---

Quickstart

pip install unisonlabs
export UNISON_TOKEN=usk_live_...

from unisonlabs import UnisonBrain

client = UnisonBrain()                                          # reads UNISON_TOKEN env var
results = client.search("architecture decisions", limit=5)      # hybrid search
doc = client.write("/private/notes/my-note.md", "# Note\n...")  # write
doc2 = client.get("/private/notes/my-note.md")                  # read back
print(doc2.body)

AI agents: read AGENTS.md — install, auth with a usk_ key, and the search-first / write-back loop in four steps.

MCP Server

Use the Unison brain MCP server to give AI assistants direct access to your brain:

{
  "mcpServers": {
    "unison-brain": {
      "command": "npx",
      "args": ["-y", "@unisonlabs/mcp"],
      "env": {
        "UNISON_TOKEN": "usk_live_...",
        "UNISON_API_URL": "https://brain.unisonlabs.ai"
      }
    }
  }
}

Installation

pip install unisonlabs

Python 3.9 or higher required.

Environment variables

Variable	Default	Description
UNISON_TOKEN	required	Your usk_live_... API token
UNISON_API_URL	https://brain.unisonlabs.ai	Base URL for the brain API

Usage

Synchronous

import os
from unisonlabs import UnisonBrain

client = UnisonBrain(
    token=os.environ.get("UNISON_TOKEN"),  # default — can be omitted
)

# Confirm auth and check scopes
me = client.whoami()
print(me.user.email, me.scopes)

# Search (hybrid keyword + semantic)
results = client.search("architecture decisions", limit=5)
for hit in results.results:
    print(f"[{hit.score:.2f}] {hit.doc.path}")

# Read a document
doc = client.get("/workspace/projects/architecture.md")
print(doc.body)

# Write a document
# Writable roots: /private/..., /workspace/...
doc = client.write(
    "/private/notes/my-note.md",
    "# My Note\n\nContent here.",
    title="My Note",
    tags=["draft"],
)

# Surgical edit (old_str must match exactly once)
client.edit_doc("/private/notes/my-note.md", "Content here.", "Updated content.")

# Entity graph
resp = client.entities.resolve("Alice")
if resp.entity:
    facts = client.entities.facts(resp.entity.id)

# Record a fact
client.facts.record(
    subject_id="entity-id",
    predicate="works_at",
    fact_text="Joined Unison in 2026",
    confidence=0.9,
)

# Brain status
status = client.status()
print(f"{status.docCount} docs, {status.entityCount} entities")

client.close()

Async

import asyncio
from unisonlabs import AsyncUnisonBrain

async def main() -> None:
    async with AsyncUnisonBrain() as client:
        results = await client.search("auth decision", limit=3)
        for hit in results.results:
            print(hit.doc.path)

asyncio.run(main())

Context manager

with UnisonBrain() as client:
    doc = client.get("/workspace/notes/foo.md")

with_options

fast_client = client.with_options(timeout=10.0, max_retries=0)

Headless machine auth (no browser)

Three-step flow to provision a token programmatically:

import httpx

# Step 1 — provision (creates an unverified account + returns a usk_ key)
resp = httpx.post(
    "https://brain.unisonlabs.ai/v1/auth/provision",
    json={"email": "agent@example.com"},
)
api_key = resp.json()["apiKey"]  # immediately usable (unverified, 72h expiry)

# Step 2 — verify with the OTP emailed to agent@example.com
from unisonlabs import UnisonBrain
client = UnisonBrain(token=api_key)
verify_resp = client.auth.verify("agent@example.com", input("OTP: "))
# Workspace is now durable; key never expires unless rotated

# Key recovery (already-verified accounts)
client.auth.request_key("agent@example.com")
new_key_resp = client.auth.verify("agent@example.com", input("Recovery OTP: "))
print(new_key_resp.apiKey)

