gtm-linear

Async-first Python SDK for the Linear GraphQL API. Thin, typed wrapper around httpx with optional sync support, Strawberry-typed models, and explicit error semantics.

Status: Pre-alpha (0.0.1). PyPI name reserved. API surface is small and stable but incomplete — fall back to raw LinearClient.execute_async for anything not yet wrapped.

When to use this (agent triage)

If you only need to create or read a few issues from an automation, this is the right tool. If you need broad schema coverage, drop down to execute_async with a hand-written query.

Install

uv pip install gtm-linear        # once published
# or, in this repo:
uv sync

Requires Python >=3.11. Runtime deps: httpx>=0.27, pydantic>=2.0, strawberry-graphql>=0.240.

Auth

Linear personal API key. Format: lin_api_.... Pass the raw key as the Authorization header value (no Bearer prefix — Linear accepts the key directly).

export LINEAR_API_KEY=lin_api_xxx

The SDK does not read env vars on its own. Caller is responsible for passing api_key= to LinearClient.

Mental model

Three classes, all importable from the package root:

LinearClient        # transport + auth + GraphQL execution
  ├── LinearQueries # typed read wrappers (get_issue, list_issues, search_issues, get_team, get_user)
  └── LinearMutations # typed write wrappers (issues and comments)

LinearQueries and LinearMutations are stateless facades over a LinearClient. They do not own the client; they borrow it. Construct one client and pass it to both.

Pydantic models validate Linear response payloads and mutation inputs internally. Strawberry's Pydantic integration exposes those validated models as the public GraphQL types and inputs.

import asyncio
from gtm_linear import (
    IssueCreateInput,
    LinearClient,
    LinearMutations,
    LinearQueries,
    PaginationOrderBy,
)

async def main() -> None:
    async with LinearClient(api_key="lin_api_xxx") as client:
        queries = LinearQueries(client)
        mutations = LinearMutations(client)

        team = await queries.get_team_by_key("ENG")
        assert team is not None
        issue_filter = {"team": {"id": {"eq": team.id}}}
        issues = await queries.list_issues_page(
            issue_filter,
            first=20,
            order_by=PaginationOrderBy.updatedAt,
        )
        created = await mutations.create_issue(
            IssueCreateInput(title="Hello", teamId=team.id, description="from agent"),
        )

asyncio.run(main())

Public API surface

Importable from gtm_linear:

The public Strawberry types are backed by Pydantic models, so malformed API payloads and invalid mutation inputs fail validation before they are exposed to callers or sent to Linear.

IssueCreateInput and IssueUpdateInput are Strawberry input types backed by Pydantic models. Construct positionally or with kwargs; some static type checkers may flag the call signature — the scripts/smoke.py file demonstrates the working ignore pattern. Optional fields set to None are omitted from mutation variables.

LinearClient reference

LinearClient(api_key: str)

State:

• BASE_URL = "https://api.linear.app/graphql" (class attribute, overrideable on subclasses or by monkeypatch in tests)
• Lazily creates an httpx.Client (sync) and httpx.AsyncClient (async) on first use.
• Connection reuse: both clients persist across calls until their respective close method or context-manager exit.

Methods

Error contract

execute / execute_async raise LinearAPIError if either:

1. The response JSON contains a top-level errors key (GraphQL-level failure), OR
2. The HTTP status is not 200, OR
3. The response is not parseable JSON / not a dict.

LinearAPIError.errors is the raw list of error dicts from Linear; LinearAPIError.message is a human-readable summary. Inspect .errors to recover structured codes.

Return value

The methods strip the outer {"data": ...} envelope and return the inner dict. So for a query of query { viewer { id } }, you get back {"viewer": {"id": "..."}}.

Client pitfalls

• Use close() for sync-only use and await aclose() for async-only use. close() raises RuntimeError if an async client remains open, so it cannot silently leak the async connection pool. async with closes both transports if they were created.
• BASE_URL is the production Linear endpoint. There is no staging URL toggle.
• The Authorization header is set to the raw API key string. Linear expects no Bearer prefix; do not add one.

LinearQueries reference

All methods are async. All accept Linear UUIDs unless noted.

Team key → ID and filtered issue pages

Use get_team_by_key to resolve a human-facing team key, then query a cursor-aware connection. The following finds open issues in that team, ordered by their latest update:

from gtm_linear import (
    PaginationOrderBy,
)

team = await queries.get_team_by_key("ENG")
assert team is not None
issue_filter = {
    "team": {"id": {"eq": team.id}},
    "state": {"type": {"nin": ["completed", "canceled"]}},
}
page_size = 100
order_by = PaginationOrderBy.updatedAt
issues = await queries.list_issues_page(
    issue_filter,
    first=page_size,
    order_by=order_by,
)
for issue in issues.nodes:
    print(issue.identifier)

if issues.page_info.has_next_page:
    next_page = await queries.list_issues_page(
        issue_filter,
        first=page_size,
        after=issues.page_info.end_cursor,
        order_by=order_by,
    )

Issue shape returned by queries

Every issue method returns this projection:

Issue(
    id: str,
    title: str,
    description: str | None,
    identifier: str,       # e.g. "ENG-123" — the human-readable ID
    url: str,
    priority: int | None,  # 0=None, 1=Urgent, 2=High, 3=Medium, 4=Low (Linear convention)
    status: str | None,    # state.name flattened — e.g. "In Progress"
    assignee: User | None,
)

status is a flattened string (the state's name), not the full Linear WorkflowState object. If you need state ID or color, use execute_async directly.

