Hooks

What modelharness runs automatically, and when. A hook is a command Claude Code fires at a fixed moment, without you asking for it.

vitaliikapliuk@vitaliikapliuk

GitHub

From plugin

modelharness

363 skills1 agent3 commands1 hook

Install

> /plugin marketplace add vitaliikapliuk/modelharness
> /plugin install modelharness@modelharness

Ships with modelharness. Installing the plugin gets these hooks.

What fires, and when

SessionStart

Fires once when a session begins, and again after a context compaction. It is where a plugin sets up its environment, or restores state the compaction dropped.

Matchesstartup|resume|clear|compact"${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"

Read hooks/hooks.json

Where it lives

hooks/session-start.shRunsGitHub

Read the script

#!/usr/bin/env bash
# SessionStart hook: stdout is appended to Claude's context at session start.
set -euo pipefail
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cat "${DIR}/../core/modelharness-core.md"

Read the script before you install anything that runs on your machine. This is the one part of a plugin that acts without being asked.

Ships withmodelharness

Make every model cheaper or better. Measured on four Claude models — none got worse. What it actually is: a zero-config Claude Code plugin.

Get the whole plugin

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