Send a chat completion through P402
Part of the P402 server.
Free to start. No card required.
AI agents use p402_chat to create or modify resources in P402. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call p402_chat repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach P402.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"p402_chat": {
"limits": [
{
"counter": "p402_chat_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full P402 policy for all 7 tools.
These attack patterns abuse exactly the kind of access p402_chat gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Send a chat completion through P402. It is categorised as a Write tool in the P402 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the P402 MCP server in PolicyLayer and add a rule for p402_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 P402. Nothing to install.
p402_chat 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 p402_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.
Set action: deny in the PolicyLayer policy for p402_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.
p402_chat is provided by the P402 MCP server (@p402/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 P402 tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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