get_audio_features_batch
Get audio features for MANY tracks in one call (up to 50 processed) — ideal for analysing a whole playlist at once. Identify each item by name (track/artist), by isrc (matched exactly first — best for CJK / K-pop / niche tracks whose fuzzy name-match misses), or both (ISRC first, name as the fall...
This record as markdown: /tools/com-freqblog-music-metadata/get-audio-features-batch.md
What get_audio_features_batch does on FreqBlog Music Metadata
AI agents call get_audio_features_batch 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 |
|---|---|---|---|
tracks | array | Yes | List of {track?, artist?, isrc?} objects. Up to 50 are processed per call; any extra (up to 200 accepted) come back skipped. Each item should carry `track` or ` |
Parameters from the server's own tool schema.
Why get_audio_features_batch is rated Low
This tool queries and retrieves metadata about music tracks without modifying, deleting, or executing operations. It processes up to 50 items in a single call and returns feature data. The response handling for invalid/over-limit entries confirms read-only behavior with no side effects. Batch retrieval does not elevate the severity beyond the baseline read operation.
From the tool's definition Tool retrieves audio features (BPM, key, mood, genre) for tracks in batch; described as 'Get audio features for MANY tracks' with identification by name or ISRC. No modification, deletion, or execution capabilities mentioned.
Attacks that exploit this kind of access
The rule that runs get_audio_features_batch 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 get_audio_features_batch, this is the rule to start with:
get_audio_features_batch 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 get_audio_features_batch call is checked against it from then on.
Questions about get_audio_features_batch
Get audio features for MANY tracks in one call (up to 50 processed) — ideal for analysing a whole playlist at once. Identify each item by name (track/artist), by isrc (matched exactly first — best for CJK / K-pop / niche tracks whose fuzzy name-match misses), or both (ISRC first, name as the fallback). One bad entry never fails the batch. Items beyond the 50-per-call cap come back with found: false and backfill_status: "over_limit"; an item missing BOTH track and isrc comes back "invalid_no_query". Neither is processed or charged — the response's skipped field counts them, so split a long list into calls of <=50 and resubmit any skipped rows. Returns counts (found / not_found / skipped) plus a per-track results array, where each entry's result is the same feature object as get_audio_features (or null when not found), and isrc is echoed back. An item is billed only when it returns features or queues an on-demand ingest; an ISRC/name with no match anywhere is free. For a single track, use get_audio_features. It is categorised as a Read tool in the FreqBlog Music Metadata MCP Server, which means it retrieves data without modifying state.
get_audio_features_batch accepts 1 parameter: tracks. Required: tracks. 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 get_audio_features_batch: 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.
get_audio_features_batch 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 get_audio_features_batch 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 get_audio_features_batch. 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.
get_audio_features_batch 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.
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