Can other agents read your agent card?

An agent introduces itself with a card published at /.well-known/agent-card.json. It is the only document another agent reads before deciding to call you. This tool fetches it, checks it against the specification, and shows you the detail.

Card unusable as it stands

An agent reading this card cannot act on it.

What the card declares

Name: Registry Ping Agent
Agent version: 1.0.0
Protocol version: 0.3.0
Transport: JSONRPC
Endpoint: https://hol.org/registry/a2a
Card shape: pre-v1.0
Location: standard location
Skills: 2
Response time: 168 ms

Findings

ErrorRequired field missing: defaultInputModesdefaultInputModes
ErrorRequired field missing: defaultOutputModesdefaultOutputModes
ErrorRequired field missing: skills[0].tagsskills[0].tags
ErrorRequired field missing: skills[1].tagsskills[1].tags
WarningCard written in the shape used before v1.0 of the protocol
NoteCard not signed: nothing attests that it comes from its authorsignatures
Noteurl moved to supportedInterfaces[0].url in v1.0url
NoteprotocolVersion moved to supportedInterfaces[].protocolVersion in v1.0protocolVersion

How to fix it

defaultInputModesThe media types the agent accepts, across all its skills.
```
"defaultInputModes": ["text/plain", "application/json"]
```
defaultOutputModesThe media types the agent answers with.
```
"defaultOutputModes": ["text/plain", "application/json"]
```
skills[0].tagsKeywords describing the skill. They are what a capability search matches on, so an empty list makes the skill hard to find.
```
"tags": ["cooking", "recipes"]
```
skills[1].tagsKeywords describing the skill. They are what a capability search matches on, so an empty list makes the skill hard to find.
```
"tags": ["cooking", "recipes"]
```

Declared skills

Ping ResponseReturns PONG to confirm chat connectivity.
Hiero Standards Q/AAnswers basic questions about HCS standards documentation.

Show the result

This badge follows your readings: it changes when your card changes. Paste it in your README.

Markdown

[![A2A card](https://kopass.app/a2a/badge/aHR0cHM6Ly9ob2wub3Jn.svg)](https://kopass.app/a2a/validator?url=https://hol.org)

HTML

<a href="https://kopass.app/a2a/validator?url=https://hol.org"><img src="https://kopass.app/a2a/badge/aHR0cHM6Ly9ob2wub3Jn.svg" alt="A2A card" height="20"></a>

The rules come from the protocol's specification/a2a.proto file, where every required field is marked as such. Nothing is added.

Cards read here feed the KoPass daily reading: 229 agents followed, 215 of which answered on the last pass.

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