docs: live MCP verification + honest dogfood acceptance (closes #230)

[aram-devdocs]

Adds a live mcp__plumb__lint_url JSON example to docs/src/mcp/claude.md (captured from a real Claude Code session). Revises docs/runbooks/phase-6-spec.yaml acceptance from '0 violations clean' to 'exit 0 or 3 + deterministic across 3 runs', which is the honest V0 bar — full 0-violation dogfood is tracked as a post-V0 follow-up. Closes #230.

[github-actions]

I have all the information I need. Here is the review.

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PR #237 — docs: live MCP verification + honest dogfood acceptance

Scope

Docs-only. Two files:

• docs/src/mcp/claude.md — adds a ## Verified locally section with a live JSON example.
• docs/runbooks/phase-6-spec.yaml — relaxes the acceptance criterion from "0 violations" to "exit 0 or 3 + deterministic across 3 runs".

No Rust code changed. Checks 1–4 (determinism, layering, error handling, test coverage) do not apply.

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1. Runbook changes — phase-6-spec.yaml

The wording is accurate. Exit code semantics are confirmed at crates/plumb-cli/src/commands/lint.rs:360–365:

has_error  → ExitCode::from(1)
warnings   → ExitCode::from(3)
clean      → ExitCode::SUCCESS (0)

"Exit 0 or 3" correctly means "no Error-severity violations." The change is honest and well-motivated. ✓

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2. ## Verified locally section — docs/src/mcp/claude.md

Finding A — counts field order does not match actual server output (warning)

docs/src/mcp/claude.md:85

The doc shows:

"counts": { "error": 0, "warning": 1, "info": 0, "total": 1 }

The actual insertion order in counts_json (crates/plumb-format/src/lib.rs:598–607) is alphabetical — serde_json::Map is insertion-ordered, and the code inserts error, info, total, warning. The real server output would be:

"counts": { "error": 0, "info": 0, "total": 1, "warning": 1 }

JSON is semantically unordered, so this is not a correctness bug. But the PR description says "the response below is the actual JSON returned by the server", and the field order demonstrably differs. A reader trying to reproduce this output would see a mismatch. Correct the order or drop the "actual JSON" claim.

Finding B — lowercase product name (warning)

docs/src/mcp/claude.md:57

The plumb MCP server has been wired into a live Claude Code session.

Should be "The Plumb MCP server…". Every other occurrence in this file uses the capital-P form.

Finding C — description conflates structuredContent with the full tool response (advisory)

docs/src/mcp/claude.md:59

The section says "the actual JSON returned by the server" but only shows the structuredContent object (violations + counts). The real tool result also carries content[].text (the compact text summary). The example is useful as-is, but the framing is slightly misleading. Consider: "the structuredContent block returned by the server".

Finding D — humanizer pass (clean)

No banned phrases (dive, leverage, seamless, comprehensive, delve, etc.) found in the added text. ✓

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Punch list

#	File	Line	Issue	Severity
1	docs/src/mcp/claude.md	85	counts field order { error, warning, info, total } does not match actual server output { error, info, total, warning } from counts_json. PR claims this is the actual response.	Warning
2	docs/src/mcp/claude.md	57	"plumb MCP server" → "Plumb MCP server" (capitalization)	Warning
3	docs/src/mcp/claude.md	59	"actual JSON returned by the server" should say "structuredContent block" to be precise	Advisory

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Verdict: REQUEST_CHANGES