# trust-ring-key-image Compute the key image for the active identity in a specific election context. Use this to pre-check whether the active identity has already signed in an election without creating a full signature. The key image is deterministic: same key + same electionId always produces the same image. Agent View of the PolicyLayer registry record for `trust-ring-key-image`. HTML page: https://policylayer.com/tools/dev-forgesworn-bray/trust-ring-key-image ## Facts - Tool: `trust-ring-key-image` - Server: Nostr Bray (`nostr-bray`) — https://policylayer.com/tools/dev-forgesworn-bray.md - Install: `npx -y nostr-bray` - Homepage: https://github.com/forgesworn/bray - Risk category: Read (Low risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Allowed ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "trust-ring-key-image", "arguments": {} } } ``` ## Why trust-ring-key-image is rated Low This is a cryptographic computation that retrieves or derives information about the current state of an identity's participation in an election context. It has no side effects, does not execute arbitrary code or commands, does not modify any data, and does not involve financial transactions. The function is read-only verification/checking, making it clearly a Read category tool. From the tool's own definition: "Tool computes and returns a key image for pre-checking purposes without modifying any data. Description states it's used to 'pre-check whether the active identity has already signed' and 'produces the same image' deterministically—purely informational/query…" ## Use case AI agents call trust-ring-key-image to retrieve information from Nostr Bray without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere. ## Recommended policy (PolicyLayer) Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Nostr Bray: ```json { "version": "1", "default": "deny", "tools": { "trust-ring-key-image": {} } } ``` ## Other tools on Nostr Bray (239) - `blossom-delete` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/blossom-delete.md - `group-remove-user` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/group-remove-user.md - `label-remove` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/label-remove.md - `marketplace-credentials-clear` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/marketplace-credentials-clear.md - `marketplace-retire` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/marketplace-retire.md - `social-delete` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/social-delete.md - `tombstone` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/tombstone.md - `trust-revoke` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/trust-revoke.md - `vault-revoke` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/vault-revoke.md - `zap-wallet-clear` — Destructive — https://policylayer.com/tools/dev-forgesworn-bray/zap-wallet-clear.md - `cast-spell` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/cast-spell.md - `execute-action` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/execute-action.md - `identity-restore-shamir` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/identity-restore-shamir.md - `identity-switch` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/identity-switch.md - `marketplace-probe` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/marketplace-probe.md - `nip44-encrypt` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/nip44-encrypt.md - `onboard-verified` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/onboard-verified.md - `relay-auth` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/relay-auth.md - `trust-attest-chain` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/trust-attest-chain.md - `trust-ring-lsag-sign` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/trust-ring-lsag-sign.md - `trust-ring-prove` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/trust-ring-prove.md - `trust-spoken-verify` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/trust-spoken-verify.md - `vault-encrypt` — Execute — https://policylayer.com/tools/dev-forgesworn-bray/vault-encrypt.md - `marketplace-pay` — Financial — https://policylayer.com/tools/dev-forgesworn-bray/marketplace-pay.md - `zap-make-invoice` — Financial — https://policylayer.com/tools/dev-forgesworn-bray/zap-make-invoice.md - `zap-send` — Financial — https://policylayer.com/tools/dev-forgesworn-bray/zap-send.md - `article-list` — Read — https://policylayer.com/tools/dev-forgesworn-bray/article-list.md - `article-read` — Read — https://policylayer.com/tools/dev-forgesworn-bray/article-read.md - `badge-list` — Read — https://policylayer.com/tools/dev-forgesworn-bray/badge-list.md - `blossom-check` — Read — https://policylayer.com/tools/dev-forgesworn-bray/blossom-check.md - …and 209 more: https://policylayer.com/tools/dev-forgesworn-bray.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dev-forgesworn-bray · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-forgesworn-bray