Molecule AI Fullstack Engineer
b1d6c4476a
Line 443 of mcp.go concatenated user-controlled req.Method into the
JSON-RPC -32601 error message, allowing an agent or canvas client to
inject arbitrary strings into the response via the method field.
Fix: replace "method not found: " + req.Method with the constant
"method not found" — matching the OFFSEC-001 scrub contract applied
to the InvalidParams (line 428) and UnknownTool (line 433) paths.
Test: extend TestMCPHandler_UnknownMethod_Returns32601 with two new
assertions:
1. resp.Error.Message == "method not found"
2. defence-in-depth check that the sent method name never appears
in the response (strings.Contains guard)
Issue: #684
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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