Company Brain Skill for Claude

/company-brain — Team-shared AI-ready knowledge base

Company Brain *(n.)*: Your team's shared, AI-ready knowledge base — people, companies, meetings, SOPs, and decisions structured so Claude can answer questions on your team's behalf.

Team-scope sibling to second-brain (personal-scope). Same core compile → wiki → outputs pattern; different raw schema optimized for multi-author, sales-heavy, ops-heavy team use.

Also the operational backbone for the Company Brain Setup productized service (was previously called "Second Brain as a Service"; renamed to match the skill).

Mental model

Three layers, same as second-brain — but the raw/ layer is *structured*, not flat:

raw/          →  wiki/         →  outputs/
(structured      (compiled        (generated
 by category)     interlinked)     artifacts)

Structured raw/ dirs (each is its own top-level folder in the vault):

| Dir | What lives here |

|---|---|

| people/ | Contacts with context — CRM-lite. One markdown file per person. |

| companies/ | Org profiles — last touchpoint, opportunity size, status. One file per company. |

| meetings/ | Call/meeting transcripts + notes. Naming: YYYY-MM-DD-<company-or-topic>-<slug>.md. Auto-sync source. |

| sops/ | Standard operating procedures. Named: <team>-<process>.md (e.g., sales-outbound-cadence.md). |

| decisions/ | Decision records (narrative form; decide skill's structured form is different). |

| customer-language/ | Verbatim phrases from prospects/customers/users. Fuels copy, headlines, objections. |

| recurring-questions/ | Questions asked 3+ times across calls. Each becomes a pre-answered SOP/FAQ/script. |

| sales-objections/ | Library of objections + best responses. Assembled into sales scripts. |

| raw/ | Legacy / uncategorized captures (fallback bucket, minimize use). |

wiki/, outputs/, and INDEX.md work the same as second-brain.

Reserved dirs (never modified by company-brain): Projects/, Team/, Templates/, Drafts/.

Multi-author discipline

Every capture stamps:

source: <URL / call / email / manual entry>
author: <who added this — email or handle>
captured: YYYY-MM-DD
trust: unreviewed

Wiki pages track cumulative contributions in the ## Sources section (per source file, per author). No overwriting — always append + attribute.

Sensitivity tagging (optional but recommended):

sensitivity: internal        # any team member can read
sensitivity: leadership      # exec team only
sensitivity: confidential    # named list only (list access in the file)

Default: internal. Query mode respects sensitivity — refuses to include confidential content unless the invoker is on the access list.

Trust levels

The other half of multi-author discipline: not everything captured deserves equal weight as context. Every structured-raw file carries a trust: field.

(The field is named trust, not status, because companies/ and decisions/ already use status: for lifecycle — prospect/customer, decided/reversed — and the two must not collide.)

| Trust | Meaning | Query treatment |

|---|---|---|

| unreviewed | Captured but no human has confirmed it (default for every new capture) | Usable, but flagged — answers leaning on it note lower confidence |

| verified | A human reviewed it and confirmed it's right | Full weight |

| deprecated | Wrong or obsolete — kept for history only | Never used as context |

| superseded | Replaced by something newer — add superseded_by: [[target]] | Never used as context; queries point to the replacement |

Deliberately an enum, not a numeric weight — teams keep a four-value field current; nobody maintains a 0–1 float.

Deprecation replaces deletion. The "never delete raw files" rule stays intact: when info turns out wrong or stale, mark it deprecated (or superseded with a pointer) instead of removing it. History is preserved; context is protected.

Trust is orthogonal to sensitivity — a file can be verified + confidential, or unreviewed + internal.

Existing vaults: files predating trust levels simply lack the trust: field — treat them as unreviewed. If the vault's CLAUDE.md schema predates trust levels, offer to add the trust spec to it on the first /cb review run (the vault's CLAUDE.md stays authoritative — extend it, don't override it).

Step 1 — Load vault config + schema

• Read references/vault-config.md for the vault path (default: ${COMPANY_BRAIN_VAULT:-$HOME/Documents/CompanyBrain}/)
• Read <vault>/CLAUDE.md for the authoritative team schema. If present, trust it over references/schema.md — the team's vault is the source of truth.
• If no <vault>/CLAUDE.md, fall back to references/schema.md — the team schema starter kit.

Step 2 — Parse mode

| Invocation | Mode |

|---|---|

| /cb capture / /company-brain capture / "capture this into the team brain" | capture |

| /cb compile / "compile the company wiki" | compile |

| /cb query <q> / "what does the team know about X" | query |

| /cb review / "review the company brain" / "cull the team brain" | review |

| /cb lint / "lint the company brain" | lint |

| /cb connect / "find cross-team connections" | connect |

| /cb search <term> / "search the company brain" | search |

Step 3 — Run the mode

capture

Same intake mechanics as second-brain, but the routing is different — pick the structured dir based on content type.

