Fetch ACP discovery [fail]! ACP discovery content type "text/html; charset=utf-8" is not JSON-compatible.INFOFetch ACP discovery status="fail"INFOFetch canonical ACP discovery /.well-known/acp.json statusCode=200 contentType="text/html; charset=utf-8" parsed=false error="Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON"FAILCheck canonical ACP discovery response actual=false expected=true canonicalFound=trueFAILACP discovery content type "text/html; charset=utf-8" is not JSON-compatible.Validate ACP discovery shape [fail]! ACP discovery could not be parsed.INFOValidate ACP discovery shape status="fail"INFOValidate ACP protocol object, name, date version, and supported_versions orderingFAILCheck protocol object and name actual={"hasProtocol":false} expected={"hasProtocol":true,"protocolName":"acp"}FAILCheck protocol version history actual={"supportedVersionCount":0,"supportedVersionsOrdered":false,"supportedVersionsEndWithCurrent":false} expected="date version with chronological supported_versions ending in current version"FAILACP discovery could not be parsed.Review ACP cache and retry metadata [warning]! ACP discovery is missing Cache-Control guidance.INFOReview ACP cache and retry metadata status="warning"INFOInspect ACP discovery cache headers and retry guidance statusCode=200 cacheControl=null retryAfter=nullWARNCheck Cache-Control header on successful discovery actual="missing" expected="present for cacheable public discovery"WARNCheck Retry-After on rate-limit or unavailable responses actual="not required" expected="present only for 429 or 503"WARNACP discovery is missing Cache-Control guidance.

Validate Wildcard schema shape [fail]! agents.json response is not valid JSON.INFOValidate Wildcard schema shapeINFOParse agents.json and classify contract shape shape="unknown"FAILCompare contract shape actual="unknown" expected="wildcard"FAILCompare missing required schema fields actual="none" expected="none"FAILCompare Content-Type with JSON expectation actual=false expected=trueFAILagents.json response is not valid JSON.Validate API actions [fail]! Wildcard agents.json must include valid OpenAPI-derived action or operation definitions.INFOValidate API actionsFAILCompare API action count actual=0 expected="> 0"FAILCompare invalid action definitions actual=0 expected=0FAILWildcard agents.json must include valid OpenAPI-derived action or operation definitions.Validate flows and links [fail]! No executable flows were found.INFOValidate flows and linksFAILCompare workflow flow count actual=0 expected="> 0"FAILCompare operation link issues actual=0 expected=0FAILNo executable flows were found.Review examples and LLM usability [warning]! Examples or descriptions are too thin for reliable agent argument generation.INFOReview examples and LLM usabilityWARNCompare usable example count actual=0 expected="> 0 when actions are present"WARNExamples or descriptions are too thin for reliable agent argument generation.

Discover A2A Agent Card [warning]! The A2A Agent Card was found at a legacy or fallback path.INFODiscover A2A Agent CardINFOTry A2A discovery paths in priority order paths=["/.well-known/agent-card.json","/.well-known/agent.json","/agent-card.json","/.well-known/a2a/agent-card.json"]WARNA2A candidate path did not return a usable card path="/.well-known/agent-card.json" statusCode=429 contentType=nullWARNA2A candidate path did not return a usable card path="/.well-known/agent.json" statusCode=429 contentType=nullPASSFound an A2A candidate path="/agent-card.json" statusCode=200 contentType="text/html; charset=utf-8" bytes=17403WARNA2A candidate path did not return a usable card path="/.well-known/a2a/agent-card.json" statusCode=429 contentType=nullWARNSelected non-canonical A2A Agent Card path="/agent-card.json" pathClass="fallback" requestedUrl="https://yarn.social/agent-card.json"WARNThe A2A Agent Card was found at a legacy or fallback path.Detect A2A card version [fail]! The discovered JSON document does not match a supported A2A Agent Card version family.INFODetect A2A card versionINFORead version indicators from the card detectionEvidence=[]FAILCompare detected A2A version family actual="unknown" expected="v0.1, v0.2, v0.3, or v1"FAILThe discovered JSON document does not match a supported A2A Agent Card version family.Validate version-specific card shape [fail]! A2A Agent Card response is not valid JSON.INFOValidate version-specific card shapeFAILCompare missing required card fields actual="none" expected="none"FAILCheck every declared A2A skill has required name, description, and endpoint fields actual=0 expected=0 invalidSkills=[]INFOReview declared endpoint interfaces interfaces=[]FAILA2A Agent Card response is not valid JSON.Validate HTTP delivery [warning]! The card was parseable JSON but was not served with a JSON-compatible content type.INFOValidate HTTP deliveryWARNCompare card Content-Type with JSON expectation actual="text/html; charset=utf-8" expected="application/json or +json"INFOReview selected discovery path path="/agent-card.json" pathClass="fallback"WARNHTTP delivery/path warning warning="card was found only at a non-standard fallback path"WARNThe card was parseable JSON but was not served with a JSON-compatible content type.Probe same-origin A2A endpoint [warning]! A2A endpoint probing was skipped because the endpoint was cross-origin, unavailable from the card, or uses an unsupported binding.INFOProbe same-origin A2A endpointINFOProbe same-origin A2A endpoint when scanner policy allows itSKIPSkipped endpoint probe reason="No valid A2A card was available to probe."WARNA2A endpoint probing was skipped because the endpoint was cross-origin, unavailable from the card, or uses an unsupported binding.