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/idea-lineageWrote 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/idea-lineage)<a href="https://agentmods.dev/skills/garrytan/gbrain/idea-lineage"><img src="https://agentmods.dev/badge/skills/garrytan/gbrain/idea-lineage.svg" alt="Measured on agentmods" height="20"></a>- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 4 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 Agent Snooping · line 71 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 208 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 209 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 210 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 | $0.00060 | $0.02001 |
| Opus 5 | $0.00030 | $0.01001 |
| Sonnet 5 | $0.00012 | $0.00400 |
| Haiku 4.5 | $0.00006 | $0.00200 |
Grade A, and why
idea-lineage 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 8d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- idea-lineage — 100% identical, 0 lines differ
- idea-lineage — 94% identical, 34 lines differ
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
idea-lineage - Single-Idea Evolution Through the Brain
Convention: see conventions/quality.md for citation rules, quote fidelity, and source-backed claims.
Boundary: see docs/takes-vs-facts.md for the distinction between holder-attributed takes and the brain owner's hot facts. Do not collapse those layers when summarizing lineage.
What this solves
Users often want to understand how one idea changed across time: when it first appeared, when it became sharp, what it displaced, what it contradicted, and what version is alive now. That is different from building a whole concept map and different from charting an entity's metric trajectory.
Use this skill when the user asks about one idea, topic, phrase, or concept page and wants its evolution through the brain.
Canonical examples:
- "Run idea lineage on founder-led sales."
- "How has my thinking about compounding trust changed?"
- "What is my current version of this idea?"
- "Where did this idea come from, and what did I abandon along the way?"
What this is not
- Not
concept-synthesis: that skill deduplicates many concept stubs, tiers them, writes concept pages, and builds a broad intellectual map. - Not
find_trajectory: that operation charts typed facts or event rows for an entity, such as MRR, role, location, or status over time. - Not a contradiction-probe runner: this skill may read cached contradiction findings when available, but it does not launch expensive probes.
- Not a writing mode by default: do not write a lineage page unless the user explicitly asks for a saved artifact after seeing the read-only answer.
Contract
This skill guarantees:
- A single-idea scope is preserved. Broad corpus or "map my concepts" prompts
route to
skills/concept-synthesis/SKILL.mdinstead. - Every lineage claim cites existing brain evidence: page slug, source id when present, date, and short quote or snippet.
- Missing evidence is labeled as a gap, not patched with plausible narrative.
- Contradictions, reversals, and abandoned branches are separated from normal temporal evolution.
- The default mode is read-only and does not mutate brain pages.
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.
- 8d ago First seen · 223 lines · 60 tokens per session scan A bbf37781d93b
idea-lineage is a skill published in the GitHub repository garrytan/gbrain (29,702 stars, last pushed today), licensed MIT. It adds 60 tokens to every session and 2,001 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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