CHW-4915 ActionIDRequired
action id is required in the URL path
Copies the raw Markdown source of this guide, for pasting into an LLM or notes.
Default message: action id is required in the URL path
HTTP status:400(client)
Problem. POST /api/actions//undo or an empty path segment.
Cause. Caller built the URL incorrectly. Fix. Include the
action id in the URL path. HTTP 400. (Renumbered twice: CHW-4904 →
CHW-4905 when the irreversible code took the 4904 slot, then
CHW-4905 → CHW-4912 → CHW-4915 as the hardening-bundle approval gate
claimed the reserved CHW-4910..4914 block. No external consumer pins
this code — the CLI and MCP compose the path themselves, so the
validation never reaches them.)