Synthigy Python SDK

Thin, zero-dependency (stdlib-only) client for Synthigy's /data endpoint. ONE engine, async-native: everything runs on an asyncio core (AsyncClient) — hand-rolled keep-alive HTTP/1.1 pool, one multiplexed SSE connection, watches as suspended coroutines. The blocking Client (and every module-level verb) is a thin facade over that engine driving a single background event-loop thread — same API scripts and notebooks always had, ~1 extra thread total no matter how many watches are open. Python ≥ 3.10.

Install

pip install synthigy        # or: uv add synthigy

No runtime dependencies to resolve. The wheel also installs the synthigy-gen codegen CLI (equivalently python3 -m synthigy.codegen).

Hello world

import synthigy
from synthigy import eq, gt, rel

synthigy.connect("https://synthigy.example.com",
                 client_id="my-service",
                 client_secret=os.environ["SYNTHIGY_SECRET"])

users = synthigy.search("User",
    {"active": eq(True), "age": gt(18), "_limit": 10,
     "_order_by": [["name", "asc"]]},
    {"name": None, "email": None, "roles": {"name": None}},
    acting_as=user_xid)

One process, one client

connect() installs a module-wide default — any previous default is destroyed first (watches close, SSE drops). All module-level verbs operate on it. Identity is multiplexed per-call via acting_as=, never a second connect. Constructing synthigy.Client(...) directly is the escape hatch for tests.

Async-first (BFFs, FastAPI/uvicorn services)

The async surface IS the engine — no thread hops, native cancellation:

synthigy.aconnect(endpoint, client_id=..., client_secret=SECRET)  # once
c = synthigy.aclient()

rows = await c.search("Order", {"status": eq("open")}, {"total": None},
                      acting_as=user.xid)
await c.stack("Order", {"xid": oxid, "note": "expedite"}, acting_as=user.xid)

@app.get("/orders/stream")
async def stream(user=Depends(current_user)):
    async def gen():
        async with c.watch_query("order", acting_as=user.xid) as w:
            yield render(w.list())
            async for ev in w:            # derived query/* events
                yield render(w.list())
    return StreamingResponse(gen(), media_type="text/event-stream")

Request teardown is task cancellation in asyncio; watch cleanup is cancellation-safe by design (async with guarantees close, close never awaits). An open watch costs a buffer on the shared SSE connection — not a thread, not a second connection.

AsyncClient/Client are themselves context managers too (like httpx.AsyncClient/httpx.Client) — async with AsyncClient(...) as c: / with Client(...) as c: close everything on scope exit, exception or not. aconnect/connect (the module-default singleton) stay the norm for long-lived processes; the context-manager form is for scripts and one-off scoped clients (tests, short jobs).

The blocking Client below is for scripts/seeds/notebooks; don't call it from a coroutine (it blocks the loop, and calling it from its own loop thread raises).

Reads

rows  = synthigy.search("Movie", {"_limit": 5}, {"title": None})
movie = synthigy.get("Movie", {"xid": "m-1"}, {"title": None})   # flat unique-key args
rows  = synthigy.sql_template(
    "SELECT COUNT(*) AS n FROM {movie} WHERE {movie.release_year} > ?", [1990])

# XSQL — string query surface (server parses/compiles; GraphQL model)
rows = synthigy.query("""
movie (release_year > ?y:int, _limit 10)
  title
  ->genres
    name
""", {"y": 1990})

• Operators: eq neq gt gte lt lte in_ nin like ilike is_null is_not_null and and_ / or_ / not_ (Python-keyword renames of the JS and/or/not/in).
• Selections mirror the shape you want back: None = scalar, nested dict = relation. The server's join default is LEFT — a projected relation never drops its parent, and relation args filter the related rows. To scope parents to those HAVING the relation, be explicit: rel({...}, args={"_join": "inner"}). The SDK injects nothing.
• Empty relations are omitted by the wire, never [] — use row.get("genres", []).
• Counting/aggregation has no dedicated op: use sql_template or XSQL _count/_agg selections.

Writes

synthigy.sync("Movie", {"xid": "m-1", "title": "Dune",
                        "genres": [{"xid": "g-scifi"}]})   # upsert, REPLACES link-sets
synthigy.stack("user_rating", {"value": 5, "movie": {"xid": "m-1"}})  # additive
synthigy.slice("Movie", {"xid": "m-1"}, {"genres": [{"xid": "g-scifi"}]})  # unlink
synthigy.delete("Movie", {"xid": "m-1"})                   # soft delete
synthigy.purge("user_rating", {"value": {"_lt": 2}})        # hard delete by filter

Writes are silent by default — sync/stack answer {"count": n}, not the record. Mint the id up front when you need it; that is cheaper than the echo and makes a retried write idempotent rather than duplicating a row:

from synthigy import new_xid

xid = new_xid()                                     # 22-char Base58
synthigy.sync("Movie", {"xid": xid, "title": "Dune"})          # -> {"count": 1}
synthigy.sync("Movie", {"xid": xid, "title": "Dune"},
              returning=True)                       # -> the written record

Batch heterogeneous ops in one round trip:

from synthigy import ops
results = synthigy.exec_([
    ops.slice("User", {"xid": u}, {"roles": [{"xid": old}]}),
    ops.stack("User", {"xid": u, "roles": [{"xid": new}]}),
], acting_as=user_xid)

Live data

The blessed pattern is notify-then-refetch: events are pokes; the SDK re-runs the query through the IAM-filtered read path, so RLS is enforced on every refetch.

w = synthigy.watch_query("Order", {"status": eq("open")}, {"total": None},
                         acting_as=user_xid)
w.ready()
for ev in w.events():        # blocking iterator; break to stop
    if ev["type"] in ("query/added", "query/changed", "query/removed"):
        render(w.list())

w2 = synthigy.watch_sql_template(
    "SELECT COUNT(*) AS n FROM {task}", entities=["task"])
w2.ready(); print(w2.first())

Lower-level: watch(interest) (records/entities/relations, shaped record/relation deltas with computed changed), watch_schema(), listen() (raw SSE envelopes), observe(descriptor, backfill=True) (one-call subscribe + reconnect + /history gap replay). One SSE connection per client — all watches fuse onto it. keep_alive=True on connect pins the SSE open across watch churn (BFFs).

