What is SessionStart?

A session-start hook that runs a shell script when a Claude Code session begins. The script synchronises a binary from the jeongph/claude-telemetry project.

Use it to trigger that synchronisation script whenever a new session starts.

It ensures the telemetry binary is synchronised automatically at the start of each session.

SessionStart — Hook for coding agents by jeongph: A session-start hook that runs a shell script when…

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add jeongph/claude-telemetry

Claude Code

/plugin install claude-telemetry

Or install claude-telemetry, the plugin that ships this one along with the rest of its 3 commands, 1 hook.

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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/jeongph/claude-telemetry/session-start.svg)](https://agentmods.dev/hooks/jeongph/claude-telemetry/session-start)

Your own site

<a href="https://agentmods.dev/hooks/jeongph/claude-telemetry/session-start"><img src="https://agentmods.dev/badge/hooks/jeongph/claude-telemetry/session-start.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. Scan, not verified.

Origin 52% copy Near-identical to another mod 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 3d 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.

Origin

This is a copy

52% identical to SessionStart — 7 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

hooks/hooks.json · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/scripts/sync-binary.sh",
          "timeout": 15
        }
      ]
    }
  ]
}

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.

3d ago First seen · 14 lines scan A 3a364e48c26f

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository jeongph/claude-telemetry (5 stars, last pushed 1mo 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. It is 52% identical to SessionStart, differing in 7 lines, and is treated as a copy.

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SessionStart

Getting it into your agent

Wrote this? Show the measurements

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

SessionStart

SessionStart

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