AI agents call detect_fatal_assumption to retrieve information from Trigvale without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs validation analysis by identifying and returning information about critical assumptions. It has no side effects, creates no data modifications, executes no external operations, and performs no deletions. It is purely analytical and informational in nature, consistent with the Read category for tools that retrieve or query data.
From the tool's definition Tool returns analysis of assumptions without modifying any state. The description states it 'Returns ONLY the single most load-bearing assumption' — a read operation that queries and retrieves evaluative data.
Attacks that exploit this kind of access
Returns ONLY the single most load-bearing assumption — what would have to be true for the idea to work, plus why it. It is categorised as a Read tool in the Trigvale MCP Server, which means it retrieves data without modifying state.
Register the Trigvale MCP server in PolicyLayer and add a rule for detect_fatal_assumption: 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 Trigvale. Nothing to install.
detect_fatal_assumption is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the detect_fatal_assumption 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 detect_fatal_assumption. 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.
detect_fatal_assumption is provided by the Trigvale MCP server (sydacos-development/trigvale-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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