GBrain is a memory and retrieval layer for AI agents that searches, connects, and synthesizes information from stored sources. It is used to give coding agents and autonomous agents access to knowledge beyond their current code, including shared company information with access controls. The catalogue add-ons help agents operate GBrain and connect it to agent workflows.
Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/garrytan/gbrainnpx agentmods add skills/garrytan/gbrain/brain-link-disciplineWrote 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/garrytan/gbrain/brain-link-discipline)<a href="https://agentmods.dev/skills/garrytan/gbrain/brain-link-discipline"><img src="https://agentmods.dev/badge/skills/garrytan/gbrain/brain-link-discipline/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/garrytan/gbrain/brain-link-discipline"><img src="https://agentmods.dev/badge/skills/garrytan/gbrain/brain-link-discipline.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 123 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Excessive Agency · line 137 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Agent Snooping · line 240 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 254 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 256 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00115 | $0.02818 |
| Opus 5 | $0.00057 | $0.01409 |
| Sonnet 5 | $0.00023 | $0.00564 |
| Haiku 4.5 | $0.00012 | $0.00282 |
Grade C, and why
brain-link-discipline scanned grade C with 2 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 9d 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.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
the token isn't scoped to) would harvest the credential. For a github.com Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sf -o /dev/null -w '%{http_code}' \ How it starts
The opening of the file, as written. The whole thing — 259 lines — stays where its author put it; the contents beside it link to each section on GitHub.
brain-link-discipline — The Link Is Part of the Deliverable
Convention: see _output-rules.md — the Deterministic Links section carries the cross-skill canon (in-page relative vs in-message verified, plus the fallback chain). This skill carries the mechanics: path derivation, push-before-link ordering, verification, the subagent-relay rewrite, and bulk-list formatting.
Convention: conventions/brain-first.md states the one-line principle ("every brain page reference in output should use a clickable link format appropriate to the deployment"). This skill is that line's full expansion.
This is a reporting convention the harness routes brain-page delivery messages through — a standing rule to apply when composing such messages, not a mechanical guarantee enforced by tooling.
The rule (same message)
If you commit and push a brain page, the link goes in the SAME message that reports the work. Every time. No "let me commit and push" without the link landing in that same reply once the push succeeds. The user should never have to ask "give me the link" or "where is the page."
This applies to:
- Any message reporting a created or edited brain page
- Bulk reports ("5 pages created" — every page gets its own link line)
- Referencing a brain page in normal conversation
- Relaying subagent results that mention brain paths (rewrite first — see below)
The most common link bug is committing a brain page and forcing the user to go find it. The link is a deliverable, not a follow-up.
Scope split: in-message vs in-page (the inversion)
The two output surfaces take OPPOSITE link forms:
| Surface | Link form | Why |
|---|---|---|
| Chat message to the user | Absolute, verified URL (or the fallback chain below) | Repo-relative paths aren't clickable in chat surfaces |
| Inside a brain page body | RELATIVE markdown link: [Alice Example](../people/alice-example.md) |
gbrain's link extraction builds the links/backlinks graph — which powers relational retrieval — from filesystem-relative links. An absolute URL between two brain pages is invisible to that graph |
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.
- 9d ago First seen · 259 lines · 115 tokens per session scan C 489268f71a01
brain-link-discipline is a skill published in the GitHub repository garrytan/gbrain (29,702 stars, last pushed today), licensed MIT. It adds 115 tokens to every session and 2,818 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it C with 2 findings (harvests environment variables, 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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