brainctl 1.5.2

Context engineering for AI agents — persistent memory, knowledge graph, affect tracking, and MCP server. Single SQLite file, zero LLM cost.

brainctl

Your AI agent forgets everything between sessions. brainctl fixes that.

One SQLite file gives your agent persistent memory — what it learned, who it talked to, what decisions were made, and why. No server. No API keys. No LLM calls.

from agentmemory import Brain

brain = Brain(agent_id="my-agent")

# Start of session — get full context in one call
context = brain.orient(project="api-v2")
# → {'handoff': {...}, 'recent_events': [...], 'triggers': [...], 'memories': [...]}

# During work
brain.remember("API rate-limits at 100 req/15s", category="integration")
brain.decide("Use Retry-After for backoff", "Server controls timing", project="api-v2")
brain.entity("RateLimitAPI", "service", observations=["100 req/15s", "Retry-After header"])

# End of session — preserve state for next agent
brain.wrap_up("Documented rate limiting, auth module complete", project="api-v2")

Next session, a different agent (or the same one) picks up exactly where you left off.

Install

pip install brainctl

That's it. No dependencies beyond Python 3.11+ and SQLite (built-in). Optional extras:

pip install brainctl[mcp]         # MCP server for Claude Desktop / VS Code
pip install brainctl[vec]         # vector similarity search (sqlite-vec + Ollama)
pip install brainctl[all]         # everything

Upgrading

Fresh installs: nothing to do. pip install brainctl and your first Brain() call creates a brain.db with the full current schema.

Upgrading an existing brain.db: brainctl tracks schema migrations in a schema_versions table. After upgrading:

cp $BRAIN_DB $BRAIN_DB.pre-upgrade     # always back up first
brainctl doctor                         # diagnose migration state
brainctl migrate                        # apply anything pending

If brainctl doctor reports everything green, you're done.

Predating the tracker — "virgin tracker + schema drift"

If your brain.db existed before the migration tracking framework was introduced, schema_versions will be empty but your schema already has the effects of many migrations. Running brainctl migrate blindly in that state will crash on the first ALTER TABLE ADD COLUMN that collides with an existing column — SQLite has no IF NOT EXISTS for column adds.

brainctl doctor detects this state and prints:

  migrations: virgin tracker + 5 ad-hoc schema hits — DANGEROUS to run `brainctl migrate` directly
    1. brainctl migrate --status-verbose   (see which migrations are truly pending)
    2. apply truly-pending ones manually via sqlite3
    3. brainctl migrate --mark-applied-up-to N (backfill the rest)
    4. brainctl migrate   (run anything above N)

Full recovery workflow:

# 1. Back up. Always.
cp $BRAIN_DB $BRAIN_DB.pre-migrate

# 2. Get a per-migration heuristic report.
#    Each migration is classified as:
#      likely-applied → all expected columns/tables exist
#      partial        → some DDL applied, some missing (actual drift)
#      pending        → none of its DDL exists (genuinely needs to run)
#      unknown        → no introspectable DDL (UPDATE-only or DROP-only)
brainctl migrate --status-verbose

# 3. For each migration in 'pending' or 'partial', apply it manually.
#    This is the safe path because you see exactly what each statement does.
sqlite3 $BRAIN_DB < db/migrations/024_confidence_alpha_beta_wiring.sql
sqlite3 $BRAIN_DB < db/migrations/028_memory_quarantine.sql
# ... etc

# 4. Backfill the tracker so future `brainctl migrate` runs skip
#    what's already applied. Pick N = highest version you've verified.
brainctl migrate --mark-applied-up-to 31

# 5. Run anything above N (e.g. migration 032 drops dead tables)
brainctl migrate

--mark-applied-up-to N writes rows to schema_versions with a (backfilled) suffix on the name so you can tell them apart from "really ran" rows. It refuses to go below the current high-water mark (guards against rewriting tracker state you've already committed to).

Rollback: if a migration run breaks something, cp $BRAIN_DB.pre-migrate $BRAIN_DB gets you back. brain.db is a single SQLite file — no out-of-band state to worry about.

Quick Start

Python API

from agentmemory import Brain

brain = Brain()                    # creates ~/agentmemory/db/brain.db automatically

brain.remember("User prefers dark mode", category="preference")
brain.search("dark mode")          # FTS5 full-text search with stemming

brain.entity("Alice", "person", observations=["Engineer", "Likes Python"])
brain.relate("Alice", "works_at", "Acme")

brain.log("Deployed v2.0", event_type="result", project="myproject")
brain.decide("Keep JWT expiry at 24h", "Security vs UX balance")

brain.trigger("deploy fails", "deploy,failure,502", "Check rollback procedure")
brain.doctor()                     # {'healthy': True, 'active_memories': 5, ...}

CLI

brainctl memory add "Auth uses JWT with 24h expiry" -c convention
brainctl search "auth"
brainctl entity create "Alice" -t person -o "Engineer"
brainctl entity relate Alice works_at Acme
brainctl event add "Deployed v2.0" -t result -p myproject
brainctl trigger create "deploy issue" -k deploy,failure -a "Check rollback"
brainctl stats

MCP Server (Claude Desktop / VS Code / Cursor)

{
  "mcpServers": {
    "brainctl": {
      "command": "brainctl-mcp"
    }
  }
}

196 tools available. See MCP_SERVER.md for the full list and a decision tree showing which tools to use when.

