agentmods.dev

PreToolUse

A pre-tool hook that runs a Basecamp snapshot command before each Bash command used by the agent.

In plain words
What is it for?
It is for automatically running that snapshot step whenever the agent is about to use Bash.
Why use it?
It creates a snapshot before shell operations, which can help preserve a recoverable state before changes are made.

Hook

259 2d ago A scan tokens not measured original MIT
View the source file basecamp/basecamp-cli
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add hooks/basecamp/basecamp-cli/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/basecamp/basecamp-cli
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

PreToolUse 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 2d 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.

hooks/hooks.json · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "basecamp agent-hook pre-commit-snapshot",
          "timeout": 10
        }
      ]
    }
  ]
}
Changes

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.

  1. 2d ago First seen · 14 lines scan A 4d5324fa7a6a

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository basecamp/basecamp-cli (259 stars, last pushed 2d ago), licensed MIT. 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 2026-08-30.

Git and workflowagent-skillsbasecamp
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash, Read, Write, Edit, MultiEdit, Skill, Skill, Agent, Edit, Write and MultiEdit tool calls, executing safety-spine.mjs, gate-intake.mjs, harness.mjs and sandbox-guard.mjs via node (4 commands). From nguyenvanphituoc/shapeup-sdlc-plugin.

nguyenvanphituoc/shapeup-sdlc-plugin · not measured

PostToolUse

Runs after a tool call finishes for Skill and Agent tool calls, executing dispatch-receipt.mjs via node. From nguyenvanphituoc/shapeup-sdlc-plugin.

nguyenvanphituoc/shapeup-sdlc-plugin · not measured

SessionStart

Runs when a session starts, running an inline shell check. From nguyenvanphituoc/shapeup-sdlc-plugin.

nguyenvanphituoc/shapeup-sdlc-plugin · not measured

PostToolUse

Runs after a tool call finishes for TodoWrite tool calls, executing sync-todos.sh. From keskinonur/claude-plugin-fizzy.

keskinonur/claude-plugin-fizzy · not measured

Stop

Runs when the agent finishes a response, executing gate-zerowork.mjs via node. From nguyenvanphituoc/shapeup-sdlc-plugin.

nguyenvanphituoc/shapeup-sdlc-plugin · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured