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Open Second Brain

Memory server

First committed by hermes-vps-agent

Published in itechmeat/open-second-brain. Publisher page

550 GitHub stars

What it is

Second brain for AI agents using Obsidian-compatible Markdown vaults. Works with Hermes, Claude Code, Codex, and OpenClaw.
— the description by hermes-vps-agent

AutoGineer overview, from the brain’s own files

Open Second Brain acts as a memory provider for AI agents, enabling them to read and write persistent knowledge directly into an Obsidian-compatible Markdown vault. It employs a deterministic 'dream' pass to convert repeated signals into actionable rules, while maintaining a hash-chained log for auditability. The system supports various agent clients through MCP servers, lifecycle hooks, and a dedicated CLI, ensuring that agent-learned information remains accessible, versioned, and searchable as standard Markdown files.

How it works

Memory model: Hybrid

AutoGineer overview, from the brain’s own files

The system organizes data into a Brain folder containing Markdown files. Agents interact with this vault via MCP servers, lifecycle hooks, or the o2b CLI. Signals from agents are stored in an inbox, processed through a dream pass to generate preferences, and stored as rules in active.md. A search index is maintained in a hidden directory and can be rebuilt from the source files. The system also supports truth ledgers, decision models, and staged review gates for agent writes.

Folders
FolderRoleFiles
.githubagent-config7
binscripts1
docsdocs774
hookshooks35
scriptsscripts22
skillsagent-instructions6
srcsource-code1496
templatestemplates23
teststests2101
.agentsfolder1
.ai-notesfolder1
.apbfolder87
.claude-pluginfolder2
.codex-pluginfolder1
.githooksfolder2
installfolder16
openclawfolder1
openspecfolder33
pluginsfolder21
schemasfolder5

The agent reads

The agent writes

Requirements

Runtimes: Node.js, Python >=3.11, Bun

Databases: SQLite

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Google Antigravity, Kiro, OpenCode, Amp, Roo Code, Cline, JetBrains Junie, Devin (ex-Windsurf)

Set it up

  1. This brain runs code automatically: 54 hooks (codex), 3 scripts. Review .githooks/pre-commit, .githooks/pre-push, hooks/hooks.json, package.json, plugins/codex/hooks/hooks.json before opening the folder in Claude Code. No step below turns a hook on for you.

    • .githooks/pre-commit: runs on git pre-commit
    • .githooks/pre-push: runs on git pre-push
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" post-write-reminder; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook post-write-reminder; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-agenda; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-agenda; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" backlog-nudge; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook backlog-nudge; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" log-catchup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook log-catchup; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" view-render; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook view-render; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" recall-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook recall-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" nav-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook nav-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" counterparty-brief; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook counterparty-brief; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-orient; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-orient; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-host-backup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-host-backup; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" stop-log-guardrail; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook stop-log-guardrail; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" answer-quote-check; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook answer-quote-check; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" hygiene-digest; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook hygiene-digest; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-promote; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-promote; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
    • hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • package.json: bun scripts/prepare.ts || exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" post-write-reminder; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook post-write-reminder; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-agenda; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-agenda; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" backlog-nudge; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook backlog-nudge; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" log-catchup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook log-catchup; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" view-render; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook view-render; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" recall-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook recall-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" nav-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook nav-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" counterparty-brief; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook counterparty-brief; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-orient; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-orient; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-host-backup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-host-backup; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" stop-log-guardrail; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook stop-log-guardrail; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" answer-quote-check; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook answer-quote-check; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" hygiene-digest; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook hygiene-digest; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-promote; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-promote; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
    • plugins/codex/hooks/hooks.json: r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  2. Not scanned by AutoGineerThe author’s MCP configuration (.claude-plugin/plugin.json) also starts it in a way AutoGineer does not offer. Read that file: AutoGineer did not scan that path; what it runs is listed under “This brain runs”. https://github.com/itechmeat/open-second-brain/blob/233b91d1bdc7cf74c47ea1c1fd72e949887e1fc4/.claude-plugin/plugin.json

  3. First committed by hermes-vps-agent. Published in itechmeat/open-second-brain. Licence: MIT License.

Usage

AutoGineer overview, from the brain’s own files

  • Initialize a new vault for agent memory
  • Connect agents like Claude Code or Codex via MCP
  • Manage agent preferences and rules through automated dream passes
  • Audit agent activity using hash-chained logs
  • Perform semantic or keyword searches across agent-generated notes
  • Enforce write-path integrity with staged review gates
“o2b brain today”
Displays the current day's view and active memory markers for the agent session.
“o2b brain rollback”
Restores the vault state from the last snapshot, reversing recent brain mutations.

