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: ChainHost
Agent version: 1.0.0
Transport: JSONRPC
Endpoint: https://chainhost.online
Card shape: pre-v1.0
Location: standard location
Skills: 0
Response time: 138 ms

Findings

ErrorRequired field missing: defaultInputModesdefaultInputModes
ErrorRequired field missing: defaultOutputModesdefaultOutputModes
ErrorRequired field missing: protocolVersionprotocolVersion
ErrorRequired field missing: provider.organizationprovider.organization
ErrorRequired field missing: skills[0].idskills[0].id
ErrorRequired field missing: skills[0].tagsskills[0].tags
ErrorRequired field missing: skills[1].idskills[1].id
ErrorRequired field missing: skills[1].tagsskills[1].tags
ErrorRequired field missing: skills[2].idskills[2].id
ErrorRequired field missing: skills[2].tagsskills[2].tags
ErrorRequired field missing: skills[3].idskills[3].id
ErrorRequired field missing: skills[3].tagsskills[3].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

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"]
```
protocolVersionThe A2A version the agent speaks, in the shape used before v1.0.
```
"protocolVersion": "0.3"
```

provider.organizationThe name of the organization behind the agent.

"provider": {"organization": "ACME", "url": "https://acme.example"}

skills[0].idA stable identifier for the skill, unique within the agent.
```
"id": "suggest-recipe"
```
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].idA stable identifier for the skill, unique within the agent.
```
"id": "suggest-recipe"
```
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

No skill declared.

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/aHR0cHM6Ly9jaGFpbmhvc3Qub25saW5l.svg)](https://kopass.app/a2a/validator?url=https://chainhost.online)

HTML

<a href="https://kopass.app/a2a/validator?url=https://chainhost.online"><img src="https://kopass.app/a2a/badge/aHR0cHM6Ly9jaGFpbmhvc3Qub25saW5l.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: 228 agents followed, 220 of which answered on the last pass.

Find an agent by capability