Llm signature

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

A Claude Code plugin marketplace that codifies engineering craft: disciplined Python and data-engineering practice alongside deliberate session-knowledge workflows, packaged as reusable skills.

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.

One thing 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.

What its author says it does

Copied from the file, not written here

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).

SKILL.md

3.7 KB, 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.