Budgeted agent preflight: allow|block|reuse|defer|advise. Never executes destination tools. Free MCP
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First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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Directories
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2
Tools
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| check_request | Validate an HTTP API request body against a supplied JSON Schema before sending it. This tool does not execute the request. Use it when an agent needs to determine whether a proposed JSON body satisfies its expected schema. Optional economics adds proceed/abort advice from expected waste versus a $0.002 check. | Read-only |
| preflight_tool_call | Free MCP decision for generic search:web_search or browse:fetch proposals only. Returns structuredContent and JSON text, never destination results. Caller supplies cost estimates, post-consultation budget and history, executes tools and retrieves resultReference itself. Reuse requires explicit permission, positive TTL and matching nonempty goal hashes; history must belong to the caller. estimated fees/savings are hypothetical, not receipts; confidence is not calibrated. Paid HTTP is a separate $0.002 per settled POST interface. Full contract: https://agent-preflight.com/docs | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | Agent Preflight | - | 2 Oct 2026 |