Documentation by hermes-vps-agent

Open Second Brain

Image: Open Second Brain - your knowledge, amplified by AI

Open Second Brain is a memory layer for AI agents that lives in an Obsidian vault. Agents read and write it through MCP servers, lifecycle hooks and the o2b CLI. Everything the agent learns is a Markdown file under Brain/, so you can open, edit, grep and version it like any other note. A deterministic dream pass turns repeated signals into rules and retires the ones nothing uses; no model runs inside that algorithm.

How it fits

flowchart LR
    subgraph Clients["Agent clients"]
        Plug["Plugins: Claude Code, Codex,<br/>Hermes, opencode, Grok Build"]
        Mcp["MCP config: Cursor, kiro, Copilot CLI,<br/>Gemini CLI, ZCode, any MCP host"]
        Claw["OpenClaw<br/>in-process plugin"]
        Cliu["Aider, Pi<br/>CLI and context file"]
    end
    subgraph Product["Open Second Brain"]
        Srv["MCP servers<br/>open-second-brain, open-second-brain-writer"]
        Hooks["Lifecycle hooks<br/>o2b-hook"]
        Cli["CLI<br/>o2b"]
        Core["Core"]
    end
    subgraph Vault["Your vault"]
        Brain["Brain/<br/>Markdown the agent writes"]
        Notes["Your notes"]
        Index[(".open-second-brain/brain.sqlite<br/>rebuildable search index")]
    end
    Plug --> Srv
    Plug --> Hooks
    Mcp --> Srv
    Claw --> Core
    Cliu --> Cli
    Srv --> Core
    Hooks --> Core
    Cli --> Core
    Core --> Brain
    Core --> Index
    Core -. reads, writes a named note on request .-> Notes

Each client reaches the same core through a plugin, an MCP registration or the CLI. The core keeps its own records under Brain/ and a generated search index under .open-second-brain/ that it can rebuild from the files. Your notes are read; the note tools write one only at a path the caller names.

flowchart LR
    Agent["Agent"] -->|brain_feedback| Inbox["Brain/inbox/<br/>signal"]
    Inbox -->|dream pass| Pref["Brain/preferences/<br/>rule"]
    Pref -->|rendered into| Active["Brain/active.md"]
    Active -->|read at session start| Agent
    Agent -->|brain_apply_evidence| Log["Brain/log/"]
    Log -->|next dream pass| Pref

The learning loop: signals become rules, rules reach the next session through Brain/active.md, and applied or violated evidence confirms, quarantines or retires them. Details: docs/how-it-works.md.

Install

  1. Install Bun 1.1 or later: install/prerequisites.md.

  2. Install the plugin for your client (guides below), or get the o2b CLI: install/prerequisites.md.

  3. Create the vault files:

    o2b init       --vault /path/to/vault --name "My Second Brain"
o2b brain init --vault /path/to/vault

  4. Connect the client (table below), then check the result:

    o2b doctor --vault /path/to/vault
o2b install --check

The full router with readiness criteria is install.md; native Windows is covered in install/windows.md.