API Reference

client.documents

Method	Description
search(q, *, k, kind, tag, memory_type, as_of)	Hybrid search
grep(pattern, *, case_sensitive, limit)	Regex scan over document bodies
get(path)	Read a document (includes body)
write(path, body_md, *, kind, title, tldr, tags, visibility, ...)	Write/create a document
edit(path, old_str, new_str)	Surgical in-place edit
delete(path)	Delete a document
tag(path, *, add, remove)	Add/remove tags
share(*, kind, id)	Promote private to workspace-visible
list(*, prefix, kind, tag, limit)	List documents
fs_list(path)	Directory listing
fs_read(path)	Raw content (including read-only tiers)
neighbors(id_or_path, *, kind, limit)	Graph neighbours
status()	Health + counts

client.entities

Method	Description
list(*, kind, status, limit)	List entities
resolve(name, *, kind_hint)	Find by name (fuzzy+alias)
get(entity_id)	Get one entity
upsert(kind, display_name, *, slug, aliases, props, status)	Create or update
facts(entity_id, *, as_of, include_invalidated)	Facts about an entity
timeline(entity_id, *, from_, to)	Chronological facts

client.facts

Method	Description
list(*, limit, include_invalidated)	Browse all facts
record(subject_id, predicate, fact_text, *, ...)	Record a new fact
correct(fact_id, **fields)	Correct/supersede a fact
invalidate(fact_id)	Soft-delete (sets validTo=now)

client.links

Method	Description
list(*, limit)	List directed graph edges
create(from_id, to_id, kind)	Create a link

client.auth

Method	Description
whoami()	Confirm auth + check scopes
provision(email)	Headless account creation
verify(email, code)	Verify OTP / key recovery
request_key(email)	Request recovery OTP
device_code(client_id, scope?)	Start device flow
device_token(device_code)	Poll device flow
exchange_code(code, code_verifier, redirect_uri, client_id)	PKCE exchange

client.review (requires brain:admin)

Method	Description
conflicts()	Pending dedup merge pairs
resolve_conflict(conflict_id, verdict)	'merge' or 'distinct'
merges(*, limit)	Recent merges (undo feed)
undo_merge(merge_id)	Enqueue unmerge

client.jobs (requires brain:admin)

Method	Description
list(*, status, kind, limit)	Job queue visibility
stats()	Job counts by status
retry(job_id)	Re-queue failed job

Brain FS contract

All document paths must end in .md. Writable roots:

Root	Visibility
/private/...	Private to the calling user
/workspace/...	Entire workspace (use workspace/teams/<slug>/ for team folders)

Unqualified paths (no leading /) are automatically rewritten to /private/notes/<slug>.md. Invalid roots (/actions/, /raw/, /teams/, unknown namespaces) raise BrainContractError before any network call.

Error handling

import unisonlabs

try:
    doc = client.get("/workspace/missing.md")
except unisonlabs.NotFoundError as e:
    print(f"404: {e.message}")
except unisonlabs.AuthenticationError:
    print("Invalid token")
except unisonlabs.RateLimitError:
    print("Rate limited — back off")
except unisonlabs.APIConnectionError as e:
    print(f"Connection failed: {e}")

Status	Exception
400	BadRequestError
401	AuthenticationError
403	PermissionDeniedError
404	NotFoundError
409	ConflictError
422	UnprocessableEntityError
429	RateLimitError
>=500	InternalServerError
network	APIConnectionError
timeout	APITimeoutError

Retries

The client retries 2 times by default with exponential backoff on connection errors, timeouts, and 408/409/429/5xx responses.

client = UnisonBrain(max_retries=0)  # disable retries

Star history

Releasing

Set a PyPI token — either configure ~/.pypirc or export:

export TWINE_USERNAME=__token__
export TWINE_PASSWORD=pypi-...

Then:

python3 scripts/release.py

Builds, publishes unisonlabs to PyPI (idempotent — skips if the version is already live), then tags and pushes v<version>.

Contributing

Open issues and pull requests at github.com/unison-labs-ai/python-sdk. See CONTRIBUTING.md for development setup, conventions, and PR guidelines. Security issues: email security@unisonlabs.ai — do not open a public issue.

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Part of the Unison Labs constellation

One brain, every agent. Every repo below reads from and writes to the same Unison brain — no per-tool memory silos.

Repo	What it does
unison-brain	CLI · SDK · MCP server — the core
claude-unison	Memory for Claude Code
cursor-unison	Memory for Cursor
codex-unison	Memory for OpenAI Codex CLI
opencode-unison	Memory for OpenCode
openclaw-unison	Memory for OpenClaw
pipecat-unison	Memory for Pipecat voice agents
python-sdk ← you are here	Python SDK for the brain
install-mcp	One-command MCP installer
code-chunk	AST-aware code chunking
unison-fs	Mount the brain as a filesystem
backchannel	Async messaging between agents
Unison-evals	Open memory benchmark suite