# log_change

Log a code change to the persistent change ledger. Models MUST call this after modifying files. Enables cross-session coherence.

Agent View of the PolicyLayer registry record for `log_change`. HTML page: https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/log-change

## Facts

- Tool: `log_change`
- Server: Mcp Dev (`2loch-ness6/mempalace-mcp-dev`) — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev.md
- Homepage: https://github.com/2loch-ness6/mempalace-mcp-dev
- Risk category: Write (Medium risk)
- Registry record: grade D, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "log_change",
    "arguments": {}
  }
}
```

## Why log_change is rated Medium

This tool writes entries to a persistent change ledger. It creates/appends records rather than modifying code directly, and the action is reversible (log entries could be removed). It is not destructive, financial, or executable in the code-execution sense. Severity is medium because a misused or spammed log could corrupt cross-session coherence and mislead the AI about the state of the codebase.

From the tool's own definition: "'Log a code change to the persistent change ledger' and 'Models MUST call this after modifying files'"

## Use case

AI agents use log_change to create or update resources in Mcp Dev, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Dev environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mcp Dev:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "log_change": {
      "limits": [
        {
          "counter": "log_change_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Mcp Dev (18)

- `run_tests` — Execute — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/run-tests.md
- `run_typecheck` — Execute — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/run-typecheck.md
- `get_all_changes` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-all-changes.md
- `get_branch_context` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-branch-context.md
- `get_changed_files` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-changed-files.md
- `get_file_ledger` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-file-ledger.md
- `get_git_diff` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-git-diff.md
- `get_session_changes` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-session-changes.md
- `get_track_index` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-track-index.md
- `get_track_plan` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-track-plan.md
- `get_track_spec` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/get-track-spec.md
- `list_tracks` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/list-tracks.md
- `search_code` — Read — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/search-code.md
- `create_track` — Write — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/create-track.md
- `mine_changed_files` — Write — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/mine-changed-files.md
- `update_track_index` — Write — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/update-track-index.md
- `update_track_plan` — Write — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/update-track-plan.md
- `update_track_spec` — Write — https://policylayer.com/tools/2loch-ness6-mempalace-mcp-dev/update-track-spec.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=2loch-ness6-mempalace-mcp-dev · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/2loch-ness6-mempalace-mcp-dev