refactor: extract shared renderStandardJSONMCPConfig helper across engine MCP modules by Copilot · Pull Request #21901 · github/gh-aw

Copilot · 2026-03-20T04:07:11Z

The same ~10-line JSON MCP config scaffolding sequence (buildMCPRendererFactory → buildMCPGatewayConfig → buildStandardJSONMCPRenderers → RenderJSONMCPConfig) was copy-pasted across claude_mcp.go, gemini_mcp.go, copilot_mcp.go, and codex_mcp.go with only minor per-engine variations.

Changes

mcp_renderer_helpers.go — new renderStandardJSONMCPConfig helper encapsulating the shared scaffolding; engine callers pass only what differs: configPath, renderer flags, custom tool callback, and optional filter
claude_mcp.go, gemini_mcp.go, codex_mcp.go — replaced repeated block with single renderStandardJSONMCPConfig(...) call
copilot_mcp.go — same, plus extracted anonymous cache-memory filter to named copilotMCPToolFilter for testability

Before → After

// Before (repeated in each engine file):
createRenderer := buildMCPRendererFactory(workflowData, "json", false, false)
return RenderJSONMCPConfig(yaml, tools, mcpTools, workflowData, JSONMCPConfigOptions{
    ConfigPath:    "/tmp/gh-aw/mcp-config/mcp-servers.json",
    GatewayConfig: buildMCPGatewayConfig(workflowData),
    Renderers: buildStandardJSONMCPRenderers(workflowData, createRenderer, false, func(...) error {
        return e.renderClaudeMCPConfigWithContext(...)
    }),
})

// After:
return renderStandardJSONMCPConfig(yaml, tools, mcpTools, workflowData,
    "/tmp/gh-aw/mcp-config/mcp-servers.json", false, false, false,
    func(...) error { return e.renderClaudeMCPConfigWithContext(...) }, nil)

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https://api.github.com/repos/actions/checkout/git/ref/tags/v5
- Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/ref/tags/v5 --jq .object.sha k/gh-aw/gh-aw/scripts/lint_errorGOINSECURE k/gh-aw/gh-aw/scripts/lint_errorGOMOD 64/bin/go **/*.json --ignore-path ../../../.pretti3303ecd19f88023c28d47289bacb7129495fe067:pkg/workflow/mcp_renderer_helpers.go /opt/hostedtoolcache/go/1.25.0/xGO111MODULE -o .go -trimpath 64/bin/go -p main -lang=go1.25 go (http block)
- Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/ref/tags/v5 --jq .object.sha 3303ecd19f88023c28d47289bacb7129495fe067:pkg/workflow/copilot_mcp.go ache/go/1.25.0/xGO111MODULE /usr/bin/git 0325691/b407/_pkgit GO111MODULE 64/bin/go git rev-�� --show-toplevel go /usr/bin/git S_Kw/nzbp3yAZeyWgit GO111MODULE 64/bin/go git (http block)
- Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/ref/tags/v5 --jq .object.sha --show-toplevel go /usr/bin/git -json GO111MODULE 64/bin/go git rev-�� --show-toplevel go /usr/bin/git -json GO111MODULE 64/bin/go git (http block)
https://api.github.com/repos/actions/checkout/git/ref/tags/v6
- Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/ref/tags/v6 --jq .object.sha 28d47289bacb7129495fe067:pkg/workflow/copilot_mcp.go GO111MODULE /opt/hostedtoolcache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE /usr/bin/sed GOINSECURE GOMOD GOMODCACHE sed (http block)
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- Triggering command: /usr/bin/gh gh api /repos/actions/checkout/git/ref/tags/v6 --jq .object.sha --show-toplevel go /usr/bin/git -json GO111MODULE 64/bin/go git rev-�� --show-toplevel go /usr/bin/git -json GO111MODULE 64/bin/go git (http block)
https://api.github.com/repos/actions/github-script/git/ref/tags/v8
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- Triggering command: /usr/bin/gh gh api /repos/actions/github-script/git/ref/tags/v8 --jq .object.sha 28d47289bacb7129495fe067:pkg/workflow/gemini_mcp.go GO111MODULE /opt/hostedtoolcache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE /opt/hostedtoolcache/uv/0.10.12/x86_64/git GOINSECURE GOMOD GOMODCACHE git (http block)
- Triggering command: /usr/bin/gh gh api /repos/actions/github-script/git/ref/tags/v8 --jq .object.sha 28d47289bacb7129495fe067:pkg/workflow/gemini_mcp.go GO111MODULE /opt/hostedtoolcache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE /home/REDACTED/work/_temp/ghcca-node/node/bin/git GOINSECURE GOMOD GOMODCACHE git (http block)
https://api.github.com/repos/actions/setup-go/git/ref/tags/v4
- Triggering command: /usr/bin/gh gh api /repos/actions/setup-go/git/ref/tags/v4 --jq .object.sha 28d47289bacb7129495fe067:pkg/workflow/gemini_mcp.go GO111MODULE /opt/hostedtoolcache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE /var/lib/waagent/Microsoft.CPlat.Core.RunCommandLinux-1.0.9/bin/run-command-extension GOINSECURE GOMOD GOMODCACHE /var/lib/waagent/Microsoft.CPlat.Core.RunCommandLinux-1.0.9/bin/run-command-extension (http block)
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- Triggering command: /usr/bin/gh gh api /repos/actions/setup-node/git/ref/tags/v4 --jq .object.sha 28d47289bacb7129495fe067:pkg/workflow/copilot_mcp.go GO111MODULE /opt/hostedtoolcache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE /usr/bin/lsof GOINSECURE GOMOD GOMODCACHE lsof (http block)
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- Triggering command: /usr/bin/gh gh api /repos/github/gh-aw-actions/git/ref/tags/v1.0.0 --jq .object.sha -json GO111MODULE ache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go env -json GO111MODULE ache/go/1.25.0/x64/bin/go GOINSECURE GOMOD GOMODCACHE go (http block)
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Copilot

Pull request overview

Refactors repeated JSON MCP config rendering scaffolding across engine modules into a shared helper to reduce duplication and centralize behavior.

