Let MCP agents buy and verify endpoint evidence - #183
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MCP agents could discover the paid endpoint-evidence offer but had no MCP tool to buy or verify it. Adds
guild_evidence_bundleand freeguild_evidence_verify, sharing HTTP's exact request binding, price, evidence format and completed-purchase recovery. Bumps the additive interface to 2.7.0 and regenerates the published contract.Issuance runs only after non-settling eligibility and before authorization charges. Completed x402 purchases recover saved bytes across MCP and HTTP without fresh probes or settlement. Signed artifacts bypass inbox decoration. MCP text now contains the actual JSON result or challenge instead of a nested content-block array. A zero issuance quota returns a pre-charge refusal instead of crashing.
Discovery and documentation describe the issuer's observation and limitations, retain the free preflight alternative, and remove unsupported claims of proven endpoint truth or guaranteed trust outcomes. This repairs an advertised purchase path; it does not establish customer demand.
Validation: full local JSON suite 2,101 passed, 10 skipped, including both storage backends for the new buyer cases and the independent Node receipt verifier. A fresh MCP client consumes the served quote, rejects expired authorization, completes a synthetic purchase and verifies its artifact. Coverage includes both payment carriers, restart and cross-transport recovery, altered credentials, quota/issuance refusal, post-settlement errors, signed payload integrity, free verification and generated-contract parity. Full protected CI remains required. No real-money purchase is part of these tests.