# Agent Ledger: Hermes Agent plugin

> Write-ahead ledger for agent side effects, with an OWASP Agentic Top 10 posture scorer.

Canonical: https://hermeswatcher.com/plugins/agent-ledger  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/agent-ledger  
Last updated in catalog: 2026-10-13

Write-ahead ledger for agent side effects, with an OWASP Agentic Top 10 posture scorer.

## Good to know before installing

Records the arguments (up to 4000 chars: terminal commands, file contents, MCP args) and a 300-char result digest of every state-changing tool call in a local plaintext SQLite ledger under HERMES_HOME/plugin-data/agent-ledger/ that is never pruned; injects a warning listing this session's unconfirmed calls into the next turn's context; an optional policy engine (off by default; you add policy.json and set policy_mode) can refuse matching tool calls before they run; the optional posture_daily.py script, run from your own cron, sends a score summary to Telegram with the bot token you give it.

From the plugin's catalog listing.

## How to install

1. Install it. Hermes asks for any API keys it needs, then asks whether to turn it on.

```bash
hermes plugins install agent-ledger
```

2. Said no? Turn it on later:

```bash
hermes plugins enable agent-ledger
```

3. Restart Hermes so it loads the plugin.

Some plugins also need a sign-in or settings: see the official page. Memory plugins ask whether to become your memory provider instead. Steps follow the official plugins guide: https://hermes-agent.nousresearch.com/docs/user-guide/features/plugins

## Facts

- Category: Cost, speed & monitoring
- Maintained by: ZidoCode (Community)
- Needs: No API keys declared
- Requires Hermes: `>=0.19.0`
- Version: 0.4.4
- In the catalog since: 2026-10-13

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/agent-ledger)
- [Source code](https://github.com/ZidoCode/agent-ledger#readme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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HermesWatcher is an independent guide. It is not affiliated with or endorsed by Nous Research. The [official Hermes Agent documentation](https://hermes-agent.nousresearch.com/docs) and [repository](https://github.com/NousResearch/hermes-agent) from Nous Research are the authority; each page here lists the official sources it was written from. If this site and the official docs disagree, trust the official docs. Index for agents: https://hermeswatcher.com/llms.txt