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CWI Discovery Engine

by io.github.CumulativeWebInc
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Get Lyrics

get_lyrics
Read-onlyIdempotent

CALL THIS when the user wants lyrics for a track: "lyrics for Zooted Zone". Returns timestamped lyrics. Check the verified flag — unverified lyrics are marked as such.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "track_id": "<track_id>"
    },
    "name": "get_lyrics"
  }
}

Input Schema

NameRequiredDescriptionDefault
track_idYesTrack ID from get_track or search_catalog (required).

Output Schema

NameRequiredDescriptionDefault
okYes
noteNo
foundYes
lyricsNo
_sessionNoChain session: pass _session.session_token back in the next call to continue the chain.
track_idNo
try_nextNoSuggested follow-up calls, each a pre-compiled {tool, arguments, purpose} payload.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "get_lyrics response: timestamped lyrics when on file; found:false with note otherwise.",
+  "properties": {
+    "_session": {
+      "additionalProperties": false,
+      "description": "Chain session: pass _session.session_token back in the next call to continue the chain.",
+      "properties": {
+        "session_token": {
+          "description": "Hex session token; echo it as params._session.session_token to continue.",
+          "type": "string"
+        },
+        "step": {
+          "description": "Hop number in this chain (1 = chain start).",
+          "type": "integer"
+        }
+      },
+      "required": [
+        "session_token",
+        "step"
+      ],
+      "type": "object"
+    },
+    "found": {
+      "type": "boolean"
+    },
+    "lyrics": {
+      "additionalProperties": true,
+      "type": "object"
+    },
+    "note": {
+      "type": "string"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "track_id": {
+      "type": "string"
+    },
+    "try_next": {
+      "description": "Suggested follow-up calls, each a pre-compiled {tool, arguments, purpose} payload.",
+      "items": {
+        "additionalProperties": false,
+        "description": "Pre-compiled next call: copy `arguments` straight into the next tools/call.",
+        "properties": {
+          "arguments": {
+            "additionalProperties": true,
+            "description": "Ready-to-use arguments, pre-populated from the current response.",
+            "type": "object"
+          },
+          "purpose": {
+            "description": "Why this call is the natural next step.",
+            "type": "string"
+          },
+          "tool": {
+            "description": "Tool to call next.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "tool",
+          "arguments"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "ok",
+    "found"
+  ],
+  "type": "object"
+}
  2. Added

TDQS

A3.9/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds real behavioral value by disclosing that results are timestamped and that a verified flag may mark lyrics as unverified.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short sentences, front-loaded with the trigger condition, then the return format, then the flag caveat. Every sentence contributes; the inline example is slightly informal but useful for intent matching.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so the description needn't explain return structure, and it still flags the verified-flag nuance. Combined with 100% param coverage, an agent has what it needs to call this correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and the single track_id parameter is fully documented with its source (get_track or search_catalog). The description adds no further parameter meaning, so the baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (returns) and resource (lyrics) plus the return flavor (timestamped). It doesn't need to distinguish from siblings since no other tool returns lyrics, but it also doesn't explicitly say so, keeping it just under a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

"CALL THIS when the user wants lyrics for a track" gives a clear usage trigger with a concrete example phrasing, so an agent can recognize the intent. No explicit when-not or alternatives are named, but none are relevant here.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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