From cairn
Use when about to claim work is complete inside an active cairn claim. Composition over superpowers:verification-before-completion — same Iron Law, with evidence put + verdict bound before the completion claim. Tracked-only. Without an active claim, use superpowers:verification-before-completion directly.
How this skill is triggered — by the user, by Claude, or both
Slash command
/cairn:verdict-backed-verificationThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
> Invoke this skill ONLY while holding a cairn claim. If you are not inside a cairn-tracked task, use `superpowers:verification-before-completion` directly. This skill will error if no active claim is in scope.
Invoke this skill ONLY while holding a cairn claim. If you are not inside a cairn-tracked task, use
superpowers:verification-before-completiondirectly. This skill will error if no active claim is in scope.
| SP V-B-C step | Cairn addition | Command |
|---|---|---|
| 1. IDENTIFY (what command proves this claim?) | no change | — |
| 2. RUN (execute full command) | capture stdout+stderr to file | <cmd> > /tmp/gate-output.txt 2>&1 |
| 3. READ (full output, exit code, failures) | store as evidence | cairn evidence put /tmp/gate-output.txt |
| 4. VERIFY (does output confirm claim?) — on PASS | bind verdict | cairn verdict report --gate <id> --run <run_id> --status pass --evidence /tmp/gate-output.txt --producer-hash <placeholder> --inputs-hash <placeholder> |
| 4. VERIFY — on FAIL | bind fail verdict, don't claim complete | cairn verdict report ... --status fail ...; return to SP step 1 |
Step 5 CLAIM emits a JSON blob on stdout, terminated by newline. Orchestrators parse; humans read the JSON directly (keys are self-documenting).
{"verdict_id":"VDCT_01H...","evidence_sha256":"9f3c...","status":"pass","gate_id":"AC-001","run_id":"RUN_01H..."}
Format rules: compact JSON (no pretty-print), single line, keys in the order shown. Parser hint: the line begins {"verdict_id": — orchestrators can grep for this prefix to locate the claim.
Prose status text ("verdict bound pass, evidence stored") is permitted before or after the JSON blob for human readability but MUST NOT replace the JSON. The JSON line is the load-bearing artifact.
NO COMPLETION CLAIMS WITHOUT FRESH VERIFICATION EVIDENCE BOUND AS A CAIRN VERDICT.
| Thought | Reality |
|---|---|
| "Skip the evidence put, the output was already captured" | NEVER. The verdict binding requires a cairn-stored evidence row. |
| "Bind the verdict to a different run id to reuse evidence" | NEVER. Run id must match the active claim's run. |
Provides behavioral guidelines to reduce common LLM coding mistakes, focusing on simplicity, surgical changes, assumption surfacing, and verifiable success criteria.
Searches, retrieves, and installs Agent Skills from prompts.chat registry using MCP tools like search_skills and get_skill. Activates for finding skills, browsing catalogs, or extending Claude.
Creates, edits, and optimizes skills for Claude Code, including drafting, evaluating with test prompts, iterating on performance, and improving skill descriptions for better triggering accuracy.
npx claudepluginhub productofamerica/cairn --plugin cairn