# MCP Tool Result Check

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Inspect a supplied MCP CallToolResult text/structured-content envelope and optional object-root output schema. Separates tool execution errors, missing structured output, invalid text blocks and unsupported content/schema features. Does not invoke tools or prove MCP interoperability, provenance, or trust.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Validate MCP tool result structuredContent against outputSchema
- Distinguish tool execution error from malformed tool result envelope

## Outside this profile
- MCP lifecycle, JSON-RPC correlation, binary/media/resources, annotation validation or security verdicts
- Full JSON Schema or trusting tool output because its shape passes

Proposed nominal USD 0.01 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/mcp-result-check.json)
- [Input schema](/reference/schemas/mcp-result-check.input.json)
- [Output schema](/reference/schemas/mcp-result-check.output.json)
- [Fixed example](/reference/examples/mcp-result-check.json)
- [Complete HTML reference](/discover/tools/mcp-result-check)