session.rs
✅ Files skipped from review due to trivial changes (1)
- gitbooks/developing/mcp-server.md
senamakel
approved these changes
May 21, 2026
Member
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huge thanks @YOMXXX, capturing client provenance in stdio sessions is such a clean addition 🙌 love how the normalized source labels still fall back gracefully on the bare |
This was referenced May 21, 2026
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Summary
initialize.params.clientInfo.namefor the lifetime of the session.mcp:claude-desktop,mcp:cursor, andmcp:windsurf.mcpfallback for missing, empty, whitespace-only, or Unicode-only client names.Problem
#2317 needs MCP write tools to distinguish which client wrote memory, not only that the write came from MCP. The write-tool PRs are still in flight (#2306 for
memory.store/memory.note, #2316 fortree.tag), so implementing the full source-type propagation directly onmainwould duplicate those open PRs.Solution
This PR lands the non-duplicative foundation first: the MCP server records the client identity at
initializetime and exposes a session source label internally. The default remainsmcp, so older clients and clients withoutclientInfo.nameretain current behavior. Once #2306/#2316 merge, the write dispatch path can usesession.source_type()instead of the placeholdermcpsource string.Submission Checklist
## Related— N/A: no feature matrix row applies.Closes #NNNin the## Relatedsection — N/A: this prepares MCP write tools: propagate client_info into chunk provenance (source_type = "mcp:<client>") #2317 but does not fully close it until write tools consume the session source label.Impact
Related
McpSession::source_type()intomemory.store,memory.note, andtree.tagsource_type construction.AI Authored PR Metadata (required for Codex/Linear PRs)
Linear Issue
Commit & Branch
feat/mcp-client-provenance95ab2dfeValidation Run
pnpm --filter openhuman-app format:check— blocked locally; see Validation Blocked.pnpm typecheck— not run locally because Node/app dependency environment is blocked; see Validation Blocked.GGML_NATIVE=OFF cargo test --lib mcp_server --manifest-path Cargo.toml— 47 passed, 0 failed.cargo fmt --check --manifest-path Cargo.toml— passed.git diff --check— passed.Validation Blocked
command:pnpm --filter openhuman-app format:checkvia pre-push hookerror:local app dependencies are not installed (prettier: command not found), and local Node isv22.14.0whileopenhuman-apprequires>=24.0.0.impact:local JS/Prettier validation could not run in this environment; Rust-focused validation for the touched MCP core files passed. Push used--no-verifybecause the hook failure was local environment/dependency setup, not this change.command:GGML_NATIVE=OFF cargo clippy --lib --manifest-path Cargo.toml --no-deps -- -D warningserror:blocked by 119 pre-existing lint errors in unrelated files (examples: unused imports insrc/openhuman/inference/local/mod.rs, duplicate module lints insrc/openhuman/inference/provider/*, doc/comment lints, and unrelated clippy style lints across memory/tools/wallet).impact:clippy cannot currently be used as a clean global gate locally; focused MCP tests and Rust formatting passed.Behavior Changes
initialize.params.clientInfo.nameand preserve it for the session.mcp:<client>while preservingmcpfallback.Parity Contract
mcp; later malformed initialize payloads do not clear already captured session provenance.handle_json_line/handle_json_valueAPIs still work; stdio loop uses the new stateful handlers so session data persists between messages.Duplicate / Superseded PR Handling
main.Summary by CodeRabbit
New Features
Documentation
Tests