diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..42c9e24
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: "24"
+          cache: npm
+      - run: npm ci
+      - run: npm run typecheck
+      - run: npm run build
+      - run: npm run test
diff --git a/src/index.ts b/src/index.ts
index d933748..bce346b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,15 +7,6 @@ const API_BASE =
   process.env["MCP_BUGZILLA_BASE_URL"] ?? "https://bugzilla.mozilla.org/rest"
 const API_KEY = process.env["MCP_BUGZILLA_API_KEY"]
 
-export class BugzillaError extends Error {
-  constructor(
-    public status: number,
-    public body: string,
-  ) {
-    super(`Bugzilla API error ${status}: ${body}`)
-  }
-}
-
 export const apiFetch = async <T>(
   path: string,
   options: RequestInit = {},
@@ -26,12 +17,18 @@ export const apiFetch = async <T>(
   }
   if (API_KEY) headers["X-BUGZILLA-API-KEY"] = API_KEY
 
-  const response = await fetch(`${API_BASE}${path}`, { ...options, headers })
-  if (!response.ok) {
-    const body = await response.text()
-    throw new BugzillaError(response.status, body)
+  try {
+    const response = await fetch(`${API_BASE}${path}`, { ...options, headers })
+    if (!response.ok) {
+      const body = await response.text()
+      console.error(`Bugzilla API error ${response.status}: ${body} — ${path}`)
+      return null
+    }
+    return (await response.json()) as T
+  } catch (error) {
+    console.error(`Fetch failed: ${path}`, error)
+    return null
   }
-  return (await response.json()) as T
 }
 
 export const ok = (data: unknown) => ({
@@ -90,15 +87,11 @@ export const createBug = async (params: {
   target_milestone?: string
 }) => {
   if (!API_KEY) return err("MCP_BUGZILLA_API_KEY is required to create bugs")
-  try {
-    const data = await apiFetch<{ id: number }>("/bug", {
-      method: "POST",
-      body: JSON.stringify(params),
-    })
-    return data?.id ? ok({ id: data.id }) : err("failed to create bug")
-  } catch (e) {
-    return err(e instanceof Error ? e.message : "failed to create bug")
-  }
+  const data = await apiFetch<{ id: number }>("/bug", {
+    method: "POST",
+    body: JSON.stringify(params),
+  })
+  return data?.id ? ok({ id: data.id }) : err("failed to create bug")
 }
 
 export const updateBug = async (params: {
@@ -117,15 +110,11 @@ export const updateBug = async (params: {
 }) => {
   if (!API_KEY) return err("MCP_BUGZILLA_API_KEY is required to update bugs")
   const { id, ...fields } = params
-  try {
-    const data = await apiFetch<{ bugs: unknown[] }>(`/bug/${id}`, {
-      method: "PUT",
-      body: JSON.stringify(fields),
-    })
-    return data?.bugs ? ok(data.bugs) : err(`failed to update bug ${id}`)
-  } catch (e) {
-    return err(e instanceof Error ? e.message : `failed to update bug ${id}`)
-  }
+  const data = await apiFetch<{ bugs: unknown[] }>(`/bug/${id}`, {
+    method: "PUT",
+    body: JSON.stringify(fields),
+  })
+  return data?.bugs ? ok(data.bugs) : err(`failed to update bug ${id}`)
 }
 
 export const getBugHistory = async ({ id }: { id: string }) => {
@@ -159,15 +148,11 @@ export const createComment = async (params: {
 }) => {
   if (!API_KEY) return err("MCP_BUGZILLA_API_KEY is required to post comments")
   const { id, ...body } = params
-  try {
-    const data = await apiFetch<{ id: number }>(`/bug/${id}/comment`, {
-      method: "POST",
-      body: JSON.stringify(body),
-    })
-    return data?.id ? ok({ id: data.id }) : err("failed to create comment")
-  } catch (e) {
-    return err(e instanceof Error ? e.message : "failed to create comment")
-  }
+  const data = await apiFetch<{ id: number }>(`/bug/${id}/comment`, {
+    method: "POST",
+    body: JSON.stringify(body),
+  })
+  return data?.id ? ok({ id: data.id }) : err("failed to create comment")
 }
 
 export const searchCommentTags = async ({
@@ -224,17 +209,13 @@ export const createAttachment = async (params: {
   if (!API_KEY)
     return err("MCP_BUGZILLA_API_KEY is required to create attachments")
   const { id, ...body } = params
-  try {
-    const result = await apiFetch<{ ids: number[] }>(`/bug/${id}/attachment`, {
-      method: "POST",
-      body: JSON.stringify({ ...body, ids: [id] }),
-    })
-    return result?.ids
-      ? ok({ ids: result.ids })
-      : err("failed to create attachment")
-  } catch (e) {
-    return err(e instanceof Error ? e.message : "failed to create attachment")
-  }
+  const result = await apiFetch<{ ids: number[] }>(`/bug/${id}/attachment`, {
+    method: "POST",
+    body: JSON.stringify({ ...body, ids: [id] }),
+  })
+  return result?.ids
+    ? ok({ ids: result.ids })
+    : err("failed to create attachment")
 }
 
 export const updateAttachment = async (params: {