Supported clients

ClientIntegrationGuide
Claude CodeMarketplace plugin: MCP servers and hooksinstall/claudecode.md
OpenAI CodexMarketplace plugin, then o2b install --target codex --applyinstall/codex.md
ChatGPT desktopReads the shared Codex config: o2b install --target codex --applyinstall/codex.md
Hermes AgentPlugin and memory providerinstall/hermes.md
OpenClawNative plugin, no MCPinstall/openclaw.md
opencodeo2b install --target opencode --apply: MCP servers and a native plugininstall/opencode.md
Grok Buildo2b install --target grok --apply: MCP servers and hooksinstall/grok.md
Cursoro2b install --target cursor --applyinstall/cursor.md
kiroo2b install --target kiro --applyinstall/kiro.md
GitHub Copilot CLIo2b install --target copilot-cli --applyinstall/copilot-cli.md
Gemini CLIo2b install --target gemini-cli --applyinstall/gemini-cli.md
ZCodeMCP servers added to its config by handinstall/zcode.md
Aidero2b install --target aider --apply: context file, no MCPinstall/aider.md
Pio2b install --target pi --apply: skill over the CLIinstall/pi.md
Any other MCP hosto2b install --target generic --apply --out - prints the server entriesinstall/generic.md

o2b uninstall --target <name> --apply removes what o2b install wrote; the vault is never touched (install.md).

Capabilities

  • Preferences that learn and expire. Signals, a deterministic dream pass, confidence and retirement: how it works.

  • Reversible changes. Brain mutations take a snapshot first; o2b brain rollback restores it: snapshots.

  • Attributed writes. o2b brain writes lists every note write by agent and device, writes revert plans a restore, o2b brain freeze stops all writers, and o2b brain log verify checks the hash-chained log: Brain CLI.

  • Search. Keyword search with an optional semantic lane, result explanations, recall profiles and compact cards; an opt-in iterative loop (search_iterative_recall_enabled, default off) keeps querying when coverage gaps survive, pausing with a plan the caller answers through brain_search's round trip; and an opt-in per-source-session cap (search_pool_max_per_session, default off) keeps one long imported session from filling the candidate window, so diversity spreads across sessions: search CLI, iterative recall, pool cap, ranking.

  • Session recall. Import agent transcripts already on disk, search them, or select whole-thread coverage under a character budget (o2b brain session-grep --operation coverage --char-budget <n>, with --entity-key seeding the fan-out from mined entity mentions): session logs, coverage.

  • Hygiene. o2b brain hygiene scan finds contested, duplicate, stale and unused memories; apply runs only the findings you pick: maintenance.

  • Claim ledger. o2b brain truth ingest records an entity claim with an optional validity window (--valid-from/--valid-until; with the flags absent, a window on the source record's frontmatter is adopted and frozen at ingest), truth events recalls a windowed slice of the ledger, and truth state grounds an agent-stated claim with an anchoring verdict - committed, or reported back with reason codes. truth state accepts an optional opaque --sample-id naming the context-pack sample the claim drew on, and claim reads report the receipt and outcome provenance behind it at the caller's reach - "receipt known, outcome unknown", never an invented verdict: entity truth CLI.

  • Corrections. o2b brain lifecycle correct <target> reports a correction's blast radius and retires the affected records - validity-closed by default, tombstoned with --flatly-wrong, dry run by default and --apply to write. A retired record that recall can still serve is served only beside its correction, never alone: belief lifecycle CLI.

  • Sharing and backup. Knowledge packs export a chosen subset; o2b brain bank-export writes a one-file backup bundle: knowledge packs.

  • Secret custody. Credentials live encrypted in the vault's state dir behind a capability-gated store; $secret:NAME references resolve at the use sites, o2b brain secret unlock wraps the keyfile under a passphrase, and secret export/import move the store between installs as one passphrase-encrypted bundle: custody CLI.

  • Today view and note markers. o2b brain today, @osb loop and @osb set markers: Brain CLI.

  • Self-inspection. o2b version, o2b install --friction and o2b state status report what is installed and where state lives: CLI reference.

  • MCP surface. Tools, tool profiles for hosts with tool limits, and the always-loaded writer server: docs/mcp.md.

Optional features

  • Semantic search: an embedding provider plus sqlite-vec; the embeddings-setup skill walks through it: skills/embeddings-setup/SKILL.md.

  • Decision models: a typed judgment model that can rerank search and filter candidates, off by default per use: docs/decision-models.md.