Raw subscription calls (subscribe/set_subscriptions/...) exist but the server set is per-identity full-replace — raw calls clobber a live watch multiplexer's union. Prefer the watch family.

History

h = synthigy.history()
h.events(record_xid=xid)                  # recent events up to now
h.get_at(xid, "2026-01-01T00:00:00Z")
h.diff(xid, t1, t2)

Raises HISTORY_UNAVAILABLE when the server has no audit provider.

Errors

Everything raises synthigy.SynthigyError with stable .code, derived .category (auth | iam | validation | not_found | conflict | rate_limit | network | internal) and .retryable. Structured fields when the server sends them: .hint, .entity, .path, .line/.col, .diagnostics, .request_id (matches the X-Request-Id the SDK sends — correlate with server logs). Discriminate on .code, never the message.

Auth

• Client credentials (client_id+client_secret): tokens minted from /oauth/token, cached per audience, refreshed 30s before expiry, single-flight; one automatic clear-and-retry on 401.
• audience= (or $SYNTHIGY_AUDIENCE): binds one audience to every mint this client makes. The platform's audience model is opt-in by design — a token minted naming no audience resolves to an identity-only audience that /data rejects, so without this every data call 401s. Set it to the server's /data audience, published at /.well-known/synthigy as auth.oidc.audience. Left unset the SDK names no audience, so an unentitled client keeps a soft 401 rather than a hard invalid_target. client.token(audience) still overrides per call, for minting tokens aimed at a different audience.
• Static token="..." for scripts/tests (token="" for authless dev).
• With none of the above, resolution continues: under SYNTHIGY_SUPERVISED=1 the SDK asks its supervising parent (synthigy exec/agent, or a robotics commander) for a token over the process's own stdio, then falls back to the SYNTHIGY_TOKEN env var, then raises SynthigyError(code="NO_TOKEN") with a message that teaches the fix. The pipe beats the env var deliberately: exec injects the cached token and supervises, and only the pipe can refresh mid-run. A bot written as synthigy.Client(endpoint) — nothing else — therefore runs unchanged bare, under exec, and under a production commander. See docs/plans/PLAN-EXEC-IDENTITY.md.
• acting_as is server-verified impersonation for trusted confidential clients (the BFF model) — the SDK never handles end-user OAuth redirects.

Codegen

python3 -m synthigy.codegen turns an .xsql operations document + the server schema into one typed Python module (TypedDict rows/params/inputs + functions over the module-level verbs). The server owns the XSQL grammar — op:"describe" compiles the source and returns a language-neutral IR; the emitter renders Python from IR JSON and parses nothing.

# 1. Pull the IAM-filtered schema (commit it)
SYNTHIGY_CLIENT_ID=... SYNTHIGY_CLIENT_SECRET=... \
  python3 -m synthigy.codegen pull http://localhost:7887 schema.json

# 2. Describe + generate (saves movies.ir.json beside the .xsql — commit
#    schema.json + .xsql + .ir.json; after that gen runs OFFLINE forever)
python3 -m synthigy.codegen gen movies.xsql          # → movies_gen.py

# 3. CI drift gate: offline sourceHash check ("edited .xsql, forgot
#    codegen"); live describe-diff when SYNTHIGY_* creds are present
python3 -m synthigy.codegen check movies.xsql

import synthigy, movies_gen as ops
synthigy.connect(endpoint, client_id=..., client_secret=...)

rows  = ops.Movie.list({"since": 2000, "limit": 10})   # list[MovieListRow]
movie = ops.Movie.detail({"xid": xid})                 # MovieDetailRow | None
w     = ops.Dashboard.watch_stats(); w.ready()         # @watch variant
both  = ops.overview()                                 # @batch → ONE round trip
ops.sync_movie({"title": "Dune", "genres": [{"xid": "g-scifi"}]})

Codegen authenticates as the app — the same client credentials the app uses at runtime. /schema and describe are IAM-filtered per principal, so the generated contract is exactly what the app can do; a personal/dev identity would generate a surface the app can't honor. --no-writes skips the schema-derived <Entity>Input/sync_*/stack_*/delete_* tier. Empty or unknown op kinds in a saved IR are a hard error (a stale IR is never silently emitted from), and data keys stay snake_case verbatim — Python native is server native, no casing transform exists.

A committed end-to-end example lives in codegen-example/ (movies.xsql → movies.ir.json + schema.json → movies_gen.py).

Tests

python3 -m unittest discover -s tests            # hermetic (stub server)
SYNTHIGY_TEST_CLIENT_ID=... SYNTHIGY_TEST_CLIENT_SECRET=... \
  python3 -m unittest tests.test_integration -v  # live (default localhost:7887)

Register a dedicated OAuth client for the live suite (trusted confidential, client_credentials) — never share identity with a live app.

License

MIT — see LICENSE. The SDKs are permissive client libraries; the Synthigy engine is fair-code under the Sustainable Use License.