This server lets agents subscribe to Hello Aigent feeds, fetch verified updates, manage subscriptions, and collect updates into a digest.
Subscribe (hello_aigent_subscribe): Fetch a site's /.well-known/hello-aigent.json and subscribe on behalf of a principal with a defined consent scope (updates, offers, or transactional). Tokens are stored locally and never exposed.
Fetch & Verify Updates (hello_aigent_fetch): Pull new updates since the last cursor. Every envelope is Ed25519 signature-verified — verified updates are returned under updates, unverified ones under unverified with actions stripped.
Unsubscribe (hello_aigent_unsubscribe): Revoke consent for a subscription idempotently.
List Subscriptions (hello_aigent_list_subscriptions): View all stored subscriptions (active and revoked) including feed, principal, consent scope, and cursor — without exposing bearer tokens.
Check Sites & Auto-Subscribe: Check visited sites for Hello Aigent feeds and auto-subscribe based on a configurable standing policy (origin: auto).
Watch Mode: Poll active subscriptions at a configurable cadence (e.g., hourly, daily), verify signatures, and append new updates to a local digest file. Supports one-shot, long-running loop, or exec-on-update modes.
Access Digest: Retrieve unread digest entries collected by watch mode, marking them as surfaced once read.
Policy & Local State: Configure principal identity, auto-subscription behavior, watch cadence, allowed actions, and privacy settings via a local policy.json. All data is stored in ~/.hello-aigent/ with restricted permissions (0600).
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@hello-aigent-subscriber fetch new updates from my subscribed feeds"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
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. Plus watch mode: a standing poller that collects verified updates into a digest between agent runs.
npx @helloaigent-dev/subscriber # MCP server (stdio)
npx @helloaigent-dev/subscriber watch # standing watcher (default cadence: daily)Tool | What it does |
| Reads the site's |
| Pulls only-new-since updates via the stored cursor; verifies every envelope signature |
| Revokes consent (idempotent) — the one-call undo |
| Lists stored subscriptions (tokens are never exposed) |
| Checks a site you're visiting for a feed; auto-subscribes per your standing policy ( |
| Returns unread digest entries collected by |
| Emits ready-to-apply standing-schedule recipes (scheduled task, recurring task, cron) |
Related MCP server: Feedbagel MCP Server
npx @helloaigent-dev/subscriber watch --once # one pass (what schedulers call)
npx @helloaigent-dev/subscriber watch --every 6h # long-running loop (floor: hourly)
npx @helloaigent-dev/subscriber watch --once --exec "my-agent-cmd" # trigger a run on new updatesEach pass polls every active subscription, verifies signatures, and appends new updates to the
digest file. The server-side mailbox means a missed run loses nothing. --exec runs your command
when new updates land, with HELLO_AIGENT_NEW_UPDATES and HELLO_AIGENT_DIGEST set.
Written to ~/.hello-aigent/policy.json on first run — everything automatic by default, and this
file is where you change that:
Key | Default | Meaning |
|
| Your stable identity across all feeds — set it once (e.g. your email) |
|
| Subscribe when your agent visits a Hello Aigent site: |
|
| How often watch polls ( |
|
| What the agent may do unprompted: |
|
| Opt-in: per-site pseudonymous principals |
Feeds nobody reads decay: after 30 idle days watch stops polling them; after 60 it unsubscribes (noted in the digest). Reading the digest or fetching a feed keeps it alive.
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 standing policy. Subscribing records principal + consent_scope; your policy
file is the consent layer, and unsubscribe is always one idempotent call.
Local state only. Subscriptions (including bearer tokens), policy, and the digest live in
~/.hello-aigent/ (mode 0600). Override with HELLO_AIGENT_STATE / HELLO_AIGENT_POLICY /
HELLO_AIGENT_DIGEST.
{
"mcpServers": {
"hello-aigent": { "command": "npx", "args": ["@helloaigent-dev/subscriber"] }
}
}MIT
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