# DDG Directory Lint — HTTP Message Signatures Directory Validator

> DDG Directory Lint — HTTP Message Signatures Directory Validator is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Fetches and lints a /.well-known/http-message-signatures-directory endpoint, checking JWK shape (OKP/Ed25519), self-signature presence, key freshness, and pinned-agent consistency, returning a per-step pass/fail report.

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/wba/directory-lint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-directory-lint-http-message-signatures-directory-validator-d5ba5d72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-mjIorMUeDbd0Ow3n7V4q

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ddg-directory-lint-http-message-signatures-directory-validator-d5ba5d72 -d '<json body>'
```

Example prompt: Can you lint my agent's HTTP message signatures directory at https://myagent.example.com/.well-known/http-message-signatures-directory and tell me which steps pass or fail — specifically whether the Ed25519 JWK shape is correct, the self-signature is present, the key is fresh, and the pinned-agent is consistent?

## When to prefer this

Use this endpoint when you need to validate that a /.well-known/http-message-signatures-directory is correctly configured for agent-to-agent authentication — specifically when checking Ed25519/OKP JWK compliance, self-signature presence, key freshness, and pinned-agent consistency in a single call. Prefer this over manual inspection or general-purpose HTTP tools when you need a structured, per-step audit report.

## Known failure modes

- Target URL is unreachable or returns non-200 — lint cannot proceed
- Directory is missing required fields — individual step fails with explanation
- Key is expired or stale — key freshness step fails
- Self-signature is absent or invalid — self-signature step fails
- Pinned-agent reference is inconsistent — pinned-agent consistency step fails
- Malformed JWK (wrong curve or key type) — JWK shape step fails

## How this service works

Fetch and lint a /.well-known/http-message-signatures-directory: JWK shape (OKP/Ed25519), self-signature presence, key freshness, and pinned-agent consistency. Per-step pass/fail report.

## Output

A per-step pass/fail report covering: JWK shape validity (OKP/Ed25519), presence of self-signature, key freshness status, and pinned-agent consistency. Each check is individually reported so the caller can identify exactly which aspect of the directory is non-compliant.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": true
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "ok": true
    }
   },
   "additionalProperties": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ddg-directory-lint-http-message-signatures-directory-validator-d5ba5d72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.daedalusdevelopmentgroup.com](https://www.zero.xyz/host/agents.daedalusdevelopmentgroup.com/llms.txt)