linear-common-errors

Diagnose and fix common Linear API and SDK errors. Use when encountering Linear API errors, debugging integration issues, or troubleshooting authentication, rate limits, or query problems. Trigger: "linear error", "linear API error", "debug linear", "linear not working", "linear 429", "linear authentication error".

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name	linear-common-errors
description	Diagnose and fix common Linear API and SDK errors. Use when encountering Linear API errors, debugging integration issues, or troubleshooting authentication, rate limits, or query problems. Trigger: "linear error", "linear API error", "debug linear", "linear not working", "linear 429", "linear authentication error".
allowed-tools	Read, Write, Edit, Grep, Bash(curl:*)
version	1.12.0
license	MIT
author	Jeremy Longshore <jeremy@intentsolutions.io>
tags	["saas","linear","api","debugging","authentication"]
compatibility	Designed for Claude Code

Linear Common Errors

Overview

Quick reference for diagnosing and resolving common Linear API and SDK errors. Linear's GraphQL API returns errors in response.errors[] with extensions.type and extensions.userPresentableMessage fields. HTTP 200 responses can still contain partial errors -- always check the errors array.

Prerequisites

Linear SDK or raw API access configured
Access to application logs
Understanding of GraphQL error response format

Instructions

Error Response Structure

// Linear GraphQL error shape
interface LinearGraphQLResponse {
  data: Record<string, any> | null;
  errors?: Array<{
    message: string;
    path?: string[];
    extensions: {
      type: string;  // "authentication_error", "forbidden", "ratelimited", etc.
      userPresentableMessage?: string;
    };
  }>;
}

// SDK throws these typed errors
import { LinearError, InvalidInputLinearError } from "@linear/sdk";
// LinearError includes: .status, .message, .type, .query, .variables
// InvalidInputLinearError extends LinearError for mutation input errors

Error 1: Authentication Failures

// extensions.type: "authentication_error"
// HTTP 401 or error in response.errors

// Diagnostic check
async  (): <> {
   {
     client =  ({ : process..! });
     viewer =  client.;
    .();
  }  (: ) {
     (error.?.()) {
      .();
      .();
    }
     error;
  }
}

curl -s -X POST https://api.linear.app/graphql \
  -H "Authorization: $LINEAR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"query": "{ viewer { id name email } }"}' | jq .

// extensions.type: "ratelimited"
// HTTP 429 with rate limit headers

async function withRetry<T>(fn: () => Promise<T>, maxRetries = 5): Promise<T> {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    try {
      return await fn();
    } catch (error: any) {
      const isRateLimited = error.status === 429 ||
        error.message?.includes("rate") ||
        error.type === "ratelimited";
      if (!isRateLimited || attempt === maxRetries - 1) throw error;

      const delay = 1000 * Math.pow(2, attempt) + Math.random() * 500;
      console.warn(`Rate limited (attempt ${attempt + 1}), waiting ${Math.round(delay)}ms`);
      await new Promise(r => setTimeout(r, delay));
    }
  }
  throw new Error("Unreachable");
}

const resp = await fetch("https://api.linear.app/graphql", {
  method: "POST",
  headers: {
    Authorization: process.env.LINEAR_API_KEY!,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ query: "{ viewer { id } }" }),
});

console.log("Requests remaining:", resp.headers.get("x-ratelimit-requests-remaining"));
console.log("Requests limit:", resp.headers.get("x-ratelimit-requests-limit"));
console.log("Requests reset:", resp.headers.get("x-ratelimit-requests-reset"));
console.log("Complexity:", resp.headers.get("x-complexity"));

// BAD: ~12,500 complexity (250 * 50 labels)
const heavy = await client.issues({ first: 250 });

// GOOD: reduce page size and fetch relations separately
const light = await client.issues({ first: 50 });

// extensions.type: "not_found"
// Cause: deleted, archived, wrong workspace, or insufficient permissions

try {
  const issue = await client.issue("nonexistent-uuid");
} catch (error: any) {
  if (error.message?.includes("Entity not found")) {
    console.error("Issue may be deleted, archived, or in another workspace.");
    console.error("Try: client.issues({ includeArchived: true })");
  }
}

import { InvalidInputLinearError } from "@linear/sdk";

try {
  await client.createIssue({
    teamId: "invalid-uuid",
    title: "", // Empty title
  });
} catch (error) {
  if (error instanceof InvalidInputLinearError) {
    console.error("Invalid input:", error.message);
    // error.query and error.variables contain request details
  }
}

// SDK models lazy-load relations -- they can be null
const issue = await client.issue("uuid");

// BAD: crashes if unassigned
// const name = (await issue.assignee).name;

// GOOD: optional chaining
const name = (await issue.assignee)?.name ?? "Unassigned";
const projectName = (await issue.project)?.name ?? "No project";

// Happens when LINEAR_WEBHOOK_SECRET doesn't match the webhook config
import crypto from "crypto";

function verifyWebhook(payload: string, signature: string, secret: string): boolean {
  const expected = crypto.createHmac("sha256", secret).update(payload).digest("hex");
  try {
    return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));
  } catch {
    return false; // Length mismatch
  }
}

Error	extensions.type	HTTP	Cause	Fix
Authentication required	`authentication_error`	401	Invalid/expired key	Regenerate at Settings > API
Forbidden	`forbidden`	403	Missing OAuth scope	Re-authorize with correct scopes
Rate limited	`ratelimited`	429	Budget exceeded	Exponential backoff, reduce complexity
Query complexity too high	`query_error`	400	Deep nesting or large pages	Reduce `first`, flatten query
Entity not found	`not_found`	200	Deleted/archived/wrong workspace	Verify ID, try `includeArchived`
Validation error	`invalid_input`	200	Bad mutation input	Check field constraints
Webhook sig mismatch	N/A (local)	N/A	Wrong signing secret	Match `LINEAR_WEBHOOK_SECRET`

import { LinearError, InvalidInputLinearError } from "@linear/sdk";

async function handleLinearOp<T>(fn: () => Promise<T>): Promise<T> {
  try {
    return await fn();
  } catch (error) {
    if (error instanceof InvalidInputLinearError) {
      console.error(`Input error: ${error.message}`);
    } else if (error instanceof LinearError) {
      console.error(`Linear error [${error.status}]: ${error.message}`);
      if (error.status === 429) {
        console.error("Rate limited — implement backoff");
      }
    } else {
      console.error("Unexpected error:", error);
    }
    throw error;
  }
}