LinearMutations reference

Mutation pitfalls

• IssueCreateInput and IssueUpdateInput omit fields set to None; values such as priority=0 and labelIds=[] are forwarded to Linear.
• delete_issue returns Linear's success bool. A False return is not an exception — check it explicitly if you care.
• create_issue and update_issue raise ValueError, not LinearAPIError, when the API responds 200 but with an empty issue. Catch both if you're wrapping.
• create_comment returns a typed Comment with createdAt parsed as a timezone-aware datetime when Linear returns an ISO-8601 timestamp.

Sync vs async

The transport supports both. The typed wrappers (LinearQueries, LinearMutations) are async-only today. To use them from sync code, wrap with asyncio.run:

import asyncio
from gtm_linear import LinearClient, LinearQueries

async def fetch() -> None:
    async with LinearClient(api_key="...") as client:
        return await LinearQueries(client).get_issue("iss-1")

issue = asyncio.run(fetch())

For sync-only use, drop down to LinearClient.execute(...) directly.

Error handling pattern

from gtm_linear import LinearAPIError, LinearClient

try:
    async with LinearClient(api_key=key) as client:
        data = await client.execute_async("query { viewer { id } }")
except LinearAPIError as exc:
    # Both transport and GraphQL errors land here.
    print(exc.message)
    for err in exc.errors:
        print(err.get("extensions", {}).get("code"), err.get("message"))

Common Linear error codes worth branching on (found in errors[].extensions.code):

• AUTHENTICATION_ERROR — bad / missing API key
• FORBIDDEN — key lacks scope for the operation
• INVALID_INPUT — malformed mutation input
• RATELIMITED — back off and retry

The SDK does not retry on rate limits. Implement back-off at the call site.

Live smoke test

Read-only by default. Use to verify auth, network, and basic schema access:

LINEAR_API_KEY=lin_api_xxx uv run python scripts/smoke.py --team-key ENG
# add --create to also create+delete a throwaway issue

The script exercises: viewer query, get_team_by_key, get_team, list_issues_page, search_issues, and optionally create_issue + delete_issue. Source: scripts/smoke.py.

Repository layout

sdk-python-linear/
├── src/
│   ├── __init__.py           # public re-exports
│   ├── client.py             # LinearClient (httpx transport)
│   ├── exceptions.py         # LinearAPIError
│   ├── generated_types.py    # Strawberry-decorated models + input types
│   ├── queries.py            # LinearQueries (async read helpers)
│   └── mutations.py          # LinearMutations (async write helpers)
├── tests/
│   ├── test_client.py        # respx-mocked transport tests (sync + async)
│   ├── test_queries.py       # respx-mocked query parsing tests
│   └── test_mutations.py     # respx-mocked mutation tests
├── scripts/
│   └── smoke.py              # live API smoke test
├── pyproject.toml            # uv + hatchling; deps + dev deps + pytest config
├── pyrefly.toml              # type-checker config
└── .trunk/                   # lint config (trunk.io)

Build backend: hatchling. Wheel packages: ["gtm_linear"].

Development

uv sync                       # install deps
uv run pytest                 # run tests (respx-mocked, no network)
uv run pytest tests/test_client.py::test_execute_sync_returns_data  # single test
trunk check --all             # lint + type check
trunk fmt                     # autoformat

Tests use respx to mock httpx — no network access required. pytest-asyncio is in auto mode, so async test functions don't need decoration.

Conventions

• All public methods are documented with Google-style docstrings.
• Strawberry types in generated_types.py use # type: ignore[misc] on the decorator due to a known mypy ↔ Strawberry interaction.
• Input types are constructed positionally in tests and the smoke script; some checkers flag this (see # pyright: ignore[reportCallIssue] in scripts/smoke.py).
• No retries, no connection pooling tuning, no logging. Add at the call site.

Known gaps (read before extending)

1. Filtering coverage: Issue filters are plain dict[str, Any] mappings that mirror Linear's nested filter tree. Use execute_async for other Linear filters.
2. Schema coverage: Only Issue, Comment, Team, User, and Project are typed. Attachments, cycles, projects-as-containers, workflows, and webhooks remain absent.
3. Search filtering: search_issues accepts only a text term. Use list_issues_page for mapped team/state filtering.
4. Subscriptions: Not supported. Linear's subscription API requires WebSockets — the client is HTTP-only.
5. Status enum: status is flattened to state.name. To filter by state ID, query state { id } via execute_async.

License

MIT. See LICENSE.