chat

A read tool on the A2a Cloud MCP server.

SERVERA2a Cloud SOURCErobGetsTheJobDone/a2a-cloud

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/a2a-cloud/chat.md

WHAT IT DOES

What chat does on A2a Cloud

AI agents call chat to retrieve information from A2a Cloud without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why chat is rated Low

The tool sits in a calendar query/integration context where all other named tools (check_availability, detect_conflicts, get_calendar_context, get_github_*) are read operations. An empty description reduces confidence, but the naming pattern and server purpose suggest this facilitates read-only dialogue about calendar state.

From the tool's definition Tool name is 'chat' with empty description. Given the server context ('natural language queries about availability, upcoming events, schedule conflicts, and meeting summaries'), this appears to be a conversational interface for querying calendar data rather…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs chat safely

PolicyLayer is an MCP gateway: it sits between your AI agents and A2a Cloud, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For chat, this is the rule to start with:

chat Allowed

chat is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "chat": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect A2a Cloud, apply this rule, and every chat call is checked against it from then on.

FAQ

Questions about chat

What does the chat tool do? +

chat is a read tool on the A2a Cloud MCP server. It is categorised as a Read tool in the A2a Cloud MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on chat? +

Register the A2a Cloud MCP server in PolicyLayer and add a rule for chat: 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 A2a Cloud. Nothing to install.

What risk level is chat? +

chat is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit chat? +

Yes. Add a rate_limit block to the chat 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.

How do I block chat completely? +

Set action: deny in the PolicyLayer policy for chat. 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.

What MCP server provides chat? +

chat is provided by the A2a Cloud MCP server (robGetsTheJobDone/a2a-cloud). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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