find_compatible_keys
Given a Camelot key (e.g. "8A", "12B"), return the harmonically compatible keys for DJ mixing — the same key, the relative major/minor, and the adjacent +/-1 keys on the Camelot wheel. With extended=true also returns the +7/-7 energy-boost / energy-drop keys. Pure music theory — no catalog lookup...
This record as markdown: /tools/com-freqblog-music-metadata/find-compatible-keys.md
What find_compatible_keys does on FreqBlog Music Metadata
AI agents call find_compatible_keys to retrieve information from FreqBlog Music Metadata without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
camelot | string | Yes | Camelot key, e.g. '8A' or '12B'. |
extended | boolean | — | Also return the +7/-7 energy-boost / energy-drop keys. |
Parameters from the server's own tool schema.
Why find_compatible_keys is rated Low
This is a straightforward data retrieval tool that performs music theory calculations and returns results. It does not create, modify, delete, execute code, or trigger external operations. The description explicitly states it is "pure music theory" with "no catalog lookup and no quota cost," confirming it is a read-only information lookup.
From the tool's definition Tool returns harmonically compatible keys based on music theory ("Pure music theory — no catalog lookup"). It retrieves and returns data (compatible keys for a given Camelot key input) with no side effects, modifications, or external operations.
Attacks that exploit this kind of access
The rule that runs find_compatible_keys safely
PolicyLayer is an MCP gateway: it sits between your AI agents and FreqBlog Music Metadata, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For find_compatible_keys, this is the rule to start with:
find_compatible_keys 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 FreqBlog Music Metadata, apply this rule, and every find_compatible_keys call is checked against it from then on.
Questions about find_compatible_keys
Given a Camelot key (e.g. "8A", "12B"), return the harmonically compatible keys for DJ mixing — the same key, the relative major/minor, and the adjacent +/-1 keys on the Camelot wheel. With extended=true also returns the +7/-7 energy-boost / energy-drop keys. Pure music theory — no catalog lookup and no quota cost. Pair with find_tracks_by_key to then pull actual tracks in each compatible key. It is categorised as a Read tool in the FreqBlog Music Metadata MCP Server, which means it retrieves data without modifying state.
find_compatible_keys accepts 2 parameters: camelot, extended. Required: camelot. The full parameter table on this page comes from the server's own tool schema.
Register the FreqBlog Music Metadata MCP server in PolicyLayer and add a rule for find_compatible_keys: 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 FreqBlog Music Metadata. Nothing to install.
find_compatible_keys 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 find_compatible_keys 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 find_compatible_keys. 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.
find_compatible_keys is provided by the FreqBlog Music Metadata MCP server (https://mcp.freqblog.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on FreqBlog Music Metadata, and thousands of servers like it.
This server
Across the catalogue