  • Deep relational recall: a fourth search arm over typed links, off by default. Its traversal runs under width budgets - 8 seeds, 4 edges per node, 16 nodes in total, and a hub above 12 walked edges is reached but not expanded - each overridable through an OPEN_SECOND_BRAIN_SEARCH_TRAVERSAL_* environment variable or a search_traversal_* config key; entity co-occurrence bridges join the walk by default and switch off separately (OPEN_SECOND_BRAIN_SEARCH_ENTITY_BRIDGES): retrieval quality.

  • Staged review for agent writes, off by default. With no key set every write publishes exactly as before. write_approval.notes / OPEN_SECOND_BRAIN_WRITE_APPROVAL_NOTES_ENABLED and write_approval.ingest / OPEN_SECOND_BRAIN_WRITE_APPROVAL_INGEST_ENABLED (each falling back to the write_approval.enabled master, default off) stage note creates and ingest summary pages into Brain/pending/ beside the staged signals, where they stay out of the search index until an operator runs o2b brain pending list and applies or rejects them; write-path integrity.

  • A permissions document, absent by default. Brain/_permissions.yaml (an operator-edited vault file) resolves allow/ask/deny per agent, role and target for the write, ingest and owner-write actions; with the file absent every check behaves exactly as today. ask stages the write, deny refuses with the write-refused token and the next command o2b brain permissions show, and every ask/deny verdict lands in a queryable decision ledger under Brain/logs/decisions/; o2b brain permissions show dry-runs the decision table, ledger reads the rows; Brain CLI.

  • The owner-write gate, off by default. integrity.owner_scope_writes in Brain/_brain.yaml (off | warn | fail, default off) refuses a caller-named owner that differs from the caller's resolved identity on the preference and note lanes (warn allows and records one decision-ledger row); a document owner_write verdict composes most-restrictive-wins with the gate; write-time integrity.

  • Named MCP tokens, optional. o2b mcp token mint|rotate|revoke|list keeps a hash-at-rest token per agent (.open-second-brain/secrets/mcp-tokens.json; material shown exactly once). Over HTTP a valid token authenticates as its agent per request, the shared --api-key stays valid as the operator master credential, and mcp_tokens_required / OPEN_SECOND_BRAIN_MCP_TOKENS_REQUIRED (default false) makes a non-empty token map refuse credential-less requests. o2b bootstrap --target <harness> [--token] [--rotate] [--check] provisions MCP registration, token and receipt in one idempotent command, and o2b bootstrap --remove <harness> tears a provision down again; the minted token authenticates HTTP clients configured by hand, while the registered stdio harness presents no credential and keeps its config-derived identity; core CLI.

  • Ambient capture consent, opt-out. guardrails.ambient_writeback: false suppresses the ambient extraction lane with a counted ambient-withheld event (absent keeps today's behavior), and guardrails.ambient_ttl_days stamps an expiration_date on ambient-extracted signals so reads drop them after the window (absent stamps nothing); a TTL-stamped signal still stages when the review gate is on and survives apply verbatim.

  • Open decisions. o2b brain decision open --title <t> --question <q> --option <o> [...] parks a question with enumerated options at Brain/decisions/open-<slug>.md; resolve mints the real type: decision page, discard closes without deciding, and the morning brief renders up to five open questions: belief lifecycle.

What is new

Open Second Brain 1.98.0 is the agent-presence and self-improvement release. o2b install --target <host> --apply now writes the brain-usage block into the agent-instruction file the installed host reads at the vault root (AGENTS.md for codex, cursor, opencode and aider; GEMINI.md for gemini-cli) under the same consent prompt as the config writes, preserving every byte outside the block and recording its ownership so uninstall removes exactly the pair the tool wrote; the dream pass gains an operator-approved exit into those same files, where a lesson promotes into a managed lessons block only with a fresh approval pinned to the approved text, and the doctor grades every block state it can name. The skill lane gains a benchmark-gated rewrite loop: a skill is rewritten only after a candidate beats the incumbent on scored dev tasks with full coverage and survives the one held-out check - Open Second Brain never calls a model, the scorer reads structural predicates and nothing the agent claims about its own work, and the accept stays an operator step on the command line. And ChatGPT desktop is named where its operators look for it: it reads the shared Codex config, so one codex registration serves both. Every release is described in the CHANGELOG.

