Tomorrow Lives Engines

Price a material bake

material_cost

Read-onlyIdempotent

What baking a material document costs at res pixels square (default 256): operations and bytes. Costs no units.

Input Schema

Name	Required	Description	Default
`res`	No	Bake resolution in pixels square to price (default 256).
`material`	Yes	The material document, written inline as JSON.

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.

Changed3 schema fields changedOct 14, 2026

addedInput schema / properties / material / description

Added value: +"The material document, written inline as JSON."

addedInput schema / properties / res / description

Added value: +"Bake resolution in pixels square to price (default 256)."

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

A3.7/5.0

Behavior4/5

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

Annotations already declare readOnly, idempotent, and non-destructive. The description adds information the annotations do not carry: that the call consumes no credits ('Costs no units'), which is a genuine billing/side-effect clarification beyond the structured safety hints.

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?

A single compact sentence front-loads the cost question and then the return units. The trailing 'Costs no units.' is terse but earns its place by clarifying billing, so the structure is efficient without waste.

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 need not document the returned operations/bytes structure. Combined with 100% schema coverage for inputs, the only real gap is the absence of an explicit pointer to material_bake as the follow-up action.

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% and both parameters are already documented there, including the res default of 256. The description repeats the res default but adds no syntax, format, or constraint detail beyond the schema, so the baseline 3 applies.

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?

The description names a specific verb+resource ('what baking a material document costs') and states the return shape ('operations and bytes'). It distinguishes itself implicitly from the sibling material_bake by being a pricing query rather than the bake itself, though it never names that sibling explicitly.

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

Usage Guidelines3/5

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

Usage is only implied: an agent can infer this is a pre-flight estimate for material_bake, but the description never says when to call it instead of material_bake or material_check. No prerequisites or exclusions are given.

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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