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 PaulRBerg/agent-skills --skill agents-braingit clone --depth 1 https://github.com/PaulRBerg/agent-skillsWrote 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/paulrberg/agent-skills/agents-brain)<a href="https://agentmods.dev/skills/paulrberg/agent-skills/agents-brain"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/agents-brain/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/paulrberg/agent-skills/agents-brain"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/agents-brain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00037 | $0.02493 |
| Opus 5 | $0.00018 | $0.01247 |
| Sonnet 5 | $0.00007 | $0.00499 |
| Haiku 4.5 | $0.00004 | $0.00249 |
Grade A, and why
agents-brain scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Requires curl and a writable user cache directory; network populates or refreshes the GPT-6 Astra and Claude Fable 5.1 How it starts
The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agents Brain
If these instructions are already present in the conversation from a slash or dollar invocation, follow them directly; do not invoke this skill again through a skill tool.
Create or polish repo-local context as one coherent system: human-facing README.md files, agent-facing AGENTS.md files
with companion CLAUDE.md symlinks, existing project-installed skills under .agents/skills, eligible source-catalog
skills under skills/<name>/, and context docs — any other Markdown files, under any name or directory, whose content
is durable guidance for agents or humans, such as conventions, command catalogs, data-format rules, workflow runbooks,
and reference material.
Success means every selected target is grounded in repository evidence, respects its audience and scope, spends agent context only on guidance that changes behavior, and passes the narrowest repository-defined validation. Stop after reporting completed or planned changes, validation, and any blockers.
Model and Context Optimization
Optimize skills and other agent-facing context for GPT-6 Astra and Claude Fable 5.1 while preserving README.md as clear
human-facing documentation. Before complex, long-running, multi-tool, or orchestration-heavy context work, resolve
scripts/fetch-guidance.sh relative to this skill directory, run it once for gpt-6-astra and once for
claude-fable-5-1, and read both returned files completely. The helper retrieves the official
GPT-6 Astra prompting guidance
and
Claude Fable 5.1 prompting guidance
because their recommendations may evolve. Simple context work does not require either guide.
Accept an integrity-valid cached guide for 24 hours. Use --refresh for explicitly latest or change-sensitive work,
materially disputed guidance, or conflicts with observed model behavior. Interpret helper diagnostics precisely:
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.
- 4d ago Changed · +1 lines 8964d5e0d336
- 10d ago First seen · 180 lines · 37 tokens per session scan A 963246315b1d
agents-brain is a skill published in the GitHub repository PaulRBerg/agent-skills (70 stars, last pushed today), licensed MIT. It adds 37 tokens to every session and 2,493 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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