The Drop-In Pattern

Any agent, any framework. Three lines:

context = brain.orient()           # session start: handoff + events + triggers + memories
# ... do work ...
brain.wrap_up("what I accomplished")  # session end: logs event + creates handoff

orient() returns a single dict with everything the agent needs: pending handoff from the last session, recent events, active triggers, relevant memories, and stats. wrap_up() creates a handoff packet so the next session can resume.

See examples/ for runnable scripts and docs/AGENT_ONBOARDING.md for the full agent integration guide.

Framework Integrations

LangChain

pip install brainctl langchain-core

from agentmemory.integrations.langchain import BrainctlChatMessageHistory
from langchain_core.runnables.history import RunnableWithMessageHistory

chain_with_history = RunnableWithMessageHistory(
    runnable=my_chain,
    get_session_history=lambda sid: BrainctlChatMessageHistory(session_id=sid),
)

Chat messages persist in brain.db. The Brain instance is accessible via history.brain for knowledge operations beyond chat (entities, decisions, triggers, search).

CrewAI

pip install brainctl crewai

from crewai import Crew
from crewai.memory import ShortTermMemory, LongTermMemory, EntityMemory
from agentmemory.integrations.crewai import BrainctlStorage

crew = Crew(
    agents=[...], tasks=[...], memory=True,
    short_term_memory=ShortTermMemory(storage=BrainctlStorage("short-term")),
    long_term_memory=LongTermMemory(storage=BrainctlStorage("long-term")),
    entity_memory=EntityMemory(storage=BrainctlStorage("entity")),
)

All crew memory goes to a single brain.db. FTS5 search out of the box, optional vector search with pip install brainctl[vec].

Agent harness plugins

First-party plugins that drop brainctl into agent-runner environments as persistent memory:

Plugin	Target	What it does	Install
plugins/claude-code/brainctl/	Claude Code	Hooks into SessionStart / UserPromptSubmit / PostToolUse / SessionEnd — orient on start, wrap_up on end, capture events during work	python3 plugins/claude-code/brainctl/install.py
plugins/codex/brainctl/	OpenAI Codex CLI	Idempotent merge of [mcp_servers.brainctl] into ~/.codex/config.toml + AGENTS.md.template for session bookends. Exposes the full 196-tool surface	python3 plugins/codex/brainctl/install.py
plugins/hermes/brainctl/	Hermes Agent	Full MemoryProvider with auto-recall, auto-retain, orient/wrap_up bookends, and MEMORY.md/USER.md mirroring. Upstream bundling: NousResearch/hermes-agent#9246	hermes memory setup → brainctl
plugins/eliza/brainctl/	Eliza	TypeScript plugin (@brainctl/eliza-plugin) — spawns brainctl-mcp as a subprocess, exposes six actions (BRAINCTL_REMEMBER / SEARCH / ORIENT / WRAP_UP / DECIDE / LOG) plus an auto-recall memory provider	npm install @brainctl/eliza-plugin

Trading-strategy plugins

Strategy-mixin plugins that give algorithmic trading frameworks persistent memory across backtests and live runs:

Plugin	Target	What it does
plugins/freqtrade/brainctl/	Freqtrade	StrategyBrain mixin — remembers indicator states, logs trade decisions, correlates backtest vs live outcomes
plugins/jesse/brainctl/	Jesse	Same shape as the Freqtrade plugin, adapted to Jesse's strategy API

Python API (21 methods)

Method	What it does
remember(content, category)	Store a durable fact
search(query)	FTS5 full-text search with stemming
vsearch(query)	Vector similarity search (optional)
forget(memory_id)	Soft-delete a memory
entity(name, type)	Create or get an entity
relate(from, rel, to)	Link two entities
log(summary, type)	Log a timestamped event
decide(title, rationale)	Record a decision with reasoning
trigger(condition, keywords, action)	Set a future reminder
check_triggers(query)	Match triggers against text
handoff(goal, state, loops, next)	Save session state
resume()	Fetch + consume latest handoff
orient(project)	One-call session start
wrap_up(summary)	One-call session end
doctor()	Diagnostic health check
consolidate()	Promote important memories
tier_stats()	Write-tier distribution
stats()	Database overview
affect(text)	Classify emotional state
affect_log(text)	Classify + store emotional state

Core Concepts

Memories — Durable facts with categories that control their natural decay rate. Identity lasts a year; integration details fade in a month. Recalled memories get reinforced.

Events — Timestamped logs of what happened. Append-only. Searchable by type and project.

Entities — Typed nodes (person, project, tool, service) with observations. Form a self-building knowledge graph — when a memory mentions a known entity, the link is created automatically.

Decisions — Title + rationale. The "why" record. Prevents future agents from unknowingly contradicting prior choices.

Triggers — Prospective memory. "When X comes up, remind me to do Y." Fire on keyword match during search.

