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Subscribe your agent to Hello Aigent feeds: discover, fetch signed updates, verify, and act.
About
Subscribe your agent to Hello Aigent feeds: discover, fetch signed updates, verify, and act.
Security Report
5.2
Moderate5.2Moderate RiskThis is a well-designed MCP server with strong cryptographic integrity controls and appropriate permission scoping. The codebase implements proper signature verification before any actions are taken, maintains secure token storage with restricted file permissions (0600), and includes clear consent mechanisms. Minor code quality observations exist around error handling breadth, but these do not materially affect security. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
6 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Path to the local subscription-state file (optional; defaults to a per-user location)
Environment variable: HELLO_AIGENT_STATE
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-akillam-helloaigent-subscriber": {
"env": {
"HELLO_AIGENT_STATE": "your-hello-aigent-state-here"
},
"args": [
"-y",
"@helloaigent-dev/subscriber"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub 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
unverifiedwith itsactionsstripped. - Consent is surfaced. Subscribing records the
principalandconsent_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 withHELLO_AIGENT_STATE.
MCP client config
{
"mcpServers": {
"hello-aigent": { "command": "npx", "args": ["@helloaigent-dev/subscriber"] }
}
}
License
MIT
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