Documentation

TopicPage
Mental model, vault layout, dream pass, safety propertiesdocs/how-it-works.md
Every CLI verb and flagdocs/cli-reference.md
MCP protocol, tools, writer splitdocs/mcp.md
Brain store: setup, sync, migration, the human viewdocs/brain-store.md
Architecture and configuration modeldocs/architecture.md
Updating (o2b update) and upgrade notesdocs/updating.md
Observability eventsdocs/observability.md
Metrics data contractdocs/metrics.md
Cross-project pointerdocs/cross-project-pointer.md
Scheduled Brain digest (Hermes cron)docs/hermes-cron.md
Stability policydocs/stability.md
Origin of the ideadocs/idea.md

Project

CHANGELOG · Security policy · Source on GitHub · MIT License

docs/cross-project-pointer.md

Cross-project setup

When the coding work happens in a project directory that is not the Open Second Brain vault, the agent needs a pointer to find the vault on session start. This page describes the canonical snippet to drop into a project, the conventions around the vault's primary dream-running agent, and what changes when several devices share the same vault.

1. Add the pointer snippet to your project

Append the block below to one of the agent-prompt files your runtime reads on startup. Common targets:

  • CLAUDE.md — Claude Code.

  • AGENTS.md — Codex, Cursor, Aider, and other tools that follow the agents.md convention.

Pick one location per project. You can have Open Second Brain write and maintain this block for you instead of pasting it by hand: o2b install --target <host> --apply writes the managed block into the agent-instruction file your host reads at the vault root (AGENTS.md for codex, cursor, opencode and aider; GEMINI.md for gemini-cli), under an explicit consent prompt, keeping every byte outside the block intact on every re-run. The installed block merges the usage content below with the memory write gate, and a later uninstall removes exactly the pair the tool wrote. The manual snippet stays for hosts you provision by hand. Install only writes the vault-root instruction file of the target host; there, a pasted snippet or any hand edit inside the managed fences makes the run refuse with user-modified-block unless --force replaces it (a backup of the previous file is taken first).

Replace <absolute-vault-path> with the absolute path of your Obsidian-compatible vault before pasting.

# >>> open-second-brain managed >>>
## Open Second Brain

This project shares an Obsidian-compatible vault with an active
observing-memory layer. At session start, read the current
preferences:

    <absolute-vault-path>/Brain/active.md

Record taste signals via `brain_feedback` (MCP) or
`o2b brain feedback` (CLI). After producing a durable artifact, call
`brain_apply_evidence` with `result: applied | violated | outdated`
for any preference whose `scope` matches.

Do not run `o2b brain dream` from this runtime. The vault has a
primary dream-running agent declared in `<vault>/Brain/_brain.yaml`
(key `primary_agent`).
# <<< open-second-brain managed <<<

The snippet is intentionally short. The agent does not need configuration here — every operational detail lives in the vault itself (preferences, the active digest, the _brain.yaml config).

2. Primary agent and the dream cron

A shared vault has exactly one runtime responsible for running the deterministic dream consolidation pass. Declare that runtime in Brain/_brain.yaml:

o2b brain set-primary <agent-name> --vault <vault-path>

<agent-name> is the value of agent_name in ~/.config/open-second-brain/config.yaml on the host that runs the dream cron. To verify, run:

grep agent_name ~/.config/open-second-brain/config.yaml

When dream runs from a different agent, the response carries a structured warning:

  • The CLI prints warning: non-primary-dream-run: dream run from agent '<caller>', ... to stderr. Exit code stays 0.

  • The MCP brain_dream tool returns a warnings array containing { code: "non-primary-dream-run", message: "..." } alongside the usual summary.

  • The dream summary log event (Brain/log/<date>.md) gains a non_primary_agent: <caller> payload row so the breach is greppable in the audit trail.

The pass still completes — the declaration is observability, not access control. Pinning, rejecting, and toggling pins remain unrestricted: any agent on any device can mutate the protected set.

To clear the primary declaration (the vault becomes single-host again, or you want to disable the check during local experimentation):

o2b brain set-primary --clear --vault <vault-path>

A vault initialised with o2b brain init --primary-agent <name> writes the value into the fresh _brain.yaml on the first run; on re-runs against an existing file --primary-agent is ignored — use set-primary instead.

