mirroir-mcp: Skill for Claude Code

.claude/skills/register-limitation/SKILL.md

register-limitation is a skill for Claude Code from jfarcand/mirroir-mcp. It costs 60 tokens per session (1,182 once invoked), scanned A, original, Apache-2.0.

A workflow for recording known gaps in a project's limitation register, a tracker for incomplete or deliberately disabled work.

In plain words
What is it for?
Filing limitation issues, adding LIMITATION markers, and recording features that are disabled, shadowed, or log-only when register checks require it.
Why use it?
It prevents unfinished behavior, deferred work, and dark-launched features from being forgotten or explained only in code comments.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

This is jfarcand/mirroir-mcp's own configuration. It tells Claude Code how to work on mirroir-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mirroir-mcp configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is ./.registre/limitation-gates.sh Sources runner/src npm scripts website/src.

Reuse

Borrowing it

Nothing to install: this file belongs to jfarcand/mirroir-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/jfarcand/mirroir-mcp/main/.claude/skills/register-limitation/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/jfarcand/mirroir-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for register-limitation

README.md
[![agentmods](https://agentmods.dev/badge/skills/jfarcand/mirroir-mcp/register-limitation/github.svg)](https://agentmods.dev/skills/jfarcand/mirroir-mcp/register-limitation)
Your own site
<a href="https://agentmods.dev/skills/jfarcand/mirroir-mcp/register-limitation"><img src="https://agentmods.dev/badge/skills/jfarcand/mirroir-mcp/register-limitation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for register-limitation

Your own site · 80×15
<a href="https://agentmods.dev/skills/jfarcand/mirroir-mcp/register-limitation"><img src="https://agentmods.dev/badge/skills/jfarcand/mirroir-mcp/register-limitation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,182 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00060 $0.01182
Opus 5 $0.00030 $0.00591
Sonnet 5 $0.00012 $0.00236
Haiku 4.5 $0.00006 $0.00118

Measured 11d ago against content hash 987e0321b099, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

register-limitation 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 11d 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.

.claude/skills/register-limitation/SKILL.md · 115 lines

How it starts

The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Register a Limitation

When this fires

Any of these, without exception:

  • The register gates failed — "unregistered deferral/confession prose", "malformed LIMITATION marker", a file over the 500-line cap, or an inline clippy allow outside the declared list.
  • You are about to write a comment explaining why something is incomplete, restricted, or deferred.
  • You are shipping a feature disarmed (flag off, shadow mode, log-only phase).
  • You found a gap while reading code and are not fixing it in this change.

The gates are the Apache-2.0 llm-registre tool, vendored as the .registre submodule and run by Tier 1 of runner/scripts/ci/pre-push-validate.sh and by CI (limitation-register.yml).

Step 0 — try to not need this

The register exists so honest gaps become tracked obligations, not so gaps become easy to ship. If you can implement the real thing now, do that instead. Registering is the fallback, and it costs a permanent entry someone has to close later. (A file over the cap or a stray inline allow is never registered — extract the helper or fix the lint.)

Where issues go

Read registre.toml at the repo root — its tracker key names this repo's register. Never assume; registers are per project. For mirroir that is jfarcand/mirroir-carnet.

grep tracker registre.toml
Tracker whatever registre.toml says
Labels limitation + this repo's name (iphone-mirroir-mcp)
Title [mirroir-mcp] <short statement of the gap> — always project-prefixed

Never file on the code repo itself. It is PUBLIC, and a limitation issue states precisely where a capability or defence is incomplete — a roadmap when the code is open. Issue bodies may hold reasoning and residual risk; the code comment stays thin.

Step 1 — file the issue

TRACKER=$(sed -n 's/^tracker[[:space:]]*=[[:space:]]*"\(.*\)"/\1/p' registre.toml)

gh issue create -R "$TRACKER" \
  --title "[mirroir-mcp] Short statement of the gap" \
  --label limitation --label iphone-mirroir-mcp \
  --body "Where it is (file + symbol). What is incomplete. What the correct fix looks like."

Read the full file on GitHub · 115 lines

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. 11d ago First seen · 115 lines · 60 tokens per session scan A 987e0321b099

Subscribe to this mod's changes

register-limitation is a skill published in the GitHub repository jfarcand/mirroir-mcp (214 stars, last pushed 2d ago), licensed Apache-2.0. It adds 60 tokens to every session and 1,182 once invoked, about $0.0003 per session on Opus 5. 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 2026-08-30.

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