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A2A Inspector —
validate any Agent Card in seconds.
Enter any domain and fetch its Agent2Agent (A2A) card from /.well-known/agent-card.json. See the skills, protocolVersion, securitySchemes, and transports another agent would negotiate — exactly as the Linux Foundation spec defines them.
Specs and transports covered
What it shows you
Agent Card validation
Fetches the card from /.well-known/agent-card.json, verifies it parses as a structurally valid A2A card, and lays out identity, service endpoint, protocolVersion, and transports — everything a client agent reads before first contact.
Skills breakdown
Renders every skill with its id, name, description, and tags — the exact advertisement routing LLMs use to decide whether to engage your agent. Vague skills are the #1 reason working A2A agents get no traffic.
Security scheme parsing
Decodes securitySchemes in their OpenAPI 3 format — openIdConnect discovery URLs, oauth2 flows, apiKey, and HTTP bearer — so you can see exactly how a client is expected to authenticate before opening a task.
Legacy path detection
Also checks the pre-0.3.0 location /.well-known/agent.json and flags cards still served only from the legacy path, so you know when a migration to agent-card.json is due.
Capabilities and modes
Shows declared protocol capabilities (streaming, pushNotifications) and default input/output media types, so integration mismatches surface before the first task fails mid-stream.
Full report download
Download the parsed card, raw JSON, and the complete three-protocol scan result as one report file for partner documentation or integration reviews. Pro feature.
Agent Card fields parsed
Who uses it
A2A agent developers
Validate your card from a cold client before announcing it: correct path, parseable JSON, live service endpoint, and skills descriptive enough for routing LLMs to actually select your agent.
Partner integration engineers
About to integrate a partner's A2A agent? Inspect their card first — protocolVersion compatibility, auth expectations, and streaming support — before writing a line of client code.
Agent platform teams
Running a registry or marketplace of agents? Spot-check that listed agents still serve valid cards and that securitySchemes point at resolvable OpenID Connect discovery documents.