decode
Decode a nip19 entity (npub, nsec, note, nevent, nprofile, naddr) or nostr: URI to its components.
This record as markdown: /tools/dev-forgesworn-bray/decode.md
What decode does on Nostr Bray
AI agents call decode 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.
Why decode is rated Low
This is a pure parsing/decoding utility that transforms encoded data into readable components. It has no side effects—it neither modifies state, deletes data, executes commands, nor moves funds. The low severity reflects minimal risk even if an AI misuses it; worst case is incorrect interpretation of decoded values. High confidence due to clear, unambiguous description of a read-only operation.
From the tool's definition The tool 'decode' parses and extracts components from Nostr protocol entities (npub, nsec, note, nevent, nprofile, naddr) and URIs.
Attacks that exploit this kind of access
The rule that runs decode safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Nostr Bray, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For decode, this is the rule to start with:
decode is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every decode call is checked against it from then on.
Questions about decode
Decode a nip19 entity (npub, nsec, note, nevent, nprofile, naddr) or nostr: URI to its components. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for decode: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Nostr Bray. Nothing to install.
decode is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the decode rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for decode. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
decode is provided by the Nostr Bray MCP server (nostr-bray). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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