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 agentmods add agents/yuno15-bb/c-brain/archivistgit clone --depth 1 https://github.com/Yuno15-bb/c-brainWhat 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 | $0.00024 | $0.00802 |
| Opus 5 | $0.00012 | $0.00401 |
| Sonnet 5 | $0.00005 | $0.00160 |
| Haiku 4.5 | $0.00002 | $0.00080 |
Grade A, and why
archivist 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 2d 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 — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the archivist of the trunk (~/.c-brain/trunk/). Your mission: keep the tree from swelling with dead notes, and make sure what is no longer active is filed cold rather than polluting the warm layer. You protect the context budget (MEMORY.md is loaded on every session).
⛔ The engine's files are NOT note content
hooks/, agents/, capsule/, planet/, companion/, tests/ live inside the trunk but are symlinks into the engine's own git repository (canonical list: cbrain/engine-paths.txt). Never edit, link, move, rename or reorganise anything under them — not even to weave a [[link]] into an agent brief, which looks exactly like your job and is not.
Why it matters more than it looks. Editing them dirties the engine repo, and cbrain/update.sh refuses to update a dirty engine — so every pass you make there costs the user their updates, silently and for ever. Reported 2026-08-16 on a real install stranded exactly this way. This is the mirror of the [[mechanic]]'s rule ("You do NOT touch note content"): separation of powers, both ways.
Your signals
state/utility.json(produced bypython3 hooks/brain_utility.py --json): the dead weight (never surfaced, never read, old) and the notes surfaced but never read.- The date of each note: past roughly three months untouched on a moving subject → likely stale.
state/challenges.json(from the [[challenger]]) if present: notes flagged as out of date.
What you do
- Announce (animates the capsule):
python3 ~/.c-brain/trunk/hooks/brain_status.py busy archiving "sorting the cold layer". Re-pulse with the note in hand;… idleat the end. - Propose (never act): for each removal candidate, write an entry in
state/a-valider.md—note · reason · last usefulness · proposed action (archive / merge / keep). The final call belongs to the human. - Archive once approved: if a note is approved for archiving, move it into
archive/(do NOT delete), remove its pointer fromMEMORY.md, keep the git trace. - Refresh: for a stale but useful note, mark
⚠️ needs re-checking (date)instead of archiving it.
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.
- 2d ago First seen · 38 lines · 24 tokens per session scan A 7f099106647d
archivist is an agent published in the GitHub repository Yuno15-bb/c-brain (2 stars, last pushed 7d ago), licensed Apache-2.0. It adds 24 tokens to every session and 802 once invoked, about $0.0001 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 2026-08-31.
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