Hooks
What meridian runs automatically, and when. A hook is a command Claude Code fires at a fixed moment, without you asking for it.
$ npx -y skills add markmdev/meridian --agent claude-codeShips with meridian. 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.
- Matches
startup|clear|compactpython3 "${CLAUDE_PLUGIN_ROOT}/scripts/context-injector.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/session-cleanup.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/save-injected-files.py"
Stop
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/work-until-stop.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/stop-checklist.py"
PostToolUse
- Matches
*python3 "${CLAUDE_PLUGIN_ROOT}/scripts/action-counter.py" - Matches
ExitPlanModepython3 "${CLAUDE_PLUGIN_ROOT}/scripts/plan-approval-reminder.py"
PreToolUse
- Matches
Taskpython3 "${CLAUDE_PLUGIN_ROOT}/scripts/reviewer-root-guard.py"
UserPromptSubmit
Fires before Claude sees each prompt you send. A plugin can use it to inject context, so the same instruction reaches the model every turn instead of only at session start.
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/action-counter.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/plan-mode-tracker.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/instruction-reminder.py"
PreCompact
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/session-transcript.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/session-learner.py"
SessionEnd
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/session-learner.py"python3 "${CLAUDE_PLUGIN_ROOT}/scripts/session-transcript.py"
In the plugin's words
How meridian describes its own hook set.
Meridian agent enforcement — context injection, planning gates, session learning, quality checks
Meridian makes Claude Code more reliable on real projects. It adds persistent project context, smarter session handoff, and lightweight workflow enforcement so Claude is less likely to lose the plot halfway through a long task.