A command for combining information from several Founder OS brain files into one answer. Founder OS is a collection of files that store a founder's identity, knowledge, and working context.

Answering broad questions across the stored knowledge base, especially when a simple keyword search returns too many relevant files.

It handles questions that span multiple files and provides evidence, confidence, gaps, and stable references instead of a raw list of matches.

brain-pass — Command by ARCASSystems

Install

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.

agentmods

npx agentmods add commands/arcassystems/founderos/brain-pass

Clone the repo

git clone --depth 1 https://github.com/ARCASSystems/FounderOS

Made for: Claude Code.

Or install founder-os, the plugin that ships this one along with the rest of its 9 skills, 45 commands, 6 hooks.

Per session 65 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 507 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00065	$0.00507
Opus 5	$0.00032	$0.00253
Sonnet 5	$0.00013	$0.00101
Haiku 4.5	$0.00006	$0.00051

Measured 3d ago against content hash e017b87fb165, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

brain-pass 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.

.claude/commands/brain-pass.md · 43 lines

What it actually says

Founder OS brain pass

Run the brain-pass skill at skills/brain-pass/SKILL.md end to end.

Procedure

If $ARGUMENTS is empty, reply What should the brain pass over? Re-run as /founder-os:brain-pass "<question>". and stop.
If core/identity.md does not exist, reply Founder OS not set up here. Say "set up Founder OS" first. and stop.
If skills/brain-pass/SKILL.md is missing, reply brain-pass skill not found at skills/brain-pass/SKILL.md. Restarting Claude Code fixes this most of the time, because it reloads what is installed. If it happens again after a restart, say "update Founder OS". and stop.
Follow the brain-pass skill instructions exactly. The question for the pass is $ARGUMENTS.
Output the structured block defined in the skill (Answer / Evidence / Confidence / Gaps).

When to use

A question spans multiple brain files and you want one synthesised answer with citations.
A keyword query (/founder-os:query) returned too many matches to reason across.
You want context with reasoning, not raw text dumps.

When NOT to use

A specific entry ID is known. Use /founder-os:query --mode full --ids <id>.
A simple keyword match is enough. Use /founder-os:query <keyword>.

Examples

/founder-os:brain-pass "what did I decide about pricing tiers?"
/founder-os:brain-pass "what blocks the launch?"
/founder-os:brain-pass "what have I been avoiding for three weeks?"

Rules

Read-only.
No external dependencies.
No em dashes or en dashes.
No banned words.
Cite entry IDs where they exist. Summarise, do not paste raw bodies.

Changes

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 · 43 lines · 65 tokens per session scan A e017b87fb165

Subscribe to this mod's changes

brain-pass is a command published in the GitHub repository ARCASSystems/FounderOS (5 stars, last pushed 19d ago), licensed MIT. It adds 65 tokens to every session and 507 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 2026-08-31.

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