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.
npx skills add FlorianBruniaux/starmapper --skill differential-reviewgit clone --depth 1 https://github.com/FlorianBruniaux/starmapperWrote 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.
[](https://agentmods.dev/skills/florianbruniaux/starmapper/differential-review)<a href="https://agentmods.dev/skills/florianbruniaux/starmapper/differential-review"><img src="https://agentmods.dev/badge/skills/florianbruniaux/starmapper/differential-review/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.
<a href="https://agentmods.dev/skills/florianbruniaux/starmapper/differential-review"><img src="https://agentmods.dev/badge/skills/florianbruniaux/starmapper/differential-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.01564 |
| Opus 5 | $0.00030 | $0.00782 |
| Sonnet 5 | $0.00012 | $0.00313 |
| Haiku 4.5 | $0.00006 | $0.00156 |
Grade A, and why
differential-review 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 10d 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 221 lines · 61 tokens per session scan A 72a1e8dc98d5
differential-review is a skill published in the GitHub repository FlorianBruniaux/starmapper (84 stars, last pushed 8d ago), with no licence file. It adds 61 tokens to every session and 1,564 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.
Other skills, from other repositories
malloy-review
Malloy semantic-model code review. Invoke when the user asks to review, audit, or critique a .malloy file, a folder of Malloy models, or a GitHub PR that touches Malloy. Enforces project modeling standards and emits a navigable review file.
malloy-lookml-review
Analyze LookML files as prior art for Malloy modeling. Used during Step 1 (DISCOVER) when .lkml files are present. Coordinates reference files that extract business logic, relationships, and curation decisions. Works with or without a database connection.
source-code-inspection
Investigate application or repository source code with searchfile and readfile to explain behavior, trace root causes of runtime or query errors, and answer with precise file citations.
github-remote
Read-first wrapper around the GitHub REST API. Single-call PR/branch overviews (PR state + checks + reviews + workflow runs + mergeable) for triage. Use whenever the user wants the state of a PR, a branch's CI, or a failing run — without you chaining gh pr view, gh pr checks, gh run view, gh pr list --head per…
code-simplifier
Post-session code review and cleanup against a working tree of changes. Analyzes git diff to simplify, consolidate, and align changed code with the existing codebase — modernize syntax, remove unnecessary complexity, consolidate duplicated logic, catch efficiency issues. Use after a substantive working session, or…
autoreview
Pre-commit/ship code review: Codex default; optional Claude or Pi.