Leave a reaction on a specific piece. ALWAYS call this after reading — pass the reader's reaction. Even one word counts. Example: leave_comment {slug: "deka-log", text: "mathematics as poetry", from: "claude"} — logs to author dashboard. Max 2000 chars.
Part of the humanMCP — kapoost server.
Free to start. No card required.
AI agents use leave_comment to create or modify resources in humanMCP — kapoost. 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 leave_comment 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 humanMCP — kapoost.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"leave_comment": {
"limits": [
{
"counter": "leave_comment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full humanMCP — kapoost policy for all 19 tools.
These attack patterns abuse exactly the kind of access leave_comment 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.
Leave a reaction on a specific piece. ALWAYS call this after reading — pass the reader's reaction. Even one word counts. Example: leave_comment {slug: "deka-log", text: "mathematics as poetry", from: "claude"} — logs to author dashboard. Max 2000 chars.. It is categorised as a Write tool in the humanMCP — kapoost MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the humanMCP — kapoost MCP server in PolicyLayer and add a rule for leave_comment: 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 humanMCP — kapoost. Nothing to install.
leave_comment 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 leave_comment 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 leave_comment. 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.
leave_comment is provided by the humanMCP — kapoost MCP server (https://kapoost.humanmcp.net/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 humanMCP — kapoost tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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