UserPromptSubmit Hook - Claude Code
Fires before Claude processes user input; can validate or block.
UserPromptSubmit runs right after you hit Enter and before Claude sees the prompt. Use it to validate, transform, or block what goes to the model.
What it does
The hook receives the submitted prompt. It can allow it through unchanged, modify it (append project context, redact secrets), or reject it with a reason. This is the cleanest way to enforce team prompt policies, strip sensitive data, or inject reminders into every turn.
When to use it
- Auto-appending "run tests after your changes" to every prompt.
- Redacting secrets like tokens or passwords before they hit the model.
- Blocking prompts that match a forbidden pattern (e.g., "delete production").
- Injecting per-prompt context like the current branch or PR number.
Gotchas
- Heavy transformations confuse users when the model responds to something they didn't type. Keep transforms visible.
- Synchronous hooks add latency to every turn. Stay fast.
- Rejection messages should be clear - "denied by policy: reason" beats a silent block.
Official docs: https://code.claude.com/docs/en/hooks.md#userpromptsubmit
Continue Reading
- Claude Code - plans, install routes, and alternatives on one page
- Claude Code Power User course - wiring deterministic hooks like this one, plus skills and subagents
Technical content at the intersection of AI and development. Building with AI agents, Claude Code, and modern dev tools - then showing you exactly how it works.
Was this helpful?
Related Guides
Related Tools
Claude Agent SDK
Anthropic's SDK for building agents on the same tools, agent loop, and context management that power Claude Code. Python...
View Tool
Claude Code
Anthropic's agentic coding CLI. Runs in your terminal, edits files autonomously, spawns sub-agents, and maintains memory...
View ToolCodeburn
Interactive TUI dashboard that shows exactly where your Claude Code and Cursor tokens are going, in real time.
View ToolConductor
Mac app for running parallel Claude Code, Codex, and Cursor agents in isolated workspaces. Watch every agent work at onc...
View ToolRelated Videos
Generate Videos in Codex + Claude Code with This...
Check out HeyGen! https://heygen.1stcollab.com/developersdigest The video introduces HeyGen, an AI video generation platform with a rich API and a CLI that lets developers create, fetch, and manipula...
10x Design in Claude Code and Codex
Try Higgsfield: https://higgsfield.ai/s/higgsfield-general-campaign-developersdigest-juDMTi AI coding agents can build entire websites in minutes, but the default results often still look generic and...
Self Improving Applications with Claude Code & Codex
Build a Self‑Improving Next.js App: Supabase + Vercel Eve + GitHub Issues + Agent Loops Check out Supabase: https://supabase.plug.dev/1wWOTGS The video demonstrates how to build and deploy a self-im...
Related Posts
Claude Fable 5.1 in Claude Code: How to Switch, Pin, and Pay Less
Claude Code v2.1.257 points /model fable at Fable 5.1: 1M context, $10/$50 per MTok, $0.25 cache reads. Setup, gotchas,...
Claude Design, Slides and Docs in Any Chat: How to Use Them
Claude Design, Slides and Docs now open in any Claude chat, Claude Code session or the Artifacts tab, on every plan. Exa...
Claude for Startups Offer Paused: What Founders Do Now
Claude for Startups paused its free Claude Team year and $1,000 API credit offer at capacity. What the program page says...
Claude Advisor Tool vs a Bigger Model: When the Pairing Pays
Anthropic's own runs: a Fable 5.1 advisor added 1.7 points to Opus 5.5 for 2.1x the cost. When the Claude advisor tool p...
Claude Code Retry Watchdog: Keep Unattended Runs Alive
CLAUDE_CODE_RETRY_WATCHDOG=1 makes Claude Code wait out 429 and 529 errors instead of failing after 10 retries. When to...
Claude Max API Credits: $100 a Month, What They Cover
Claude Max and Team plans now include a monthly Claude API credit, starting at $100 on Max 5x. What it covers, what it d...
