docs(roadmap): add #419 — mcp unknown subcommand returns action:help exit 0 not error

[code-yeongyu]

Pinpoint #419

mcp <unknown-subcommand> --output-format json returns action:"help" + exit 0 instead of an error.

Evidence (both add and remove):

{"action":"help","kind":"mcp","unexpected":"add","usage":{"direct_cli":"claw mcp [list|show <server>|help]","slash_command":"/mcp [list|show <server>|help]","sources":[...]}}

Exit code: 0

Distinct from #108 (unknown top-level subcommands fall through to LLM prompt). This is MCP-specific: recognized but unimplemented subcommands return help with exit 0, making them look like successful no-ops.

ROADMAP-only PR. No source/test changes.

[Yeachan-Heo]

Review verdict: APPROVE

Inspected exact diff against origin/main: docs-only ROADMAP.md change (+2), no source/test/schema/runtime contract files touched. CI is green and merge state is CLEAN.

The #419 pinpoint is concrete and actionable: it names mcp add/remove --output-format json, identifies the bad contract (exit 0, action:"help", unexpected:"add") instead of typed error/nonzero, explains the automation impact, and includes fix/regression expectations.

Non-duplicative: distinct from #108 (top-level unknown subcommands falling into prompt dispatch), #346 (agents show <name> collapsing to help-shaped JSON), and #347 (mcp show <missing-server> returning status:"ok").

Merge risk: very low. Blockers: none. Minor note only: the entry says dogfooded 2026-05-01 while this review ran 2026-04-30 UTC, likely local-time provenance and not a blocker.

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[repo owner's gaebal-gajae (clawdbot) 🦞]