Meerkat Python SDK
Python SDK for the Meerkat runtime.
- Contract version: the same as the package version (
meerkat.CONTRACT_VERSION) - Python:
>=3.10 - Package:
meerkat-sdk
The SDK is session-first and runtime-backed: it spawns rkat-rpc and exposes typed Python handles (Session, DeferredSession, Mob) over the same canonical JSON-RPC surface used by CLI/REST/MCP.
Install
pip install meerkat-sdk
For local development:
pip install -e "sdks/python[dev]"
The rkat-rpc binary
MeerkatClient starts the first rkat-rpc it finds:
MEERKAT_BIN_PATH, when set.- An explicit
MeerkatClient(rkat_path=...)other than the default"rkat-rpc". rkat-rpconPATH.- The release binary of this SDK's own version, downloaded once from the
project's GitHub release and cached under
~/.cache/meerkat/bin/rkat-rpc/v<version>/<target>/.
The first three are binaries you chose, and the SDK runs them as they are:
trusting them is your decision. Only the download is verified. A published
meerkat-sdk package pins the sha256 of every release archive it may download
and of the rkat-rpc inside it: pinned when the package is built, from the
release's manifest, with each archive's build attestation verified, and never
fetched at download time. The
download uses HTTPS only, redirects included, and refuses an archive over
256 MiB (BINARY_DOWNLOAD_TOO_LARGE). The archive
is checked before anything is extracted, the binary before it is installed,
and the cached binary again each time it is reused (a few tenths of a second).
On a mismatch the SDK raises BinaryIntegrityError (code
BINARY_INTEGRITY_MISMATCH, with asset, path, expected_sha256 and
actual_sha256), deletes what failed, runs nothing and does not fall back to
another binary.
A source or git install of the SDK (for example pip install -e) pins no
digests, so instead of downloading it raises MeerkatError with code
BINARY_DIGEST_UNAVAILABLE. Install rkat-rpc yourself
(brew install lukacf/meerkat/rkat, or the release archive for your platform)
and put it on PATH, or set MEERKAT_BIN_PATH or rkat_path to a binary you
trust. In that case, and when the download fails, an rkat binary on PATH
is still used through its rpc subcommand.
Quick start
The selected model needs a compatible credential route: an already provisioned
auth binding or the provider's environment key. This example selects Claude.
For a clean API-key setup, export your Anthropic key in the shell that starts
Python; the rkat-rpc child inherits it:
export ANTHROPIC_API_KEY="<your-anthropic-api-key>"
Skip this export if you already use a compatible auth binding; pass it with
auth_binding when it is not the configured default. A different provider's
key is not a substitute for the selected model's credentials.
import asyncio
from meerkat import MeerkatClient
async def main() -> None:
async with MeerkatClient() as client:
session = await client.create_session(
"What is the capital of France?",
model="claude-sonnet-4-6",
)
print(session.text)
result = await session.turn("And Germany?")
print(result.text)
await session.archive()
asyncio.run(main())
Core API
Session creation
create_session, create_session_streaming, and create_deferred_session support:
- host context and identity:
injected_context,auth_binding, plustransient_turn_contextfor immediate create/stream only - model/provider controls:
model,provider,max_tokens,system_prompt,provider_params - structured output:
output_schema,structured_output_retries - runtime/tool toggles:
enable_builtins,enable_shell,enable_memory,enable_schedule,enable_workgraph,enable_mob,enable_web_search - comms/runtime metadata:
keep_alive,comms_name,peer_meta,budget_limits - skills:
preload_skills,skill_refs - session metadata:
labels - additional session config:
additional_instructions,app_context,shell_env,external_tools
Deferred creation stores injected context for its eventual first turn but does
not accept transient turn context. Pass transient facts to
DeferredSession.start_turn(...).
Session queries
await client.list_sessions(...) -> list[SessionSummary]await client.read_session(session_id) -> SessionDetailsawait client.read_session_history(session_id, offset=0, limit=None) -> SessionHistory
SessionSummary is returned by session/list and includes total_tokens.
SessionDetails is returned by session/read and includes model, provider, and last_assistant_text.
Both use integer unix timestamps for created_at and updated_at.
Session runtime inputs
await client.inject_context(session_id, text, source=..., idempotency_key=...)await session.inject_context(...)await client.send_external_event(session_id, event_type, payload, blocks=None)await session.send_external_event(event_type, payload, blocks=None)
Turns and streaming
Session.turn(...) and Session.stream(...) now expose full turn overrides:
injected_context,transient_turn_contextskill_refs,turn_tool_overlayadditional_instructionskeep_alive,model,provider,self_hosted_server_id,max_tokens,system_promptoutput_schema,structured_output_retries,provider_params
DeferredSession.start_turn(...) supports the same override set.
Config APIs return config write results
get_config returns a ConfigEnvelope:
{
"config": {...},
"generation": 12,
"realm_id": "...",
"instance_id": "...",
"backend": "...",
"resolved_paths": {...} | None,
}
set_config and patch_config return the same envelope fields plus optional
live_propagation when a write fans out to live channels.
