feat(go): Add stdlib metadata to MCP call graph tool responses (PR-08)

[shivasurya]

Summary

• Add goVersion and goModuleRegistry fields to mcp.Server; wire via SetGoContext called from cmd/serve.go after InitGoStdlibLoader
• Add stdlibInfoForFQN helper: resolves a call target FQN to {package, signature, return_types} using GoStdlibLoader
• Enhance get_callees: each callee now includes is_stdlib (bool) and, when the loader is available, a stdlib_info block
• Enhance get_call_details: resolution section now includes is_stdlib and stdlib_info
• Enhance get_callers: propagates is_stdlib: true from matching call site when applicable
• Graceful degradation: all additions are no-ops when StdlibLoader is nil

Test plan

• TestSetGoContext_* — fields set correctly; nil registry allowed without panic
• TestStdlibInfoForFQN_* (8 cases) — nil registry, nil loader, no dot, non-stdlib pkg, function not found, function with signature/returns, empty returns, blank return type skipped; helper at 100% coverage
• TestToolGetCallees_* — is_stdlib present on every callee, stdlib_info added when loader available, absent for local callees and when loader is nil
• TestToolGetCallDetails_* — is_stdlib and optional stdlib_info in resolution block
• TestToolGetCallers_* — is_stdlib propagated from call site when true; absent when false
• TestHandleToolsCall_GetCallees_StdlibRoundTrip — JSON-RPC end-to-end confirms stdlib_info in response
• golangci-lint ./mcp/... → 0 issues
• go test ./mcp/... → all pass, 92.7% package coverage

🤖 Generated with Claude Code

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.37%. Comparing base (8a0e79b) to head (88fed98).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sast-engine/cmd/serve.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #556      +/-   ##
==========================================
+ Coverage   83.34%   83.37%   +0.02%     
==========================================
  Files         143      143              
  Lines       17782    17820      +38     
==========================================
+ Hits        14820    14857      +37     
- Misses       2424     2425       +1     
  Partials      538      538              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[shivasurya]

• feat(go): Replace hardcoded stdlib set with GoImportResolver struct (PR-09) #557
• feat(go): Add stdlib metadata to MCP call graph tool responses (PR-08) #556 👈 (View in Graphite)
• feat(go): Close stdlib type inference gap in GetReturnType (PR-07b) #555
• feat(go): Resolve stdlib return types in variable extraction (PR-07) #554
• feat(go): Wire stdlib loader into builder pipeline (PR-06) #553
• feat(go): Add Go version detection and stdlib loader init (PR-05) #552
• feat(go): Add Go stdlib R2 publishing pipeline (PR-04) #551
• feat(go): Add Go stdlib remote registry loader with lazy caching (PR-03) #549
• feat(go): Add Go stdlib extraction tool for registry generation (PR-02) #548
• feat(go): Add Go stdlib registry data structures and types (PR-01) #546
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[shivasurya]

Merge activity

• Feb 25, 3:17 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 25, 3:32 AM UTC: Graphite couldn't merge this pull request because a downstack PR feat(go): Close stdlib type inference gap in GetReturnType (PR-07b) #555 failed to merge.
• Feb 25, 3:54 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 25, 3:56 AM UTC: Graphite rebased this pull request as part of a merge.
• Feb 25, 3:56 AM UTC: @shivasurya merged this pull request with Graphite.

[github-actions]

Code Pathfinder Security Scan

No security issues detected.

Metric	Value
Files Scanned	4
Rules	38

---

_{Powered by Code Pathfinder}