Add an expression to the watch list. The expression will be evaluated each time the process pauses.
Risk signalsAccepts freeform code/query input (expression)
Part of the Mcp Debugger server.
Free to start. No card required.
AI agents use debugger_add_watch to create or modify resources in Mcp Debugger. 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 debugger_add_watch 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 Mcp Debugger.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"debugger_add_watch": {
"limits": [
{
"counter": "debugger_add_watch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Mcp Debugger policy for all 29 tools.
These attack patterns abuse exactly the kind of access debugger_add_watch 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.
Add an expression to the watch list. The expression will be evaluated each time the process pauses.. It is categorised as a Write tool in the Mcp Debugger MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Debugger MCP server in PolicyLayer and add a rule for debugger_add_watch: 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 Debugger. Nothing to install.
debugger_add_watch 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 debugger_add_watch 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 debugger_add_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.
debugger_add_watch is provided by the Mcp Debugger MCP server (@ai-capabilities-suite/mcp-debugger-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Mcp Debugger tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.