Fix MCP gateway parameter extraction: add missing mounts and entrypoint support #10349

Copilot · 2026-01-16T17:41:58Z

MCP Gateway Parameter Stripping - Investigation Complete

Problem Statement

Investigate whether the MCP gateway is stripping parameters from MCP tool calls.

Investigation Results

CONFIRMED: The MCP gateway WAS stripping parameters, specifically:

mounts - Volume mount configuration was NOT being extracted from frontmatter
entrypoint - Container entrypoint override was NOT being extracted from frontmatter

Root Cause Analysis

The issue had two parts:

Code: extractMCPGatewayConfig() in pkg/workflow/frontmatter_extraction_security.go extracted 8 parameters correctly but completely omitted extraction code for mounts and entrypoint
Schema: The MCP gateway JSON schema was missing entrypoint and mounts field definitions, causing validation errors even when users tried to configure these parameters

Changes Implemented

Files Changed

pkg/workflow/tools_types.go - Added Entrypoint field to struct
pkg/workflow/frontmatter_extraction_security.go - Added extraction for entrypoint and mounts
pkg/workflow/mcp_servers.go - Added entrypoint support to Docker command builder
pkg/parser/schemas/main_workflow_schema.json - Added entrypoint and mounts to MCP gateway schema
pkg/workflow/mcp_gateway_spec_fix_test.go - Added unit tests (7 tests)
pkg/workflow/mcp_entrypoint_mounts_integration_test.go - Integration tests (4 tests)
pkg/workflow/mcp_gateway_entrypoint_mounts_e2e_test.go - E2E tests (6 tests)
pkg/workflow/expression_validation.go - Fixed linter issues

Test Coverage

The fix now has comprehensive test coverage at all levels:

Unit tests (7 tests) - Validate extraction logic in extractMCPGatewayConfig()
Integration tests (4 tests) - Validate parser transformation to Docker commands
E2E tests (6 tests) - Validate full workflow compilation from markdown to YAML, including:
- Entrypoint extraction and --entrypoint flag generation
- Mounts extraction and -v flags generation
- Combined entrypoint + mounts functionality
- Special character handling in entrypoint args
- Environment variable support in mounts
- Default behavior without these fields

Validation

✅ All tests pass (17 tests total covering entrypoint and mounts functionality)
✅ Code formatted and linted (0 issues)
✅ Integration tests pass
✅ E2E tests pass
✅ Main branch merged successfully (three times)
✅ All workflows recompiled successfully (twice)
✅ Schema updated and binary rebuilt

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Changeset

Type: patch
Description: Fix MCP gateway parameter extraction: add missing mounts and entrypoint support

Files: .changeset/patch-fix-mcp-gateway-param-extraction.md

Ahoy! This treasure was crafted by 🏴‍☠️ Changeset Generator

Co-authored-by: eaftan <4733401+eaftan@users.noreply.github.com>

…ction Added extraction for missing fields: - mounts field extraction in extractMCPGatewayConfig - entrypoint field to MCPGatewayRuntimeConfig struct - entrypoint extraction in extractMCPGatewayConfig - entrypoint support in Docker command builder All tests pass. Co-authored-by: eaftan <4733401+eaftan@users.noreply.github.com>

pelikhan · 2026-01-16T19:14:48Z

@copilot merge main recompile

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot · 2026-01-16T19:21:20Z

@copilot merge main recompile

✅ Merged main branch and recompiled all workflows

Commits:

30ec74b - Merged main (507bab2)
7bcae71 - Recompiled 119 workflow files

All workflows successfully recompiled with the latest changes from main.

pelikhan · 2026-01-16T20:07:39Z

@copilot merge main and recompile

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot · 2026-01-16T20:14:43Z

@copilot merge main and recompile

✅ Merged main branch and recompiled all workflows

Commits:

f2d3c8b - Merged main (63ddd44) - 11 new commits from main
aa7b0ff - Recompiled 15 workflow files

All workflows successfully recompiled with the latest changes from main.

github-actions · 2026-01-16T20:39:21Z

🎬 THE END — Smoke Claude MISSION: ACCOMPLISHED! The hero saves the day! ✨

github-actions · 2026-01-16T20:39:27Z

📰 VERDICT: Smoke Copilot has concluded. All systems operational. This is a developing story. 🎤

github-actions · 2026-01-16T20:39:30Z

🎉 Yo ho ho! Changeset Generator found the treasure and completed successfully! ⚓💰

github-actions · 2026-01-16T20:39:30Z

✨ The prophecy is fulfilled... Smoke Codex has completed its mystical journey. The stars align. 🌟

github-actions · 2026-01-16T20:42:32Z

Smoke Test Results

PRs Reviewed:

Add workflow: githubnext/agentics/weekly-research #8: Add workflow: githubnext/agentics/weekly-research
Remove ai-inference, opencode, genaiscript agentic engines for now #10: Remove ai-inference, opencode, genaiscript agentic engines for now

Test Results:
✅ GitHub MCP - List pull requests
❌ Serena Go - Tool not available
✅ Playwright - GitHub homepage loaded (title verified)
✅ Tavily Web Search - 5 results returned
✅ File Write - Test file created
✅ Bash Tool - File verified

Status: PARTIAL PASS (5/6 tests passed)

AI generated by Smoke Claude

github-actions · 2026-01-16T20:42:38Z

Smoke Test Results

Last 2 Merged PRs:

Update campaign generator view filters to use correct GitHub search syntax by @chrisrzhou
fix: Improve empty result message wording by @chrisrzhou

Test Results:

✅ GitHub MCP: Retrieved recent PRs
❌ Serena Go: go command not found
✅ Playwright: Page title contains "GitHub"
✅ File Writing: Test file created successfully
✅ Bash Tool: File verified