Handoffs — Working state packets for session continuity. Goal, current state, open loops, next step.

What Makes It Different

Feature	brainctl	mem0	Zep	MemGPT
Single file (SQLite)	yes	-	-	-
No server required	yes	yes	-	-
No LLM calls	yes	-	yes	-
MCP server included	yes	-	-	-
Full-text search (FTS5)	yes	-	-	-
Vector search	yes	yes	yes	yes
Knowledge graph	yes	-	yes	-
Self-building graph	yes	-	-	-
Confidence decay	yes	-	-	-
Duplicate suppression	yes	-	-	-
Write gate (surprise scoring)	yes	-	-	-
Consolidation engine	yes	-	-	-
Prospective memory (triggers)	yes	-	-	-
Session handoffs	yes	-	-	-
Multi-agent support	yes	-	yes	-
Affect tracking	yes	-	-	-
Model-agnostic	yes	-	yes	-

Multi-Agent

Every operation accepts agent_id for attribution. Agents share one brain.db. Search sees everything. The knowledge graph connects insights across agents automatically.

researcher = Brain(agent_id="researcher")
deployer = Brain(agent_id="deployer")

researcher.remember("Auth uses bcrypt cost=12", category="convention")
deployer.search("bcrypt")  # finds researcher's memory

Context Profiles

Context profiles are task-scoped search presets. Instead of manually specifying --tables and --category on every query, name the task and brainctl loads only what's relevant.

brainctl search "voice" --profile writing     # memories: preference, convention, lesson
brainctl search "Sarah" --profile meeting     # contacts + interaction history + project context
brainctl search "JWT" --profile research      # technical knowledge + integrations
brainctl search "deploys" --profile ops       # events + decisions + project memories
brainctl search "founders" --profile networking  # entities (person, org) only
brainctl search "Q1" --profile review         # retrospective: lessons, decisions, projects

Works in MCP too:

{ "tool": "memory_search", "query": "tone of voice", "profile": "writing" }
{ "tool": "search", "query": "auth system", "profile": "research" }

List all profiles, create your own, or delete custom ones:

brainctl profile list
brainctl profile show writing
brainctl profile create coderev \
  --categories convention,lesson \
  --tables memories,events \
  --description "Code review context"
brainctl profile delete coderev

Built-in profiles:

Profile	Tables	Categories
writing	memories, entities	preference, convention, lesson
meeting	memories, events, entities	user, project, preference
research	memories, entities	integration, convention, lesson, environment
ops	memories, events, decisions	project, decision, lesson
networking	entities, memories	user
review	memories, events, decisions	lesson, decision, project

Profiles never override explicit --tables or --category flags — they're defaults, not locks.

Obsidian Integration

Bidirectional sync between brain.db and an Obsidian vault:

pip install brainctl[obsidian]
brainctl obsidian export ~/Documents/MyVault    # brain → markdown + wikilinks
brainctl obsidian import ~/Documents/MyVault    # new notes → brain (through write gate)
brainctl obsidian watch ~/Documents/MyVault     # auto-sync on file changes
brainctl obsidian status ~/Documents/MyVault    # drift report

Memory Lifecycle

brainctl manages memories like biological memory:

• Write gate — Surprise scoring rejects redundant writes. Bypass with force=True.
• Three-tier routing — High-value memories get full indexing; low-value get lightweight storage.
• Duplicate suppression — Near-duplicates reinforce existing memories instead of creating new ones.
• Half-life decay — Unused memories fade based on category. Recalled memories get reinforced.
• Hard cap — 10,000 per agent. Emergency compression retires lowest-confidence memories.
• Consolidation — Batch maintenance: Hebbian learning, temporal promotion, compression. Schedule with cron.

Health & Diagnostics

brain.doctor()    # table checks, integrity, vec availability, DB size

brainctl stats    # database overview
brainctl lint     # quality issues (low confidence, duplicates, orphans)
brainctl lint --fix  # auto-fix safe issues
brainctl cost     # token usage dashboard

Token Cost Optimization

brainctl search "deploy" --output oneline   # ~60 tokens (~97% savings vs JSON)
brainctl search "deploy" --budget 500       # hard token cap
brainctl search "deploy" --limit 3          # fewer results

Vector Search (Optional)

Works without embeddings. For semantic similarity:

pip install brainctl[vec]
ollama pull nomic-embed-text       # install Ollama first: https://ollama.ai
brainctl embed populate            # backfill embeddings
brainctl vsearch "semantic query"

Docker

docker build -t brainctl .
docker run -v ./data:/data brainctl                    # MCP server
docker run -v ./data:/data brainctl brainctl stats     # CLI

Documentation

Doc	What it covers
Agent Onboarding Guide	Step-by-step integration for agents
Agent Instructions	Copy-paste blocks for MCP, CLI, Python agents
MCP Server Reference	196 tools with decision tree
Architecture	Technical deep-dive
Cognitive Protocol	The Orient-Work-Record pattern
Examples	Runnable scripts (quickstart, lifecycle, multi-agent)
Contributing	Development setup and PR workflow

License

MIT