Nostr Signer
https://signer.frontiercrown.com/mcp ↗
Description
Approve Nostr signatures with your own browser signer without exposing a private key.
What our measurements say
Nostr Signer is a remote MCP server published at signer.frontiercrown.com. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 656 ms, a delay an agent will notice. It exposes a broad tool surface of 17 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names are action-oriented and clearly indicate their purpose.
- Descriptions explicitly state use cases and constraints (e.g., 'Never accepts an nsec').
- Parameters include required/optional flags and clear types.
Weaknesses
- Some parameter names (e.g., 'intent_id') lack contextual explanation.
- Descriptions occasionally use technical jargon without broader context.
- Error handling and failure scenarios are not consistently documented.
begin_nostrconnect_pairing— Parameter 'relays' is optional but lacks clarification on default behavior.get_grynvault_account_dashboard— Description mentions 'short-lived signed authorization' but doesn't define risks of expiration.sign_event— 'intent_id' parameter name is clear but could benefit from a brief explanation of its purpose.
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 179ms → warm 179ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
get_setup_urlReturn the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.
get_signer_statusCheck whether a user-controlled NIP-07 or NIP-46 signer is connected.
begin_nostrconnect_pairingAdvanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.
relaysarray
connect_bunkerConnect a bunker:// URI only when the user knowingly supplied it. Prefer the local setup page so connection secrets are not placed in chat. Never accepts an nsec.
connection_uristringrequired
get_public_keyReturn the public key exposed by the currently paired signer.
prepare_notePrepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.
contentstringrequired
prepare_eventValidate and bind an exact unsigned Nostr event for user review. This does not sign or publish. Show the user every field before requesting a signature.
eventobjectrequired
sign_eventAsk the paired signer to approve and sign the exact event bound to a fresh intent. Requires explicit user intent and never publishes.
intent_idstringrequiredconfirm_signaturebooleanrequired
publish_eventPublish a previously verified signed event to configured relays. Requires separate explicit user intent.
intent_idstringrequiredconfirm_publishbooleanrequiredrelaysarray
query_eventsRead a bounded set of verified public profile or note events from selected relays.
relaysarrayauthorsarraykindsarraylimitintegersinceinteger
disconnect_signerForget the in-memory signer session and all prepared events.
confirm_disconnectbooleanrequired
get_grynvault_account_dashboardRead the connected Nostr identity's Grynvault supporter, payment, and NIP-05 dashboard using a short-lived signed authorization. This does not create an invoice or change settlement.
confirm_account_accessbooleanrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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