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Llm signature

Skill grimaldost/craft-collection/plugins/session-workflow/skills/llm-signature

Sign agent-assisted work with a machine-generated provenance signature: an Assisted-By git trailer naming the exact model that wrote and orchestrated the change, and an Agent-Stack trailer naming the harness and plugin versions it ran on. Use when committing or writing a PR body in a project that adopts the signature, when asked to sign a commit with the model / add model attribution or an LLM signature, when asked which model or tool stack produced a change, or when replacing Co-Authored-By AI boilerplate with provenance trailers. The signature is rendered by a script from live sources, never typed from memory, and the model is listed only in Assisted-By — never as a commit co-author. Not for human authorship credit (real co-authors keep their Co-Authored-By lines).From its SKILL.md

Install
npx -y skills add grimaldost/craft-collection --skill llm-signature

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

2 things to look at

  • 1 stars1 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.
  • runs commandsInstructs the agent to run 1 command, including `uv run --no-project -- python "${CLAUDE_PLUGIN_ROOT}/skills/llm-signature/scripts/render_signature.py"`.

SKILL.md

3.7 KB, 733 tokens by cl100k_base, as published. Nobody here has run it

LLM Signature

Provenance, not marketing. A Co-Authored-By: Claude <[email protected]> line says an AI touched the commit and nothing else; this signature records what actually shaped the work — the exact model and the versioned tool stack — as machine-readable git trailers:

Assisted-By: claude-sonnet-5
Agent-Stack: [email protected]; [email protected] (craft-collection); [email protected] (craft-collection)

Trailers are the native mechanism: hidden from git log --oneline, filterable with git log --format='%(trailers:key=Assisted-By)', parseable with git interpret-trailers. Full grammar and semantics: references/spec.md.

Semantics

  • Assisted-By names the model that is writing and orchestrating — the one responsible for the change. One model: the orchestrator at commit time, not every subagent it delegated to. The model is never added as a commit co-author or committer; this trailer is its only appearance.
  • Agent-Stack is environment-at-commit provenance: the harness and the enabled plugins, each as name@version (marketplace) — what was installed and enabled, not a claim that every item fired. The marketplace label is a lookup key (its repo or claude plugin marketplace list resolves it) — URLs stay out of commits.

Generate — always by script, never by hand

A remembered version is wrong the moment anything updates, so the signature is rendered from live sources every time:

uv run --no-project -- python "${CLAUDE_PLUGIN_ROOT}/skills/llm-signature/scripts/render_signature.py"

The model comes from the session transcript (last main-loop assistant message — subagent sidechains never sign; a discovered transcript signs only when fresh and verified against this cwd); the stack comes from claude plugin list and claude --version. --json for machine use, --plugin <name> (repeatable) to narrow the stack, --model / --transcript as explicit overrides. If the model cannot be resolved, the script fails rather than guessing — do not substitute a hand-typed signature; commit unsigned or fix the resolution.

Apply

Commits — in a project that adopts the signature (one declaration in the repo's CLAUDE.md; see references/spec.md § Adopting), run the script at commit time and append its output verbatim as the final paragraph of the commit message. Drop any Co-Authored-By line carrying the vendor's identity (an anthropic.com or claude+noreply address) and any "Generated with Claude Code" badge — the signature replaces both. Real human co-authors keep their lines, even one named Claude.

PR bodies — same block, fenced as text, at the end of the description.

Mechanical enforcement (optional) — --apply <msg-file> rewrites a commit message in place (scrub boilerplate, refresh trailers, never fail the commit), built to be wired as a git prepare-commit-msg hook; recipe in references/spec.md.

What ships with it: 3 files

40.2 KB alongside SKILL.md, 2 of them executable

references/

scripts/

Keep looking

Skills are one crate of 325,949. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.