Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add tercel/prompt-coach/plugin install prompt-coachWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/hooks/tercel/prompt-coach/user-prompt-submit)<a href="https://agentmods.dev/hooks/tercel/prompt-coach/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/tercel/prompt-coach/user-prompt-submit.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
UserPromptSubmit scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 14 lines scan A 1b2a40c8560a
UserPromptSubmit is a hook published in the GitHub repository tercel/prompt-coach (2 stars, last pushed 3d ago), with no licence file. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other hooks, from other repositories
PostToolUse
Runs after a tool call finishes for Bash and Skill tool calls, running claude-memes hook bash (2 commands). From ShovalBenjer/claude-memes-skills.
Stop
Runs when the agent finishes a response, running claude-memes hook stop. From ShovalBenjer/claude-memes-skills.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing chat-memory.py, bm25-memory.py and memory-keyword-trigger.py with --rich (3 commands). From pluto2060/CTX.
Stop
Runs when the agent finishes a response, executing review_gate.py. From barkaaa/codex-gate.
PostToolUse
Runs after a tool call finishes for Grep tool calls, executing g2-fallback.py via python3. From pluto2060/CTX.
SessionStart
Runs when a session starts on startup, resume, clear and compact, executing session-start.sh via bash. From viktorinkov/shook.