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 skills/drdroidlab/open-index/edit-brainnpx skills add DrDroidLab/open-index --skill edit-braingit clone --depth 1 https://github.com/DrDroidLab/open-indexWhat 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 | $0.00055 | $0.00584 |
| Opus 5 | $0.00028 | $0.00292 |
| Sonnet 5 | $0.00011 | $0.00117 |
| Haiku 4.5 | $0.00006 | $0.00058 |
Grade A, and why
edit-brain 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 3d 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 — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Editing this brain
This repo is a brain (a context graph built with Open Index). You can edit it two equivalent ways — both land in the same validated store, so pick whichever fits:
- Over MCP (server
open-index):create_doc_type,put_entity. Preferred when the server is connected. - By editing files then running
open-index indexandopen-index validate.
Always start here
Use the navigation guide pre-injected by the MCP host, when available. Otherwise
call navigation_guidelines() (MCP) or read doc_types/*.yaml. It tells you which
doc_types exist, their fields, and the relationship vocabulary already in use.
Reuse existing doc_types and relationship meanings instead of inventing near-duplicates.
Add / update an entity
- Id must be
<doc_type>:<slug>(e.g.service:checkout).put_entityis an upsert. - Fill the doc_type's schema fields. Correlate with
related_to:{ "target": "<id>", "relationship_edge_meaning": "<meaning>" }. Prefer a declared relationship meaning for the doc_type (see the guide); it's validated. - File-backed doc_types → the entity is written to
entities/<doc_type>/<slug>.json. Index-backed → it lives only in the DB. You don't choose per-write; the doc_type does.
Define a new doc_type (only if none fits)
create_doc_type, or write doc_types/<name>.yaml:
doc_type: <name>
description: <what it is>
storage: index # index = DB-owned (generated/high-volume) · file = git-tracked (curated)
display: { label_field: name, color: "#6b7280" }
schema:
fields:
- { name: name, type: string, search: syntactic, boost: 6 } # boost = search weight
- { name: description, type: text, search: semantic }
relationships: # declare the edges this type uses, so they're discoverable
- { name: "<meaning>", target_doc_type: <other_type> }
After editing files
Run open-index index (loads file-backed entities) then open-index validate.
Fix any reported errors (bad ids, wrong relationship target types) before finishing.
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.
- 3d ago First seen · 51 lines · 55 tokens per session scan A 9837175263ae
edit-brain is a skill published in the GitHub repository DrDroidLab/open-index (105 stars, last pushed 21d ago), licensed MIT. It adds 55 tokens to every session and 584 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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