Tomorrow Lives Engines

Sound list

sound_list

Read-onlyIdempotent

The twenty-one sounds (steps on twelve surfaces, doors and stairs, blows, thunder, splashes, a siren, animal calls, notes and the rest) with what each of a, b and c does, and the seven beds an ambience is mixed from. Costs no units.

Input Schema

Name	Required	Description	Default
No arguments

Output Schema

Name	Required	Description
`ms`	No	Milliseconds the run took.
`job`	Yes	The job id; the job tool reads it.
`verb`	No	The tool that made it.
`files`	No	Files made, each with a name, type, size and a signed URL.
`units`	No	Units this call cost.
`result`	No	The engine's own answer, a JSON document.
`status`	No	queued when the job runs in the background.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 14, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": true,
+  "properties": {
+    "files": {
+      "description": "Files made, each with a name, type, size and a signed URL.",
+      "items": {
+        "additionalProperties": {},
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "job": {
+      "description": "The job id; the job tool reads it.",
+      "type": "string"
+    },
+    "ms": {
+      "description": "Milliseconds the run took.",
+      "type": "number"
+    },
+    "result": {
+      "description": "The engine's own answer, a JSON document."
+    },
+    "status": {
+      "description": "queued when the job runs in the background.",
+      "type": "string"
+    },
+    "units": {
+      "description": "Units this call cost.",
+      "type": "number"
+    },
+    "verb": {
+      "description": "The tool that made it.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "job"
+  ],
+  "type": "object"
+}

First observedOct 14, 2026

TDQS

B3.3/5.0

Behavior4/5

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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, and an output schema covers the return payload, so the burden is low. Within that, 'Costs no units' is a genuinely additive cost/resource trait not present in the structured fields.

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

Conciseness3/5

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

A single sentence front-loads the counts of sounds and beds, which is reasonable, but the long parenthetical inventory ('steps on twelve surfaces, doors and stairs, blows, thunder, splashes, a siren, animal calls, notes and the rest') is verbose and trails off with filler like 'and the rest'.

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?

For a parameterless catalogue tool with an output schema describing return values and annotations covering the safety profile, the description is nearly sufficient. The main gap is the missing pointer to sound_effect for consumption and the unexplained a/b/c reference.

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

Parameters4/5

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

The tool takes zero parameters, so per the baseline no parameter explanation is required. The stray mention of 'what each of a, b and c does' refers to something outside this schema and adds confusion rather than clarity, but does not penalize an empty parameter set.

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

Purpose3/5

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

The description names the resource (twenty-one sounds plus seven beds) but is a fragment with no action verb, and the cryptic 'what each of a, b and c does' is never explained. It does not mention or contrast with the obvious sibling sound_effect, so an agent gets the inventory but not a crisp statement of what calling this tool does.

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

Usage Guidelines2/5

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

There is no when-to-use or when-not-to-use guidance and no reference to alternatives such as sound_effect for actually playing a sound. The only practical cue is 'Costs no units', which implies it is cheap to call but does not route the agent between tools.

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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