Submission blocked by hook - ERROR_HOOKS_BLOCKED (Session initialization failed: 400)

[Chaewon_Lee]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Request ID: 4aed1ab5-07ef-4f1c-a775-533da1f34c87
{“error”:“ERROR_HOOKS_BLOCKED”,“details”:{“title”:“Submission blocked by hook”,“detail”:“Hook blocked with message: Hook error: Error: Session initialization failed: 400”,“additionalInfo”:{},“buttons”:,“planChoices”:}}
Hook blocked with message: Hook error: Error: Session initialization failed: 400

Steps to Reproduce

Open a new chat in Cursor IDE.

Ask the agent to run with my repository context enabled.

Wait for the response.

The request fails with ERROR_HOOKS_BLOCKED and Session initialization failed: 400.

Expected Behavior

The agent request should be processed successfully without the hook being blocked, and I should receive a normal response instead of this error.

Screenshots / Screen Recordings

Operating System

MacOS

Version Information

Version: 2.4.27
VSCode Version: 1.105.1
Commit: 4f2b772756b8f609e1354b3063de282ccbe7a690
Date: 2026-01-31T21:24:58.143Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

Does this stop you from using Cursor

Yes - Cursor is unusable

[deanrie]

Hey, this is a known issue - Cursor is trying to execute hooks from the Claude Code configs (~/.claude/), and if there are plugins with a sessionStart hook, it results in this error.

The quickest solution is to disable the import in Cursor Settings > Rules, Skills, Subagents - there’s an option “Import skills from Claude Code,” turn it off.

Alternatively, you can check/delete:

• ~/.claude/settings.json
• ~/.claude/plugins/

After that, restart Cursor.

Let me know if it doesn’t help.

[vitaligusatinsky]

Have same issue, no hooks.json in project or user root in .cursor folder. Started suddenly, now can’t work so having to use Codex and Claude Code.

[Opti-kjh (김종호)]

안녕하세요. 한국분이시군요 ㅎㅎㅎ
저도 동일한 증상이 발현됐었어요.
해결한 방법을 공유드릴께요.

원인은 ~/.claude/settings.json에 enabledPlugins이 전역으로 선언되어있으면 위와 같이 Hook Error가 발생합니다.
이때 ~/.claude/settings.json의 enabledPlugins는 모두 제거하고 각각의 프로젝트 루트의 .claude/settings.local.json 또는 settings.json으로 enabledPlugins를 옮겨야 Hook Error가 해결됩니다.

Err:

Sharing the solution

The cause is that if enabledPlugins is declared globally in ~/.claude/settings.json, the Hook Error occurs as described above. To resolve this Hook Error, remove all entries from enabledPlugins in ~/.claude/settings.json and move them to either .claude/settings.local.json or settings.json within each project’s root directory.