3. Multi-device through Syncthing

The vault is designed to be Syncthing-shared. Signals can be captured on any peer:

  • brain_feedback from a coding session on the laptop.

  • o2b brain feedback from a terminal.

  • @osb markers added by hand in Daily notes from the phone (captured later by o2b brain scan-inline on any peer).

All of these land in Brain/inbox/. The primary host's dream cron picks them up on the next pass, regardless of which peer wrote them. Use the primary_agent declaration to keep dream serialised to one host so signal processing does not race; the rest of the Brain layer is conflict-free because writes are append-only or locally-scoped (signals, daily logs, snapshots).

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Advantages

  • Human-readable and editable memory stored as standard Markdown files in an Obsidian vault. evidence: README.md
  • Deterministic dream pass ensures rules are derived from repeated signals without requiring additional model runs. evidence: README.md
  • Supports reversible changes through snapshots and rollback capabilities. evidence: README.md

Limitations

Security

Risk level: Low risk

This brain runs

MCP servers (2)

  • .claude-plugin/plugin.json (open-second-brain): ${CLAUDE_PLUGIN_ROOT}/scripts/o2b mcp --harness claude-code
  • .claude-plugin/plugin.json (open-second-brain-writer): ${CLAUDE_PLUGIN_ROOT}/scripts/o2b mcp --scope writer --harness claude-code

Git hooks (2)

  • .githooks/pre-commit (pre-commit): runs on git pre-commit
  • .githooks/pre-push (pre-push): runs on git pre-push

Agent instructions that run or fetch something (46)