• Detect content type + route to the right dir:
• Call/meeting transcript → meetings/YYYY-MM-DD-<company-or-topic>-<slug>.md
• Person's LinkedIn / bio / contact context → people/<name-slug>.md
• Company profile / prospect / client → companies/<company-slug>.md
• Documented process / how-we-do-X → sops/<team>-<process>.md
• Decision made by leadership / team → decisions/YYYY-MM-DD-<decision-slug>.md
• Verbatim customer quote → customer-language/<theme-slug>.md (append to existing themed file if one exists)
• Question asked in a call → recurring-questions/<question-slug>.md (append counter if repeat)
• Sales objection heard → sales-objections/<objection-slug>.md (append variant if repeat)
• If ambiguous, ask.

• Add multi-author metadata (top of file):

   source: <URL / call with X on YYYY-MM-DD / email from Y / etc.>
   author: <who captured this>
   captured: YYYY-MM-DD
   trust: unreviewed      # every capture starts unreviewed — review mode promotes it
   sensitivity: internal  # or leadership / confidential

• Save + report file path + one-line summary.

Don't compile into the wiki here — capture is fast intake.

compile

Same core pattern as second-brain's compile mode — process unprocessed structured-raw files into wiki pages, update INDEX.md, add Sources sections.

Differences from second-brain:

• Multi-author attribution: Sources section includes author, not just filename

  ## Sources
  - `people/jane-doe.md` (added by @alex, 2026-06-30) — CTO of Acme, evaluated us Q2

• Cross-category compilation: a wiki page on "Acme Corp deal" might pull from companies/acme.md, meetings/2026-06-15-acme-discovery.md, sales-objections/acme-pricing.md, and people/jane-doe.md — all into one wiki page.
• Sensitivity inheritance: wiki pages inherit the highest sensitivity of any source. If any source is confidential, the wiki page is confidential.
• Trust filtering: deprecated and superseded sources are excluded from wiki pages. If a source that already fed a wiki page later gets deprecated, recompile flags the affected pages for re-review and drops the source, noting it in Sources using the file's reviewed + reviewed_by stamps: - meetings/2026-06-15-x.md (deprecated 2026-07-01 by @alex). Pages built mostly from unreviewed sources get a > ⚠ Mostly unreviewed sources callout at the top.
• INDEX.md categories for teams: Sales, Customers, Ops, Product, Team & People, Decisions, Playbooks. Extend as needed.

Everything else (one-page-per-concept, [[wikilinks]], Connections mandatory, quality > quantity) is identical.

query

Same as second-brain query, plus:

• Sensitivity check first: identify the invoker; refuse to include content above their sensitivity level.
• Trust rules: prefer verified over unreviewed, and recent over old. Never use deprecated or superseded content as context — at most cite it as a pointer: *"(deprecated — see [[replacement]])"*. When two sources conflict, prefer the newer + higher-status one AND surface the disagreement in the answer.
• Confidence flag: if the answer leans mostly on unreviewed sources, say so up front: *"Low confidence — 3 of 4 sources are unreviewed. Run /cb review to firm these up."*
• Author-aware answers: when citing, include who contributed the info: *"Per [[Acme Deal]] (source: meetings/2026-06-15-acme-discovery.md by @alex)..."*
• Route external gaps to deep-research, same as second-brain.

Save to outputs/<YYYY-MM-DD>-<question-slug>.md with the answer + wiki pages consulted + sensitivity level of the output.

review

The human culling pass. This is how a team keeps garbage-in from becoming garbage-context: everything gets captured freely (nothing is lost), but only reviewed info earns full weight.

• Sensitivity check first — same rule as query mode: identify the invoker and exclude files above their sensitivity level from the queue. Report the exclusion count: *"3 items above your sensitivity level were skipped — someone on the leadership list needs to review those."*

• Build the triage queue:
• All trust: unreviewed files across the structured-raw dirs (including files with no trust: field at all), newest first
• Everything lint flags (checks 1–12; check 13 is about review itself)
• Files whose review dates have lapsed, where those fields exist: decisions/ files past review_by, sops/ files past last_reviewed + review_cadence

• Walk the queue one item at a time. For each file show: one-line summary, source, author, captured date, and which wiki pages cite it. Offer four dispositions — every disposition except skip stamps reviewed: YYYY-MM-DD + reviewed_by: <handle>:
• verify → trust: verified
• deprecate → trust: deprecated (wrong or obsolete; kept for history)
• supersede → trust: superseded + superseded_by: [[target]] (ask for the replacement)
• skip → leave as-is, resurfaces next review

• Batch-apply the frontmatter updates — don't rewrite file bodies, only the metadata block.

• Flag downstream effects: if a deprecated/superseded file feeds existing wiki pages, list those pages and offer to recompile them now.

