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skilled-agent-harness_spec-driven-loops: Hook for Claude Code

.claude/settings.json

PreCompact is a hook for Claude Code from MichelKerkmeester/skilled-agent-harness_spec-driven-loops. Its token cost is not measured, scanned A, original, MIT.

A session hook that runs a script before an agent's conversation context is shortened. It injects information from the current work into the shortened context.

In plain words
What is it for?
Use it in agent workflows that need context-preservation logic before compaction.
Why use it?
It helps preserve useful project context when the conversation becomes too long for the agent to keep in full.

Hook for Claude Code

Written for Claude Code: ${CLAUDE_PROJECT_DIR variable. Also seen: mentions OpenCode.

This is MichelKerkmeester/skilled-agent-harness_spec-driven-loops's own configuration. It tells Claude Code how to work on skilled-agent-harness_spec-driven-loops itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything skilled-agent-harness_spec-driven-loops configures →

One of 8 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 7 are separate, each on its own page.

not rated 35repo +1 changed yesterday A scan tokens not measured original MIT
View source ↗ MichelKerkmeester/skilled-agent-harness_spec-driven-loops
Reuse

Borrowing it

Nothing to install: this file belongs to MichelKerkmeester/skilled-agent-harness_spec-driven-loops. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loops/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loops

Made for: Claude Code.

Wrote 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.

agentmods badge for PreCompact

README.md
[![agentmods](https://agentmods.dev/badge/hooks/michelkerkmeester/skilled-agent-harness_spec-driven-loops/pre-compact.svg)](https://agentmods.dev/hooks/michelkerkmeester/skilled-agent-harness_spec-driven-loops/pre-compact)
Your own site
<a href="https://agentmods.dev/hooks/michelkerkmeester/skilled-agent-harness_spec-driven-loops/pre-compact"><img src="https://agentmods.dev/badge/hooks/michelkerkmeester/skilled-agent-harness_spec-driven-loops/pre-compact.svg" alt="Measured on agentmods" height="20"></a>
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. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

PreCompact 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 yesterday.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.claude/settings.json · 14 lines

What it actually says

{
  "PreCompact": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "bash -c 'cd \"${CLAUDE_PROJECT_DIR:-$PWD}\" && node .opencode/skills/system-spec-kit/runtime/dist/hooks/claude/compact-inject.js || { printf \"%s\\n\" \"mk-hook-drift host=claude event=PreCompact adapter=compact-inject.js\" >&2; printf %s \"{\\\"hookSpecificOutput\\\":{\\\"hookEventName\\\":\\\"PreCompact\\\",\\\"additionalContext\\\":\\\"mk claude hook could not resolve; rebuild the spec-kit runtime or restore the missing adapter\\\",\\\"mkHookDrift\\\":true}}\"; }'",
          "timeout": 3
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 8. Installing the file brings all of them; each is measured and scanned on its own page.

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. yesterday Changed 8faa7f9c9420
  2. 3d ago Changed 93932b606e7b
  3. 7d ago First seen · 14 lines scan A ebdad43e5db3

Subscribe to this mod's changes

PreCompact is a hook published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (35 stars, last pushed today), 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 2026-09-01.

Building agents
Related

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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

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured

PreCompact

Runs before the context is compacted for manual and auto tool calls, executing hook-handler.cjs via node (4 commands). From ruvnet/RuView.

ruvnet/RuView · not measured