// MCP TOOL REFERENCE

fs_stop_watch

Stop watching a directory

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

@ai-capabilities-suite/mcp-filesystem Execute Risk 3/5

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke fs_stop_watch to trigger processes or run actions in Mcp Filesystem. 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 FS_STOP_WATCH

fs_stop_watch 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-digital-defiance-mcp-filesystem.yaml

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

See the full Mcp Filesystem policy for all 12 tools.

// DETAILS

Tool Name fs_stop_watch

Category Execute

MCP Server Mcp Filesystem MCP Server

Risk Level High

// MORE MCP FILESYSTEM TOOLS

Execute fs_batch_operations Execute fs_build_index Write fs_copy_directory Write fs_create_symlink Read fs_analyze_disk_usage Read fs_compute_checksum Read fs_get_watch_events Read fs_search_files

View all 12 tools →

// WHAT CAN GO WRONG

Agents calling execute-class tools like fs_stop_watch 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

fs_stop_watch is one of the high-risk operations in Mcp Filesystem. 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 fs_stop_watch tool do? +

Stop watching a directory. It is categorised as a Execute tool in the Mcp Filesystem MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fs_stop_watch? +

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

What risk level is fs_stop_watch? +

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

Can I rate-limit fs_stop_watch? +

Yes. Add a rate_limit block to the fs_stop_watch 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 fs_stop_watch completely? +

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

fs_stop_watch is provided by the Mcp Filesystem MCP server (@ai-capabilities-suite/mcp-filesystem). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

fs_stop_watch

Enforce policies on Mcp Filesystem