// MCP TOOL REFERENCE

comet_stop

Stop the current agent task if it's going off track

Part of the Perplexity Comet MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke comet_stop to trigger processes or run actions in Perplexity Comet. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.

// WHY ENFORCE A POLICY ON COMET_STOP

comet_stop can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. Intercept enforces rate limits and validates arguments to keep execution within safe bounds.

// RECOMMENDED POLICY

Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.

io-github-rapiercraft-perplexity-comet-mcp.yaml

tools:
  comet_stop:
    rules:
      - action: allow
        rate_limit:
          max: 10
          window: 60
        validate:
          required_args: true

See the full Perplexity Comet policy for all 8 tools.

// DETAILS

Tool Name comet_stop

Category Execute

MCP Server Perplexity Comet MCP Server

Risk Level High

// MORE PERPLEXITY COMET TOOLS

Write comet_connect Write comet_tabs Write comet_upload Read comet_ask Read comet_mode Read comet_poll Read comet_screenshot

// WHAT CAN GO WRONG

Agents calling execute-class tools like comet_stop have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER EXECUTE TOOLS ACROSS MCP SERVERS

Other tools in the Execute risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

Agent Passport System — Cryptographic Identity for AI Agents commerce_preflight Agent Passport System — Cryptographic Identity for AI Agents execute_with_context Agent Passport System — Cryptographic Identity for AI Agents gateway_execute_approval Agent Passport System — Cryptographic Identity for AI Agents governance_360 Agent Passport System — Cryptographic Identity for AI Agents parse_governance_block_html AgentClear — API Marketplace for AI Agents call_service

// IN CONTEXT OF HIGH RISK

comet_stop is one of the high-risk operations in Perplexity Comet. For the full severity-focused view — only the high-risk tools with their recommended policies — see the breakdown for this server, or browse all high-risk tools across every MCP server.

// RELATED READING

// FAQ

What does the comet_stop tool do? +

Stop the current agent task if it's going off track. It is categorised as a Execute tool in the Perplexity Comet MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on comet_stop? +

Add a rule in your Intercept YAML policy under the tools section for comet_stop. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Perplexity Comet MCP server.

What risk level is comet_stop? +

comet_stop is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit comet_stop? +

Yes. Add a rate_limit block to the comet_stop rule in your Intercept 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 comet_stop completely? +

Set action: deny in the Intercept policy for comet_stop. 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 comet_stop? +

comet_stop is provided by the Perplexity Comet MCP server (perplexity-comet-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

comet_stop

Enforce policies on Perplexity Comet