Changes:

Added renderStandardJSONMCPConfig helper to encapsulate the common JSON MCP config rendering sequence.
Updated Claude, Gemini, and Codex MCP renderers to use the shared helper.
Updated Copilot MCP renderer to use the helper and extracted the cache-memory filter into copilotMCPToolFilter.
Updated smoke-codex.lock.yml safe-outputs tool schema and the add_smoked_label step inputs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pkg/workflow/mcp_renderer_helpers.go	Introduces shared JSON MCP config rendering helper used by multiple engines.
pkg/workflow/claude_mcp.go	Replaces duplicated JSON MCP config scaffolding with helper call.
pkg/workflow/gemini_mcp.go	Replaces duplicated JSON MCP config scaffolding with helper call.
pkg/workflow/copilot_mcp.go	Uses helper + extracts Copilot MCP tool filter for cache-memory exclusion.
pkg/workflow/codex_mcp.go	Uses helper for JSON gateway config generation portion.
.github/workflows/smoke-codex.lock.yml	Adjusts safe-outputs dynamic tool schema and action input wiring for smoked label step.

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Copilot · 2026-03-20T04:31:10Z

pkg/workflow/mcp_renderer_helpers.go

+func renderStandardJSONMCPConfig(
+	yaml *strings.Builder,
+	tools map[string]any,
+	mcpTools []string,
+	workflowData *WorkflowData,
+	configPath string,
+	includeCopilotFields bool,
+	inlineArgs bool,
+	webFetchIncludeTools bool,
+	renderCustom RenderCustomMCPToolConfigHandler,
+	filterTool func(string) bool,


renderStandardJSONMCPConfig takes several positional boolean parameters (includeCopilotFields, inlineArgs, webFetchIncludeTools). At the call sites this results in false, false, false argument sequences, which are easy to mis-order and hard to review. Consider replacing these booleans with a small options struct (or a single renderFlags struct) so callers can set named fields, improving readability and reducing the risk of flag mixups during future edits.

Copilot · 2026-03-20T04:31:11Z

.github/workflows/smoke-codex.lock.yml

                    }
                  },
+                  "required": [
+                    "labels"


The add_smoked_label tool schema marks only labels as required, but the workflow step later unconditionally reads and passes .number from the exported payload. If the agent omits number (allowed by this schema), fromJSON(...).number will be null/empty and action-add-labels may fail or label the wrong target. Make number required in the schema and/or default number in the step expression (e.g., fall back to the current PR/issue number).

Suggested change

"labels"

"labels",

"number"

Copilot · 2026-03-20T04:31:11Z

.github/workflows/smoke-codex.lock.yml

              {
                "description": "Add the 'smoked' label to the current pull request (can only be called once)",
                "inputSchema": {
-                  "additionalProperties": true,
+                  "additionalProperties": false,
                  "properties": {
-                    "payload": {
-                      "description": "JSON-encoded payload to pass to the action",
+                    "labels": {
+                      "description": "The labels' name to be added. Must be separated with line breaks if there're multiple labels.",
+                      "type": "string"
+                    },


This PR is described as a Go refactor to extract shared MCP rendering logic, but this workflow lock file also changes the safe-outputs dynamic tool schema and how the add_smoked_label step is invoked (switching from a single payload input to labels/number). If this is intentional, please update the PR description to explain why this workflow behavior/schema change is included; otherwise consider moving it to a separate PR to keep the refactor scoped.

Initial plan

a5935e2

Copilot AI assigned Copilot and pelikhan Mar 20, 2026

Copilot started work on behalf of pelikhan March 20, 2026 04:07 View session

Copilot AI linked an issue Mar 20, 2026 that may be closed by this pull request

Duplicate Code: JSON MCP RenderMCPConfig scaffolding across engine modules #21900

Closed

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Copilot AI and others added 2 commits March 20, 2026 04:12

chore: initial planning for MCP config deduplication

c34dc03

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com> Agent-Logs-Url: https://github.com/github/gh-aw/sessions/e085685c-e00c-4481-8dca-8f1c8449559e

refactor: extract shared renderStandardJSONMCPConfig helper to reduce…

bd3cdd4

… duplication (#issue) Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com> Agent-Logs-Url: https://github.com/github/gh-aw/sessions/e085685c-e00c-4481-8dca-8f1c8449559e

Copilot AI changed the title ~~[WIP] Remove duplicate JSON MCP RenderMCPConfig scaffolding~~ refactor: extract shared renderStandardJSONMCPConfig helper across engine MCP modules Mar 20, 2026

Copilot AI requested a review from pelikhan March 20, 2026 04:20

Copilot finished work on behalf of pelikhan March 20, 2026 04:20

pelikhan marked this pull request as ready for review March 20, 2026 04:26

Copilot AI review requested due to automatic review settings March 20, 2026 04:26

Copilot started reviewing on behalf of pelikhan March 20, 2026 04:27 View session

Copilot AI reviewed Mar 20, 2026

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pelikhan merged commit ce98106 into main Mar 20, 2026
115 checks passed

pelikhan deleted the copilot/remove-duplicate-json-mcp-config branch March 20, 2026 04:36

github-actions bot mentioned this pull request Mar 20, 2026

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refactor: extract shared renderStandardJSONMCPConfig helper across engine MCP modules#21901

refactor: extract shared renderStandardJSONMCPConfig helper across engine MCP modules#21901
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