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 zgbrenner/agentcounsel --skill case-briefgit clone --depth 1 https://github.com/zgbrenner/agentcounselWrote 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/zgbrenner/agentcounsel/case-brief)<a href="https://agentmods.dev/skills/zgbrenner/agentcounsel/case-brief"><img src="https://agentmods.dev/badge/skills/zgbrenner/agentcounsel/case-brief.svg" alt="Measured on agentmods" 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 | $0.00068 | $0.02936 |
| Opus 5 | $0.00034 | $0.01468 |
| Sonnet 5 | $0.00014 | $0.00587 |
| Haiku 4.5 | $0.00007 | $0.00294 |
Grade A, and why
Case Brief 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Case Brief
Purpose
Produce a structured, attorney-ready brief of a single judicial opinion. The brief extracts the facts, procedural posture, issue, holding, reasoning, rule, and authority weight into a fixed template, with every slot tied to a specific passage in the opinion the user has provided. It produces draft legal work product for attorney review; it is not legal advice, and it does not determine whether the case binds the operative forum or supports any specific proposition.
The most important disciplines this skill enforces:
- Every slot is sourced. No facts, no holding, no rule statement appears in the brief unless it traces to a pinpoint passage in the provided opinion. The skill does not brief the case from memory; it extracts the language of the opinion into slots.
- The brief pushes back rather than completes. Where the opinion is ambiguous, the holding is narrow, the reasoning is fact-bound, or the rule is qualified, the brief flags the ambiguity and writes a
[VERIFY: ...]placeholder rather than smoothing the gap. The attorney is the verifier; the skill is the leash. - Authority weight is named, not assumed. The brief states the court, the date, the precedential level (binding / persuasive / non-precedential), and a Relevance-to-these-facts note. Whether the case is binding in the operative forum is an attorney-verification item; the skill does not assume.
Use When
- A specific case has been identified for review and needs a structured brief before being integrated into a memo, brief, or chart.
- A user provides an opinion and asks "what does this case say?" or "is this case relevant to X?"
- A research workflow has surfaced 1–N cases and each needs to be briefed in the same shape before authority synthesis.
- A litigation team needs a structured handoff brief for a case the attorney must read before relying on it.
- A student or new lawyer needs a worked, pinpoint-cited brief of a case to learn how to read judicial opinions.
What ships with it
1 file 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.
- 4d ago First seen · 144 lines · 68 tokens per session scan A 80b3e5eb9e75
Case Brief is a skill published in the GitHub repository zgbrenner/agentcounsel (18 stars, last pushed 1mo ago), licensed MIT. It adds 68 tokens to every session and 2,936 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 2026-09-03.
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