dco-guard

A Git hook that checks whether commits contain a Signed-off-by line, a contributor-acknowledgement record used by some projects.

In plain words
What is it for?
Use it in repositories that require sign-offs to check commits after Git commands and suggest rebasing with sign-off information.
Why use it?
It catches commits that do not meet a repository’s sign-off policy and points to a command that can repair existing commits.

Plugin for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code
/plugin marketplace add lexfrei/ccc
agentmods
npx agentmods add plugins/lexfrei/ccc/dco-guard
Clone the repo
git clone --depth 1 https://github.com/lexfrei/ccc

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

dco-guard scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

hooks/dco-guard/.claude-plugin/plugin.json · 10 lines

What it actually says

{
  "name": "dco-guard",
  "version": "1.0.0",
  "description": "PostToolUse hook that catches commits missing the Signed-off-by trailer — fires after every git command, stays silent in repositories that don't sign off, and suggests git rebase --signoff to repair",
  "author": {
    "name": "Aleksei Sviridkin",
    "email": "[email protected]"
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 10 lines scan A eb7f4b5592b7

Subscribe to this mod's changes

dco-guard is a plugin published in the GitHub repository lexfrei/ccc (9 stars, last pushed 2d ago), licensed BSD-3-Clause. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.