linear-bug-workflow-runner

Overview

Linear's API is GraphQL-only. Unlike Jira's REST workflow engine, Linear's lifecycle is driven by WorkflowState objects: each team has its own states (Backlog / Todo / In Progress / In Review / Done / Cancelled, plus team-specific additions). To transition a defect, set its stateId to the target state's ID.

This skill wraps Linear's GraphQL API (linear.app/developers/graphql) for create / update / transition / search.

When to use

• Filing a bug from a CI test failure (consumed by bug-report-from-failure).
• Transitioning bugs in bulk after a release.
• Backing duplicate-defect search for Linear-using teams.

How to use

1. Authenticate: personal API key (no Bearer) or OAuth token (with Bearer) - the header format differs (see Authentication).
2. Look up the target team's workflowStates and resolve states by type, not display name (see Discover state IDs).
3. Dedupe with the issues filter query, then issueCreate in an unstarted state; issueUpdate to transition as the fix progresses (see Search / Create / Transition).
4. Resolve-by-type helpers, CI wiring, and result parsing are in references/linear-graphql-reference.md.

Authentication

Per Linear API docs, two auth modes:

# Personal API key (lin_api_*)
export LINEAR_KEY="lin_api_xxxxxxxxxxxxxxxxxx"

# Or OAuth bearer token
export LINEAR_TOKEN="<oauth-access-token>"

HEADERS_KEY = {
    "Authorization": os.environ["LINEAR_KEY"],   # personal key, no Bearer
    "Content-Type": "application/json",
}
HEADERS_OAUTH = {
    "Authorization": f"Bearer {os.environ['LINEAR_TOKEN']}",
    "Content-Type": "application/json",
}
ENDPOINT = "https://api.linear.app/graphql"

Note: personal API keys use the Authorization header without the Bearer prefix; OAuth tokens use Bearer. This is unusual - many GraphQL APIs reject the bareword auth - confirmed in Linear's quickstart.

Create a bug

The issueCreate mutation per linear.app/developers/graphql:

import requests, os

QUERY = """
mutation IssueCreate($input: IssueCreateInput!) {
  issueCreate(input: $input) {
    success
    issue { id identifier url state { name } }
  }
}
"""

def create_bug(team_id, title, description_md, priority, state_id, label_ids=None):
    variables = {
        "input": {
            "teamId": team_id,
            "title": title,
            "description": description_md,  # Markdown supported
            "priority": priority,            # 0=No, 1=Urgent, 2=High, 3=Med, 4=Low
            "stateId": state_id,             # initial state (e.g., "Backlog" or "Todo")
            "labelIds": label_ids or [],
        }
    }
    r = requests.post(ENDPOINT, json={"query": QUERY, "variables": variables},
                      headers=HEADERS_KEY)
    r.raise_for_status()
    data = r.json()
    if data.get("errors"):
        raise RuntimeError(data["errors"])
    return data["data"]["issueCreate"]["issue"]

Priority integer values

Per Linear's published priority enum (visible across the GraphQL schema and the dashboard tooltip):

Reverse of what some might expect: 1 is highest urgency.

Discover state IDs per team

State IDs are per-team. Look them up via workflowStates query:

STATES_QUERY = """
query Workflow($teamId: String!) {
  workflowStates(filter: { team: { id: { eq: $teamId } } }) {
    nodes { id name type }
  }
}
"""

def get_states(team_id):
    r = requests.post(ENDPOINT,
        json={"query": STATES_QUERY, "variables": {"teamId": team_id}},
        headers=HEADERS_KEY)
    r.raise_for_status()
    return r.json()["data"]["workflowStates"]["nodes"]

type is one of backlog, unstarted, started, completed, canceled - the canonical lifecycle bucket independent of the state's display name. Resolve by type, never by team-customisable name. (The unfiltered all-teams form of this query is in references/linear-graphql-reference.md.)

Transition (update state)

issueUpdate mutation:

UPDATE_QUERY = """
mutation IssueUpdate($id: String!, $input: IssueUpdateInput!) {
  issueUpdate(id: $id, input: $input) {
    success
    issue { id state { name } }
  }
}
"""

def transition(issue_id, new_state_id):
    variables = {"id": issue_id, "input": {"stateId": new_state_id}}
    r = requests.post(ENDPOINT, json={"query": UPDATE_QUERY, "variables": variables},
                      headers=HEADERS_KEY)
    r.raise_for_status()
    data = r.json()
    return data["data"]["issueUpdate"]["success"]

issueUpdate accepts the same input fields as issueCreate (except teamId which is immutable) plus assignee, due date, estimate, etc.

Search

The issues query supports filter expressions:

SEARCH_QUERY = """
query SearchIssues($filter: IssueFilter!) {
  issues(filter: $filter, first: 50) {
    nodes { id identifier title state { name } priority }
  }
}
"""

def find_dupes(team_id, title_text):
    r = requests.post(ENDPOINT,
        json={"query": SEARCH_QUERY, "variables": {"filter": {
            "team": {"id": {"eq": team_id}},
            "title": {"contains": title_text},
            "state": {"type": {"neq": "completed"}},
        }}},
        headers=HEADERS_KEY)
    r.raise_for_status()
    return r.json()["data"]["issues"]["nodes"]

Filter operators: eq, neq, contains, startsWith, endsWith, plus comparison for numerics.

Worked example

File a bug from a CI failure idempotently: dedupe by title, comment on the existing issue if found, otherwise create it in the team's unstarted state. This reuses find_dupes, get_states, and create_bug above:

def create_or_attach(team_id, title, description):
    dupes = find_dupes(team_id, title)
    if dupes:
        # Comment on the existing issue rather than duplicate
        add_comment(dupes[0]["id"], f"Recurred: {description[:500]}")
        return dupes[0]["identifier"]
    todo_state = next(s for s in get_states(team_id) if s["type"] == "unstarted")
    return create_bug(team_id, title, description, priority=3,
                      state_id=todo_state["id"])["identifier"]

# From a failing pytest run:
ident = create_or_attach(
    team_id, "Payment webhook retries drop events",
    "Repro: send 3 webhooks in 1s; 2 are lost.",
)
print(f"Bug tracked as {ident}")   # e.g. ENG-1234

add_comment uses the commentCreate mutation (similar shape; omitted for brevity). issueCreate.issue.identifier is the human-readable ID (e.g., ENG-1234); issueCreate.issue.url is the canonical permalink. To resolve the bug to Done after the fix ships without hard-coding state names, use the transition_to_completed helper in references/linear-graphql-reference.md.

Anti-patterns

Limitations

• GraphQL learning curve. Engineers used to REST may write noisy queries that over-fetch.
• State type enum is small. Five values cover the lifecycle; fine-grained sub-states (e.g., "Code Review" vs "In Progress") share type: started. Use name + type together when needed.
• Webhook complement. For event-driven workflows (notification on state change), pair with Linear webhooks rather than polling.
• Personal API key bypasses 2FA - use OAuth bearer for user-impersonating flows.
• Rate limits. ~1500 requests / 15 min per token; bulk operations need throttling.

References

• Linear GraphQL API quickstart - linear.app/developers/graphql.
• Linear API overview - linear.app/developers.
• Linear GraphQL schema (Apollo Studio) - referenced from the developer docs.
• Deep reference (resolve-by-type helper, all-teams query, CI wiring, result parsing): references/linear-graphql-reference.md.
• Sibling references: bug-lifecycle-reference, severity-vs-priority-reference.
• Sibling skills: jira-bug-workflow-runner, github-issues-bug-workflow.
• Consumed by: bug-report-from-failure.