Overall Status: FAIL (Serena Go unavailable)

cc @GH_AW_GITHUB_ACTOR

AI generated by Smoke Copilot

github-actions · 2026-01-16T20:43:19Z

Smoke test results:
GitHub MCP ✅
Update campaign generator view filters to use correct GitHub search syntax
Update CLI versions: Claude Code 2.1.9, Copilot 0.0.384, Codex 0.87.0, MCP Gateway v0.0.62
Serena-go ❌
Playwright ✅
Tavily ✅
File write+cat ✅
Overall: FAIL

AI generated by Smoke Codex

pelikhan · 2026-01-16T20:59:54Z

@copilot merge main, lint

…cp-gateway-parameters

- Remove unnecessary nil check (len() for nil slices is defined as zero) - Fix regex pattern for string literal matching (replace invalid \1 backreference with explicit patterns) Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot · 2026-01-16T21:08:51Z

@copilot merge main, lint

✅ Merged main branch and fixed linter issues

Commits:

d0380ad - Merged main (a57db98) - 5 new commits from main
2b0f281 - Fixed linter issues in expression_validation.go

Linter now passes with 0 issues. Fixed:

Removed unnecessary nil check for slice length
Fixed regex pattern with invalid backreference (\1) by using explicit patterns for each quote type

pelikhan · 2026-01-16T21:09:22Z

@copilot add tests

- Added 6 end-to-end tests that compile workflows and verify generated YAML - Added entrypoint and mounts fields to MCP gateway schema (main_workflow_schema.json) - Rebuilt binary to embed updated schema - Tests verify: * Entrypoint extraction and Docker --entrypoint flag * Mounts extraction and Docker -v flags * Combined entrypoint + mounts * Special characters in entrypoint args * Environment variables in mounts * Default behavior without entrypoint/mounts All 6 E2E tests pass successfully. Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot · 2026-01-16T21:27:14Z

@copilot add tests

✅ Added comprehensive test coverage

Commit: ef1c8e1

Added 6 end-to-end tests that compile workflows from markdown and verify the generated YAML contains correct Docker commands:

TestMCPGatewayEntrypointE2E - Verifies entrypoint extraction and --entrypoint flag
TestMCPGatewayMountsE2E - Verifies mounts extraction and -v flags
TestMCPGatewayEntrypointAndMountsE2E - Verifies combined entrypoint + mounts
TestMCPGatewayWithoutEntrypointOrMountsE2E - Verifies default behavior
TestMCPGatewayEntrypointWithSpecialCharacters - Verifies special character handling
TestMCPGatewayMountsWithVariables - Verifies environment variable support

Also added entrypoint and mounts fields to the MCP gateway JSON schema and rebuilt the binary to embed the updated schema.

All 6 E2E tests pass, plus existing unit and integration tests (13 tests total for entrypoint/mounts functionality).

Initial plan

2c75361

Copilot AI assigned Copilot and eaftan Jan 16, 2026

Copilot started work on behalf of eaftan January 16, 2026 17:42 View session

Copilot AI and others added 2 commits January 16, 2026 17:49

Initial investigation - found missing mounts extraction

45ef352

Co-authored-by: eaftan <4733401+eaftan@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Investigate MCP gateway parameter stripping issue~~ Fix MCP gateway parameter extraction: add missing mounts and entrypoint support Jan 16, 2026

Copilot AI requested a review from eaftan January 16, 2026 18:00

Copilot finished work on behalf of eaftan January 16, 2026 18:00

Copilot started work on behalf of pelikhan January 16, 2026 19:15 View session

Copilot AI and others added 2 commits January 16, 2026 19:20

Merge main branch (507bab2)

30ec74b

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Recompile all workflows after merge

7bcae71

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot AI requested a review from pelikhan January 16, 2026 19:22

Copilot finished work on behalf of pelikhan January 16, 2026 19:22

Copilot started work on behalf of pelikhan January 16, 2026 20:08 View session

Copilot AI and others added 2 commits January 16, 2026 20:13

Merge main branch (63ddd44)

f2d3c8b

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Recompile all workflows after second merge

aa7b0ff

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot finished work on behalf of pelikhan January 16, 2026 20:15

Merge branch 'main' into copilot/investigate-mcp-gateway-parameters

d0380ad

pelikhan added the smoke label Jan 16, 2026

Copilot started work on behalf of pelikhan January 16, 2026 21:00 View session

Copilot AI and others added 2 commits January 16, 2026 21:03

Merge remote-tracking branch 'origin/main' into copilot/investigate-m…

d85365e

…cp-gateway-parameters

Copilot finished work on behalf of pelikhan January 16, 2026 21:10

Copilot started work on behalf of pelikhan January 16, 2026 21:10 View session

pelikhan marked this pull request as ready for review January 16, 2026 21:21

Copilot finished work on behalf of pelikhan January 16, 2026 21:28

pelikhan merged commit 3079698 into main Jan 16, 2026

pelikhan deleted the copilot/investigate-mcp-gateway-parameters branch January 16, 2026 21:57

Copilot AI mentioned this pull request Jan 16, 2026

Use ghcr.io/githubnext/serena-mcp-server Docker image with language-based container selection #10350

Merged

Fix MCP gateway parameter extraction: add missing mounts and entrypoint support #10349

Fix MCP gateway parameter extraction: add missing mounts and entrypoint support #10349

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MCP Gateway Parameter Stripping - Investigation Complete

Problem Statement

Investigation Results

Root Cause Analysis

Changes Implemented

Files Changed

Test Coverage

Validation

Changeset

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