  • CLAUDE.md: bun run scripts/sync-version.ts
  • CLAUDE.md: CI gates on `bun run scripts/sync-version.ts --check` (the `validate` job, step "Verify manifest version sync").
  • CLAUDE.md: Run the `--check` form locally before pushing a version change.
  • CLAUDE.md: Bump `package.json` (and run `sync-version.ts`) on the feature branch and include it in the SAME pull request as the feature, before you push.
  • CLAUDE.md: Bump `package.json` to `X.Y.Z` and run `bun run scripts/sync-version.ts`.
  • CLAUDE.md: After changing a skill or `hooks/hooks.json`, run:
  • CLAUDE.md: bun run sync-plugin-mirrors
  • CLAUDE.md: CI gates on `bun run sync-plugin-mirrors:check` (the `validate` and `windows` jobs), and the pre-commit hook runs the same check.
  • docs/legacy-skills/agent-event-log/SKILL.md: Read-only queries (running `git log`, `o2b status`, `vault_health`, `second_brain_query`).
  • docs/legacy-skills/agent-event-log/SKILL.md: **Technical identifiers stay verbatim regardless of surrounding language**: command names (`bun test`, `o2b doctor`), file paths (`src/core/event-log.ts`), package and library names (`proper-lockfile`, `@anthropic-ai/sdk`), API symbols, error messages quoted from logs.
  • plugins/codex/skills/brain-memory/SKILL.md: Read-only inspection (running `git log`, `o2b status`, `vault_health`).
  • plugins/codex/skills/brain-memory/SKILL.md: After scan, the source line becomes `@osb✓ [[sig-...]]` so a second run is idempotent.
  • plugins/codex/skills/codegraph-partner/SKILL.md: Run these checks in order.
  • plugins/codex/skills/codegraph-partner/SKILL.md: No install talk.
  • plugins/codex/skills/codegraph-partner/SKILL.md: | | not_indexed (CLI present, no `.codegraph/` or `initialized: false`) | Offer one line: "run `codegraph init <path>` to index this repo".
  • plugins/codex/skills/codegraph-partner/SKILL.md: Whenever you run `codegraph init` in any repository on the user's behalf, immediately read that repo's `.gitignore` and append a `.codegraph/` line if one is not already present.
  • plugins/codex/skills/decision-model-setup/SKILL.md: That is the operator's command, and only the operator can run it: the key is operator-only, so the `brain_settings` tool refuses an agent's write to it with `operator_only_setting` on every machine, switched or not.
  • plugins/codex/skills/decision-model-setup/SKILL.md: Ask the operator to run the command;
  • plugins/codex/skills/decision-model-setup/SKILL.md: Does not install servers or download model weights.
  • plugins/codex/skills/embeddings-setup/SKILL.md: Every run that uses it prints one stderr warning per endpoint.
  • plugins/codex/skills/embeddings-setup/SKILL.md: If the install path missed it, force a rebuild:
  • plugins/codex/skills/embeddings-setup/SKILL.md: bun pm ls | grep sqlite-vec
  • plugins/codex/skills/embeddings-setup/SKILL.md: bun install --force
  • plugins/codex/skills/embeddings-setup/SKILL.md: When the index already exists and only some chunks lack vectors, price the work first with the dry run, then apply it:
  • plugins/codex/skills/embeddings-setup/SKILL.md: Does not invoke `brew install` on the user's behalf.
  • plugins/codex/skills/schema-author/SKILL.md: Preview the batch first with `schema_apply_mutations` (`dry_run=true`) or `o2b brain schema apply --dry-run --mutation ...`: it returns the pack that would result and its diff and writes nothing at all - no config write, no audit record, no lock file.
  • plugins/codex/skills/schema-author/SKILL.md: It does not run the two checks that exist only because the apply writes: the vault-identity write guard, and the atomic writer's re-parse of the rendered YAML.
  • plugins/codex/skills/schema-author/SKILL.md: Re-run lint/stats after mutation and report changed tokens plus any remaining findings.
  • skills/brain-memory/SKILL.md: Read-only inspection (running `git log`, `o2b status`, `vault_health`).
  • skills/brain-memory/SKILL.md: After scan, the source line becomes `@osb✓ [[sig-...]]` so a second run is idempotent.
  • skills/codegraph-partner/SKILL.md: Run these checks in order.
  • skills/codegraph-partner/SKILL.md: No install talk.
  • skills/codegraph-partner/SKILL.md: | | not_indexed (CLI present, no `.codegraph/` or `initialized: false`) | Offer one line: "run `codegraph init <path>` to index this repo".
  • skills/codegraph-partner/SKILL.md: Whenever you run `codegraph init` in any repository on the user's behalf, immediately read that repo's `.gitignore` and append a `.codegraph/` line if one is not already present.
  • skills/decision-model-setup/SKILL.md: That is the operator's command, and only the operator can run it: the key is operator-only, so the `brain_settings` tool refuses an agent's write to it with `operator_only_setting` on every machine, switched or not.
  • skills/decision-model-setup/SKILL.md: Ask the operator to run the command;
  • skills/decision-model-setup/SKILL.md: Does not install servers or download model weights.
  • skills/embeddings-setup/SKILL.md: Every run that uses it prints one stderr warning per endpoint.
  • skills/embeddings-setup/SKILL.md: If the install path missed it, force a rebuild:
  • skills/embeddings-setup/SKILL.md: bun pm ls | grep sqlite-vec
  • skills/embeddings-setup/SKILL.md: bun install --force
  • skills/embeddings-setup/SKILL.md: When the index already exists and only some chunks lack vectors, price the work first with the dry run, then apply it:
  • skills/embeddings-setup/SKILL.md: Does not invoke `brew install` on the user's behalf.
  • skills/schema-author/SKILL.md: Preview the batch first with `schema_apply_mutations` (`dry_run=true`) or `o2b brain schema apply --dry-run --mutation ...`: it returns the pack that would result and its diff and writes nothing at all - no config write, no audit record, no lock file.
  • skills/schema-author/SKILL.md: It does not run the two checks that exist only because the apply writes: the vault-identity write guard, and the atomic writer's re-parse of the rendered YAML.
  • skills/schema-author/SKILL.md: Re-run lint/stats after mutation and report changed tokens plus any remaining findings.

