AI agents invoke cancel_build to trigger actions in Komodo MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool terminates an active build process. It triggers an external operation (cancellation) that affects a running build pipeline. It's not purely destructive (no data is permanently deleted), but it executes an action that interrupts an ongoing process with real operational consequences.
From the tool's definition Cancela un build en ejecución (Cancels a running build)
Documented attack patterns abuse exactly the kind of access cancel_build gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Komodo MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel_build:
{
"version": "1",
"default": "deny",
"tools": {
"cancel_build": {
"limits": [
{
"counter": "cancel_build_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}cancel_build stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Cancela un build en ejecución. It is categorised as a Execute tool in the Komodo MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Komodo MCP Server MCP server in PolicyLayer and add a rule for cancel_build: 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 Komodo MCP Server. Nothing to install.
cancel_build is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the cancel_build 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 cancel_build. 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.
cancel_build is provided by the Komodo MCP Server MCP server (nonetss/komodo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Komodo MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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54 Komodo MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.