[cli-tools-test] MCP compile: failed dry-run gate hides the underlying compiler warning #67893

Problem Description

The MCP compile tool can return a failed dry-run gate with only compiler reported warnings; review the complete compiler diagnostics. The actual warning is absent from the response, so an MCP-only caller cannot identify or resolve the failure.

Observed on three representative workflows: codex-github-remote-mcp-test, archie, and agent-job-health. Each workflow entry reports valid: true with empty errors and warnings, while the batch compiler result and dry-run gate fail.

Steps to Reproduce

1. In github/gh-aw, invoke the agentic-workflows MCP compile tool with:

{"workflows":["codex-github-remote-mcp-test"],"dry_run":true,"strict":true,"max_tokens":2000}

2. Inspect the workflow result, the batch compiler result, and the dry-run gate.
3. Try to locate the warning responsible for the failed gate in the returned response.

CLI transport used: agenticworkflows compile with the JSON above; no direct gh aw invocation.

Expected Behavior

The failed gate includes the concrete compiler warning text, preferably with workflow attribution and source location, or a supported diagnostics artifact reference. Preserve the failing gate; expose its reason.

Actual Behavior

All three responses contain only the generic compiler-warning message, without the underlying diagnostic or a diagnostics-file reference. Shellcheck reports passed and model inventory is available. No specific failing scanner or model diagnostic explains the warning. The deprecated max_tokens parameter is documented in source as ignored, so this is not intentional response truncation.

Impact

• Severity: Medium — failed validation is not actionable through the MCP interface.
• Frequency: Observed for all three sampled workflows in this session.
• Workaround: None verified through the MCP interface.
• Each targeted dry-run compile took approximately 42 seconds under concurrent execution; this is an observation, not an isolated performance benchmark.

Environment

• Repository: github/gh-aw
• Date: 2026-10-12
• Testing run: §38208175983
• CLI version: not exposed by status; tested the configured MCP server and current checkout.
• Duplicate search was attempted, but candidate issue contents were withheld by integrity policy. Existing duplicate status could not be established.

[
  {"workflow":"codex-github-remote-mcp-test.md","valid":true,"errors":[],"warnings":[]},
  {"scope":"batch","workflow":"compiler","valid":false,"errors":[{"type":"compiler_warning","message":"compiler reported warnings; review the complete compiler diagnostics"}],"warnings":[]},
  {"scope":"batch","workflow":"dry-run","valid":false,"errors":[],"warnings":[],"dry_run":{"gate":"failed","compile_only":true,"execution_authorized":false}}
]

Next Action

Include concrete aggregate compiler diagnostics in MCP JSON responses and cover the case where nonempty stdout accompanies a warning-induced failed gate.

References:

• §38208175983

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• expires on Oct 18, 2026, 9:38 PM UTC-08:00