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by io.github.Blackwood-State
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Speech to text

blackwood_audio_transcribe
Read-onlyIdempotent

Use when you need speech to text transcription or translation of an audio file at a public URL. Do not use for audio over 10 MB or speaker labels. Returns JSON with a Whisper transcription of an audio file: text, timed segments and language, or an English translation for 0.005 USDC per megabyte, up to 0.05 USDC per call (clients without upto pay the cap). Result in the same call (about 20000 ms); a status tool polls for free if it takes longer. Category: Media.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesPublic http(s) URL of the audio file, e.g. https://example.com/talk.mp3 (mp3, wav, ogg, m4a, webm; up to 10 MB)
taskNotranscribe keeps the spoken language; translate returns English (transcribe when omitted)
languageNoISO 639-1 code of the spoken language, e.g. en or pt (detected when omitted)
response_formatNoconcise (the default when omitted) keeps the JSON short: long fields such as base64 images or audio come back as separate image/audio content blocks and other long strings are cut with a marker; detailed returns the full JSON

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "done": {
-        "type": "boolean"
-      },
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "message": {
-            "type": "string"
-          },
-          "name": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "name",
-          "message"
-        ],
-        "type": "object"
-      },
-      "jobId": {
-        "type": "string"
-      },
-      "output": {
-        "additionalProperties": false,
-        "properties": {
-          "bytes": {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          "durationSeconds": {
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "language": {
-            "type": [
-              "string",
-              "null"
-            ]
-          },
-          "segments": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "end": {
-                  "type": "number"
-                },
-                "start": {
-                  "type": "number"
-                },
-                "text": {
-                  "type": "string"
-                }
-              },
-              "required": [
-                "start",
-                "end",
-                "text"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "task": {
-            "enum": [
-              "transcribe",
-              "translate"
-            ],
-            "type": "string"
-          },
-          "text": {
-            "type": "string"
-          },
-          "url": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "url",
-          "task",
-          "language",
-          "durationSeconds",
-          "bytes",
-          "text",
-          "segments"
-        ],
-        "type": "object"
-      },
-      "pollUrl": {
-        "type": "string"
-      },
-      "status": {
-        "enum": [
-          "queued",
-          "running",
-          "paused",
-          "errored",
-          "terminated",
-          "complete",
-          "waiting",
-          "waitingForPause",
-          "rollingBack",
-          "unknown"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "jobId",
-      "status",
-      "done",
-      "pollUrl"
-    ],
-    "type": "object"
-  },
-  {
-    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
-    "properties": {
-      "accepts": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "error": {
-        "type": "string"
-      },
-      "extensions": {
-        "type": "object"
-      },
-      "resource": {
-        "type": "object"
-      },
-      "x402Version": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "x402Version",
-      "accepts"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "done": {
+        "type": "boolean"
+      },
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "message": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "message"
+        ],
+        "type": "object"
+      },
+      "jobId": {
+        "type": "string"
+      },
+      "next": {
+        "additionalProperties": false,
+        "description": "Suggested next paid call in the same family (call it in a loop when the task continues)",
+        "properties": {
+          "method": {
+            "enum": [
+              "GET",
+              "POST"
+            ],
+            "type": "string"
+          },
+          "sample": {
+            "description": "Free fixed sample of the whole family",
+            "type": "string"
+          },
+          "service": {
+            "description": "Service id of the suggested next paid call",
+            "type": "string"
+          },
+          "tool": {
+            "description": "MCP tool name of the same call",
+            "type": "string"
+          },
+          "url": {
+            "description": "Paid route of the next call",
+            "type": "string"
+          },
+          "useWhen": {
+            "description": "When the next call is the right one",
+            "type": "string"
+          }
+        },
+        "required": [
+          "service",
+          "tool",
+          "method",
+          "url",
+          "useWhen",
+          "sample"
+        ],
+        "type": "object"
+      },
+      "output": {
+        "additionalProperties": false,
+        "properties": {
+          "bytes": {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          "durationSeconds": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "language": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "segments": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "end": {
+                  "type": "number"
+                },
+                "start": {
+                  "type": "number"
+                },
+                "text": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "start",
+                "end",
+                "text"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "task": {
+            "enum": [
+              "transcribe",
+              "translate"
+            ],
+            "type": "string"
+          },
+          "text": {
+            "type": "string"
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "url",
+          "task",
+          "language",
+          "durationSeconds",
+          "bytes",
+          "text",
+          "segments"
+        ],
+        "type": "object"
+      },
+      "pollUrl": {
+        "type": "string"
+      },
+      "status": {
+        "enum": [
+          "queued",
+          "running",
+          "paused",
+          "errored",
+          "terminated",
+          "complete",
+          "waiting",
+          "waitingForPause",
+          "rollingBack",
+          "unknown"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "jobId",
+      "status",
+      "done",
+      "pollUrl"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
+    "properties": {
+      "accepts": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "error": {
+        "type": "string"
+      },
+      "extensions": {
+        "type": "object"
+      },
+      "resource": {
+        "type": "object"
+      },
+      "x402Version": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "x402Version",
+      "accepts"
+    ],
+    "type": "object"
+  }
+]
  2. Added

TDQS

A4.6/5.0
Behavior5/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), and the description goes well beyond them: per-megabyte pricing with a per-call cap, the 'clients without upto pay the cap' caveat, and an expected ~20000 ms synchronous latency with a free polling alternative. Cost and latency characteristics are exactly the behavior an agent needs before invoking a metered API.

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?

Front-loads the usage condition, then layers return shape, pricing, and timing in dense but non-redundant sentences. The trailing 'Category: Media.' is minor filler, but nothing else is wasted.

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

Completeness5/5

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

With an output schema present, the description need not detail return values, yet it still summarizes them (text, timed segments, language) alongside pricing and latency fallback. Nothing an agent needs to invoke this tool correctly is missing.

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 description coverage is 100%, so the schema already fully documents url, task, language and response_format. The description's mentions of 'translation' and language detection restate rather than extend the schema, so the baseline 3 is appropriate.

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

Purpose5/5

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

States a specific verb and resource ('speech to text transcription or translation of an audio file at a public URL') and scopes the input source precisely. An agent can immediately distinguish it from siblings like blackwood_speech_synthesize and blackwood_text_translate without opening any schema.

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

Usage Guidelines5/5

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

Explicit when-to-use ('when you need speech to text transcription or translation') plus explicit when-not ('Do not use for audio over 10 MB or speaker labels'). It also routes the agent to the async fallback, naming blackwood_audio_transcribe_status for jobs that exceed the inline wait.

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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