Hooks (54)

  • hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" post-write-reminder; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook post-write-reminder; exit 0
  • hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
  • hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-agenda; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-agenda; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" backlog-nudge; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook backlog-nudge; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" log-catchup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook log-catchup; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" view-render; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook view-render; exit 0
  • hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" recall-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook recall-inject; exit 0
  • hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" nav-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook nav-inject; exit 0
  • hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" counterparty-brief; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook counterparty-brief; exit 0
  • hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
  • hooks/hooks.json (PreToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-orient; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-orient; exit 0
  • hooks/hooks.json (PreToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-host-backup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-host-backup; exit 0
  • hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" stop-log-guardrail; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook stop-log-guardrail; exit 0
  • hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" answer-quote-check; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook answer-quote-check; exit 0
  • hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" hygiene-digest; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook hygiene-digest; exit 0
  • hooks/hooks.json (SubagentStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
  • hooks/hooks.json (SubagentStop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (SessionEnd): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • hooks/hooks.json (SessionEnd): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-promote; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-promote; exit 0
  • hooks/hooks.json (PostCompact): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
  • hooks/hooks.json (PostCompact): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" post-write-reminder; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook post-write-reminder; exit 0
  • plugins/codex/hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
  • plugins/codex/hooks/hooks.json (PostToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-agenda; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-agenda; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" backlog-nudge; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook backlog-nudge; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" log-catchup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook log-catchup; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" view-render; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook view-render; exit 0
  • plugins/codex/hooks/hooks.json (SessionStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" recall-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook recall-inject; exit 0
  • plugins/codex/hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" nav-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook nav-inject; exit 0
  • plugins/codex/hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" counterparty-brief; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook counterparty-brief; exit 0
  • plugins/codex/hooks/hooks.json (UserPromptSubmit): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" reground-deliver; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook reground-deliver; exit 0
  • plugins/codex/hooks/hooks.json (PreToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-orient; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-orient; exit 0
  • plugins/codex/hooks/hooks.json (PreToolUse): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" pretool-host-backup; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook pretool-host-backup; exit 0
  • plugins/codex/hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" stop-log-guardrail; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook stop-log-guardrail; exit 0
  • plugins/codex/hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" answer-quote-check; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook answer-quote-check; exit 0
  • plugins/codex/hooks/hooks.json (Stop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" hygiene-digest; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook hygiene-digest; exit 0
  • plugins/codex/hooks/hooks.json (SubagentStart): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" subagent-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook subagent-inject; exit 0
  • plugins/codex/hooks/hooks.json (SubagentStop): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (SessionEnd): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0
  • plugins/codex/hooks/hooks.json (SessionEnd): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" gap-promote; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook gap-promote; exit 0
  • plugins/codex/hooks/hooks.json (PostCompact): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" active-inject; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook active-inject; exit 0
  • plugins/codex/hooks/hooks.json (PostCompact): r="$CLAUDE_PLUGIN_ROOT"; if [ -n "$r" ] && [ -x "$r/scripts/o2b-hook" ]; then exec "$r/scripts/o2b-hook" session-capture; fi; command -v o2b-hook >/dev/null 2>&1 && exec o2b-hook session-capture; exit 0

Package scripts (1)

  • package.json (prepare): bun scripts/prepare.ts || exit 0
  • Low risk: scripts-present (.githooks/pre-commit)
  • Low risk: scripts-present (.githooks/pre-push)
  • Low risk: network-instructions (plugins/codex/skills/codegraph-partner/SKILL.md:115)
  • Low risk: scripts-present (scripts/prepare.ts)
  • Low risk: network-instructions (skills/codegraph-partner/SKILL.md:115)

Attribution and licence

First committed by
GitHub avatar of hermes-vps-agenthermes-vps-agent
Declared authors
  • Open Second Brain contributors (declared in .claude-plugin/plugin.json)
  • Open Second Brain contributors (declared in pyproject.toml)
Publisher
Serg Eroshe (Community)
Source
itechmeat/open-second-brain · commit 233b91d
Licence
MIT License (files served here)
  • ATTRIBUTION.md (written by AutoGineer)
Synced
Contributors
solaitken, itechmeat, Yori940619, hermes-vps-agent, DanBennettUK

AutoGineer is not affiliated with or endorsed by hermes-vps-agent or Serg Eroshe.

Install from source

486 of its files are not served here, so there is no ZIP. itechmeat/open-second-brain at 233b91d