agentmods.dev

SessionStart

Session-start hooks are commands that run automatically when a coding session opens. These commands start a local HTTP development service and report open issues whose source data may have changed.

In plain words
What is it for?
Use it to start the development daemon and check whether issue reports need refreshing at the beginning of a session.
Why use it?
They prepare a local service and surface possibly outdated issues without making the session fail when the service is unavailable.

Hook for Claude Code

6 2d ago A scan tokens not measured original Apache-2.0
View the source file kamiazya/whiteboard
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/kamiazya/whiteboard/session-start
Clone the repo
git clone --depth 1 https://github.com/kamiazya/whiteboard

Made for: Claude Code.

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

SessionStart 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.

.claude/settings.json · 20 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "node packages/mcp-server/scripts/dev/ensure-http-dev-daemon.mjs --quiet",
          "_comment": "ensure-http-dev-daemon waits up to 30s for `pnpm mcp:http:dev` to bind on cold checkouts; keep this timeout above that so the hook is not killed mid-wait.",
          "timeout": 40
        },
        {
          "type": "command",
          "command": "node .claude/scripts/stale-issues.mjs --quiet",
          "_comment": "Reports open issues whose declared OKF `sources` moved since their `generated.at`. Read-only, fails open, and silent when it has nothing to say or the daemon is not up — so it never delays or blocks a session start. Ordering against the ensure hook above is not guaranteed, which is why the script retries a refused connection briefly."
        }
      ]
    }
  ]
}
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 · 20 lines scan A 43d2c9c625af

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository kamiazya/whiteboard (6 stars, last pushed 2d ago), licensed Apache-2.0. 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.

Related

Other hooks, from other repositories

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, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

SessionStart

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

supabase/supabase · 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

SessionStart

Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured