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MCP 2.5.1 — tool reliability and response token budgets

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@Foxfire1st Foxfire1st released this 09 Jun 23:46
· 50 commits to main since this release
mcp-v2.5.1
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Learn about vigilant mode.

Patch release on the 2.5.0 readiness work, fixing the two remaining classes of tool misbehavior: hangs and oversized responses.

Fixed

  • Carryover/tool hang on stdio transport (#49): subprocess children inherited the MCP server's stdin — which on stdio transport is the JSON-RPC pipe — wedging tool calls while the work completed server-side. Subprocesses now get stdin=DEVNULL unless input is piped, proven by a before/after stdio regression harness (120s hang → 3.4s). A package-wide AST hygiene test prevents reintroduction.
  • Runner image tag drift on upgrade (#50): providers/settings.py derived the CGC runner image independently and dropped the layer revision, so upgrading hosts kept a cached guard-less image. The tag now comes from the single cgc_runner_image() derivation, with a regression test.
  • Crash-looping watchers reported ready: restarting containers no longer count toward readiness.

Changed

  • Stall watchdogs instead of total-time caps for seed/clone: GrepAI index clones are killed only after 300s of zero progress (GREPAI_CLONE_STALL_SECONDS), never for size — copying index data instead of re-indexing is what makes rapid worktree provider deployment viable, and it scales with index size by design.
  • GrepAI indexing-state parity: initial-scan log markers now map to indexing/indexed instead of unknown, feeding the context-packet indexing busy list.
  • Response token budgets: bulk passthrough fields (raw status trees, rebind transcripts, watcher step results) move to temp/tool-reports/<tool>/ files referenced by an inline reportPath. Inline payloads stay compact under budget tests; reports are pruned at write time (keep last 5, max 7 days) and password-redacted.

Full changes: #51

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