MCP Servers

hello-aigent-subscriber

Enables agents to subscribe to Hello Aigent feeds, fetch signed updates, verify them, and act on them.

Category

README

@helloaigent-dev/subscriber

The Hello Aigent reference subscriber — an MCP server that lets any agent subscribe to any Hello Aigent feed, fetch signed updates, verify them, and act on them.

npx @helloaigent-dev/subscriber

Tools

Tool	What it does
`hello_aigent_subscribe(discovery_url, feed_id?, principal, consent_scope)`	Reads the site's `/.well-known/hello-aigent.json`, subscribes on behalf of your principal
`hello_aigent_fetch(subscription_id?, max?)`	Pulls only-new-since updates via the stored cursor; verifies every envelope signature
`hello_aigent_unsubscribe(subscription_id)`	Revokes consent (idempotent)
`hello_aigent_list_subscriptions()`	Lists stored subscriptions (tokens are never exposed)

Guarantees

Signature verification before anything is actionable. Envelopes are Ed25519-verified (RFC 8785 JCS canonicalization) against the feed's discovery public key. Anything that fails verification is returned under unverified with its actions stripped.
Consent is surfaced. Subscribing records the principal and consent_scope; the tool description instructs agents to confirm with their principal first.
Local state only. Subscriptions (including bearer tokens) live in ~/.hello-aigent/subscriptions.json (mode 0600). Override with HELLO_AIGENT_STATE.

MCP client config

{
  "mcpServers": {
    "hello-aigent": { "command": "npx", "args": ["@helloaigent-dev/subscriber"] }
  }
}

License

MIT

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