watchers.http-headers

WATCHER: get a signed callback when a website\

SERVERMcp SOURCE@2sio/mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-2s-io-mcp/watchers.http-headers.md

WHAT IT DOES

What watchers.http-headers does on Mcp

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

RISK

Why watchers.http-headers is rated Low

This tool retrieves HTTP header information from a website and delivers it via signed callback. It performs data retrieval (headers from a web resource) without modifying data, executing arbitrary operations, or creating side effects beyond the callback itself. No financial, destructive, or code execution capabilities are evident.

From the tool's definition Tool name 'watchers.http-headers' and description 'WATCHER: get a signed callback when a website' indicate monitoring/observation of HTTP headers from a website.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs watchers.http-headers safely

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

watchers.http-headers Allowed

watchers.http-headers 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": {
    "watchers.http-headers": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp, apply this rule, and every watchers.http-headers call is checked against it from then on.

FAQ

Questions about watchers.http-headers

What does the watchers.http-headers tool do? +

WATCHER: get a signed callback when a website\. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on watchers.http-headers? +

Register the MCP server in PolicyLayer and add a rule for watchers.http-headers: 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 Mcp. Nothing to install.

What risk level is watchers.http-headers? +

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

Can I rate-limit watchers.http-headers? +

Yes. Add a rate_limit block to the watchers.http-headers 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 watchers.http-headers completely? +

Set action: deny in the PolicyLayer policy for watchers.http-headers. 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 watchers.http-headers? +

watchers.http-headers is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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