Append a line to an active glasses note session. If session_id is omitted, the most-recent active session for the device is used.
AI agents use crow_glasses_add_to_note to create or update resources in Crow — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Crow environment.
This tool creates or modifies data reversibly: appending content to a note can be edited or deleted later. It does not execute arbitrary code, delete data irreversibly, or move money. The 'medium' severity reflects that an AI agent could pollute or spam notes with unwanted content, but the impact is limited to a single user's notes and is reversible.
From the tool's definition "Append a line to an active glasses note session" — the tool modifies existing data (a note) by appending content to it.
Documented attack patterns abuse exactly the kind of access crow_glasses_add_to_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for crow_glasses_add_to_note:
{
"version": "1",
"default": "deny",
"tools": {
"crow_glasses_add_to_note": {
"limits": [
{
"counter": "crow_glasses_add_to_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}crow_glasses_add_to_note stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Append a line to an active glasses note session. If session_id is omitted, the most-recent active session for the device is used. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Crow MCP server in PolicyLayer and add a rule for crow_glasses_add_to_note: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Crow. Nothing to install.
crow_glasses_add_to_note is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the crow_glasses_add_to_note rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for crow_glasses_add_to_note. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
crow_glasses_add_to_note is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.