• Close with a summary: *"12 reviewed: 8 verified, 3 deprecated, 1 superseded. 2 wiki pages recompiled. Next review suggested: <date>."* Save the summary to outputs/<YYYY-MM-DD>-review.md so the cull itself has an audit trail.

Cadence: weekly for active vaults; pair with loopify to schedule it so the cull actually happens instead of depending on someone remembering. A vault where reviews lapse >1 month shows up in lint (check 13).

lint

Same seven checks as second-brain PLUS:

• Stale people/companies — people/ or companies/ file with no update in >6 months for active accounts
• Recurring-questions above threshold — questions asked 5+ times without a wiki page or SOP

10. Objections without responses — sales-objections/ files with no linked response in sops/ or wiki/

11. SOP freshness — SOPs not touched in >12 months (may be stale as the business evolves)

12. Author load imbalance — one contributor doing >80% of captures (usually signals the vault is one-person-dependent — bad for team continuity)

13. Review backlog — >20 files sitting at trust: unreviewed, or no review pass (no outputs/*-review.md) in >1 month. Points at /cb review.

connect

Same as second-brain plus cross-category link suggestions — e.g., sales-objections/pricing-too-high.md should link to customer-language/willingness-to-pay.md and sops/discovery-call-cadence.md if they exist.

search

Same. Grep across all structured-raw dirs + wiki/.

Optional: auto-sync sources

Team vaults benefit from automated capture. See references/auto-sync-sources.md for the setup patterns:

| Source | What it captures | Setup |

|---|---|---|

| Fathom / Gong / Granola | Call/meeting transcripts | Webhook → append to meetings/ |

| Slack export | Team discussions worth preserving | Manual or scheduled export → raw/slack-<channel>-<date>.md |

| Email (Front / Missive / Superhuman) | Customer-facing threads worth preserving | Forward-to-address → append to people/ or companies/ |

| CRM (HubSpot / Attio / Pipedrive) | Deal state, contact info | Periodic sync → companies/ + people/ |

Auto-sync is optional — most teams start with manual capture and add automation as the vault matures. Pair with loopify to schedule periodic sync jobs.

Composes with

• second-brain — sibling. Use second-brain for your personal wiki; company-brain for the team's. A person can maintain both simultaneously with separate vault paths.
• skillify — use to author new skills that read from the company brain (e.g., a weekly-team-brief skill that queries company-brain every Monday).
• loopify — schedule auto-sync jobs (Fathom pull daily, Slack export weekly, review pass weekly, INDEX lint monthly).
• toolify — wire up integrations that feed the company brain (Fathom webhook receiver, Attio API, etc.).
• deep-research — when query finds gaps, route external. Save deep-research results into raw/ for future compilation.
• decide — decisions/ folder complements decide's structured archive. decide records the *evaluation*; decisions/ records the *narrative + outcome + review notes*.
• pm — team task management sits in Projects/ (reserved from company-brain). pm owns Projects/; company-brain reads it for context but doesn't modify.
• jab-hook — customer-language/ fuels social copy that resonates with actual prospect language.
• A blog-drafting skill (yours or a companion plugin) — pulls from customer-language/, recurring-questions/, and sops/ for authoritative blog drafts.

Sibling implementations (reference)

Same lineage as second-brain:

• Gbrain — Garry Tan's team-scale brain (146K pages, 24K people entities). Postgres/PGLite backed with graph traversal + scheduled maintenance. When a team's company-brain outgrows markdown-only, Gbrain is the upgrade path.
• Hermes' llm-wiki — reference for the 3-folder pattern.
• Notion AI / Glean / Mem — commercial "Company OS" tools. Company-brain is the Claude-native, markdown-first alternative — cheaper, more portable, better for teams that already live in Obsidian / Git-backed docs.

Notes on quality

• Structured raw > flat raw at team scale. Second-brain's type-prefix works for one person; teams need dedicated dirs for people/companies/meetings/etc. so multi-author search stays fast.
• Multi-author attribution is non-negotiable. Every file stamps author: and captured:. Wiki pages cite by source + author.
• Sensitivity is respected end-to-end. Query mode refuses to include content above the invoker's level. Wiki pages inherit the highest sensitivity of any source.
• Never delete raw files. Same rule as second-brain — the structured dirs are the source of truth. When info is wrong or stale, deprecate, don't delete — trust: deprecated removes it from context while preserving history.
• Capture freely, weight deliberately. The trust enum means dumping information in is safe — nothing unreviewed poisons answers at full weight, and /cb review is the regular cull that promotes or retires it.
• Never modify Projects/, Team/, Templates/, Drafts/ during company-brain operations.
• Auto-sync is optional. Start manual; automate as the vault matures. Don't burn cycles on Fathom webhooks before the team is capturing meetings regularly by hand.
• One person shouldn't be the whole vault. If lint flags author-load imbalance >80%, the team is one bus-factor away from losing the brain. Broaden contribution.