agentmods.dev

SessionStart

An automatic command that runs a shell script whenever a coding session starts. The script comes from the referenced Mem9 project.

In plain words
What is it for?
Use it for tasks that should happen at session startup, although the available information does not say what the script actually does.
Why use it?
It removes the need to remember or manually run session setup steps at the beginning of each session.

Hook

3 2d ago A scan tokens not measured copy · 63% Apache-2.0
View the source file unvulcanised-watercress762/mem9
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/unvulcanised-watercress762/mem9/session-start
Clone the repo
git clone --depth 1 https://github.com/unvulcanised-watercress762/mem9
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 63% 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 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

This is a copy

63% identical to SessionStart — 5 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.

claude-plugin/hooks/hooks.json · 12 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"
        }
      ]
    }
  ]
}
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 First seen · 12 lines scan A 6489094dc043

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository unvulcanised-watercress762/mem9 (3 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. It is 63% identical to SessionStart, differing in 5 lines, and is treated as a copy.

ChatbotsMemory and contextagentsaiai-memoryanthropicchatgpt
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Write, Edit, MultiEdit, mcp__mem0__add_memory, mcp__plugin_mem0_mem0__add_memory, mcp__mem0__search_memories, mcp__plugin_mem0_mem0__search_memories, mcp__mem0__get_memories, mcp__plugin_mem0_mem0__get_memories, mcp__mem0__delete_all_memories…

mem0ai/mem0 · not measured

SessionStart

Runs when a session starts on startup, resume and compact, executing ensure_deps.sh and on_session_start.sh (2 commands). From mem0ai/mem0.

mem0ai/mem0 · not measured

PostToolUse

Runs after a tool call finishes for mcp__mem0__.*, mcp__plugin_mem0_mem0__.* and Bash tool calls, executing on_post_tool_use.sh and on_bash_output.sh (2 commands). From mem0ai/mem0.

mem0ai/mem0 · not measured

PreCompact

Runs before the context is compacted, executing on_pre_compact.sh. From mem0ai/mem0.

mem0ai/mem0 · not measured

SessionStart

Runs when a session starts, executing session_start.py via python3. From vectorize-io/hindsight.

vectorize-io/hindsight · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing recall.py via python3. From vectorize-io/hindsight.

vectorize-io/hindsight · not measured