Example:
config_envelope = await client.get_config()
updated = await client.patch_config(
{"max_tokens": 2048},
expected_generation=config_envelope["generation"],
)
Additional surfaces
Models catalog
await client.get_models_catalog() -> ModelsCatalogResponse
Schedules
await client.create_schedule(request)await client.get_schedule(schedule_id)await client.list_schedules(labels=None, limit=None, offset=None)await client.update_schedule(request)await client.pause_schedule(schedule_id)await client.resume_schedule(schedule_id)await client.delete_schedule(schedule_id)await client.list_schedule_occurrences(schedule_id, include_terminal=True|False)await client.list_schedule_tools()await client.call_schedule_tool({"name": "...", "arguments": {...}})
WorkGraph
WorkGraph is exposed as read-only observability from the SDK. Agents mutate work through their WorkGraph tools; SDK callers inspect the current graph.
await client.get_workgraph_item(item_id, realm_id=None, namespace=None)await client.list_workgraph_items(filter=None)await client.list_ready_workgraph_items(filter=None)await client.get_workgraph_snapshot(filter=None)await client.list_workgraph_events(filter=None)await client.get_workgraph_goal_status(GoalStatusRequest(...))await client.list_workgraph_attention(AttentionListRequest(...))
Jobs, approvals, artifacts, and projected event replay
- jobs:
jobs_get/list/cancel/progress/result/artifacts/retry/health/subscribe/unsubscribe - monitors and Meta workers:
monitors_start,meta_job_* - approvals:
request_approval,list_approvals,get_approval,decide_approval - artifacts:
list_artifacts,get_artifact,download_artifact - projected event recovery:
latest_event_cursor,list_events_since,event_snapshotwhen host event projection is enabled
Approval calls maintain audit records only; they do not automatically gate, authorize, or execute an action. They persist when the RPC bundle exposes a store path and otherwise remain process-local.
Explicitly ephemeral memory realms do not expose event cursor or snapshot replay APIs.
Every public Python RPC wrapper binds its request and result transport boundary
to generated RPC-schema contracts. Generated request/result classes for the
families above currently live in meerkat.generated.types; they are not
re-exported at the package root.
Auth profiles and credentials are realm-scoped. Provisioning yields an
auth_binding for a session or mob member spec, so the spec does not carry the
provider secret. Remote hosts resolve bindings only inside their authorized
realm.
Transcript editing and reconciliation
input_state,export_session_atif- transcript revision read/list, fork-at/fork-replace, rewrite, system-prompt update, and revision restore
Mob runtime
await client.read_mob_events(mob_id, after_cursor=0, limit=100)await mob.read_events(after_cursor=0, limit=100)await mob.spawn_many(specs) -> MobSpawnManyResultawait mob.wait_for_kickoff_complete(...)- helper methods use canonical
role_name - trusted multi-host controls cover host bind/revoke, route installs, scope grants, hard cancel, member history, and remote member live channels
Multi-host mutations are trusted host APIs. They are not agent-callable, and
the agent spawn wire cannot declare Rust's one-shot resume_from_role role
migration authority.
Live WebSocket and WebRTC
LiveChannel wraps the session-bound live lifecycle. live_open returns a
discriminated websocket or webrtc bootstrap. Only the WebSocket variant has
url; WebRTC callers create an SDP offer and call
live_webrtc_answer(channel_id, token, offer_sdp).
WebRTC requires connect(live_webrtc=True) and an rkat-rpc binary compiled
with its non-default live-webrtc Cargo feature. The 0.8.24 auto-downloaded
release binary omits that feature. Build a custom binary with
./scripts/repo-cargo build -p meerkat-rpc --features live-webrtc, and add an
audio track or the meerkat.live data channel before the browser creates its
offer. Set the local description, wait for ICE gathering to complete, and send
peer.localDescription.sdp; there is no candidate-trickle RPC. Install the
returned answer_sdp as the browser peer's remote description before live
input. WebSocket uses connect(live_ws=True) and does not need that Cargo
feature.
Realm profile CRUD
await client.create_mob_profile(name, profile)await client.get_mob_profile(name)returnsStoredMobProfile | Noneawait client.list_mob_profiles()await client.update_mob_profile(name, profile, expected_revision=...)await client.delete_mob_profile(name, expected_revision=...)
Streaming
session.stream(...) and client.create_session_streaming(...) return EventStream, an async context manager yielding typed event dataclasses (TextDelta, TurnCompleted, ToolExecutionCompleted, etc.).
from meerkat import TextDelta
async with session.stream("Explain this in detail.") as events:
async for event in events:
match event:
case TextDelta(delta=chunk):
print(chunk, end="", flush=True)
result = events.result
TurnCompleted.usage is optional; absent means unmeasured, not zero.
RunStarted.input preserves the typed RunInput: content (text or blocks) or
a pending_tool_results continuation without a fabricated prompt.
RunFailed accepts the current error_report and derives its display fields
from that report.
Inventory-known events without a handwritten parser class arrive as
UnknownEvent, preserving event.type and the complete wire payload in
event.data. This includes server_tool_content, all four model_fallback_*
events, transcript_rewrite_audit_receipt_committed, boundary_append_applied,
and boundary_appends_discarded. A present type outside the generated inventory
raises MeerkatError with code UNKNOWN_EVENT_TYPE.
A missing type or malformed payload for a handwritten parser class arrives as
UnknownEvent(type="malformed_event"), with the original payload in
event.data. The Retrying and HookFailed parsers still expect legacy flat
fields; current payloads carry retry and reason, respectively, so they take
this malformed path. See the event compatibility
reference for details.
Run tests
pip install -e "sdks/python[dev]"
pytest sdks/python/tests/test_types.py -v
pytest sdks/python/tests/test_audit_parity.py -v
pytest sdks/python/tests/test_e2e.py -v
pytest sdks/python/tests/test_e2e_smoke.py -v
1 maintainer
Metadata
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