spriteship

Create a project

create_project

FREE and SYNCHRONOUS (no jobId — do not poll). Creates the container everything else needs: characters and assets are created INSIDE a project, and the project's gameType is what decides how they are drawn and animated. Also seeds a starter level map, so the game preview has something real to render immediately. Call list_projects first — reuse an existing project rather than making a near-duplicate.

Input Schema

TableJSON Schema

Name	Required	Description
`name`	Yes	Project name shown in the dashboard.
`style`	No	Optional art-style id applied as the default for generations in this project.
`gameType`	Yes	REQUIRED and permanent for everything in the project. platformer = side view with gravity; topdown = 4/8-direction overhead-ish (Zelda-like); topdown_overhead = straight down; isometric = 2:1 diamond; point_and_click = straight-on adventure scenes. Ask the user if it is not obvious — it changes every prompt downstream.
`styleGuide`	No	Reviewed palette, rendering and typography. Saved as active revision 1 for future generations; font IDs must belong to the available catalog. Omit to create without a guide.
`description`	No	Optional project description. Feeds the prompt context for later generations.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 13, 2026

addedInput schema / properties / styleGuide

Added value: +{
+  "additionalProperties": false,
+  "description": "Reviewed palette, rendering and typography. Saved as active revision 1 for future generations; font IDs must belong to the available catalog. Omit to create without a guide.",
+  "properties": {
+    "bodyFont": {
+      "additionalProperties": false,
+      "properties": {
+        "color": {
+          "pattern": "^#[0-9a-fA-F]{6}$",
+          "type": "string"
+        },
+        "family": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "fontId": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "lineHeight": {
+          "maximum": 3,
+          "minimum": 1,
+          "type": "number"
+        },
+        "sha256": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        },
+        "size": {
+          "maximum": 160,
+          "minimum": 8,
+          "type": "number"
+        },
+        "version": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "weight": {
+          "maximum": 900,
+          "minimum": 100,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "family",
+        "fontId",
+        "weight",
+        "size",
+        "lineHeight",
+        "color"
+      ],
+      "type": "object"
+    },
+    "camera": {
+      "enum": [
+        "platformer",
+        "topdown",
+        "topdown_overhead",
+        "isometric",
+        "point_and_click"
+      ],
+      "type": "string"
+    },
+    "direction": {
+      "maxLength": 2000,
+      "type": "string"
+    },
+    "headingFont": {
+      "additionalProperties": false,
+      "properties": {
+        "color": {
+          "pattern": "^#[0-9a-fA-F]{6}$",
+          "type": "string"
+        },
+        "family": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "fontId": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "lineHeight": {
+          "maximum": 3,
+          "minimum": 1,
+          "type": "number"
+        },
+        "sha256": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        },
+        "size": {
+          "maximum": 160,
+          "minimum": 8,
+          "type": "number"
+        },
+        "version": {
+          "maxLength": 100,
+          "minLength": 1,
+          "type": "string"
+        },
+        "weight": {
+          "maximum": 900,
+          "minimum": 100,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "family",
+        "fontId",
+        "weight",
+        "size",
+        "lineHeight",
+        "color"
+      ],
+      "type": "object"
+    },
+    "lockedColors": {
+      "items": {
+        "pattern": "^#[0-9a-fA-F]{6}$",
+        "type": "string"
+      },
+      "maxItems": 24,
+      "type": "array"
+    },
+    "palette": {
+      "additionalProperties": {
+        "pattern": "^#[0-9a-fA-F]{6}$",
+        "type": "string"
+      },
+      "propertyNames": {
+        "pattern": "^[a-zA-Z][a-zA-Z0-9_-]{0,39}$"
+      },
+      "type": "object"
+    },
+    "references": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "key": {
+            "maxLength": 1500,
+            "minLength": 1,
+            "type": "string"
+          },
+          "target": {
+            "enum": [
+              "overall_style",
+              "ui",
+              "world_indicators",
+              "characters",
+              "backgrounds"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "key",
+          "target"
+        ],
+        "type": "object"
+      },
+      "maxItems": 12,
+      "type": "array"
+    },
+    "rendering": {
+      "maxLength": 500,
+      "type": "string"
+    },
+    "shapeLanguage": {
+      "maxLength": 500,
+      "type": "string"
+    },
+    "version": {
+      "const": 1,
+      "type": "number"
+    }
+  },
+  "required": [
+    "version",
+    "direction",
+    "palette",
+    "shapeLanguage",
+    "rendering",
+    "headingFont",
+    "bodyFont",
+    "camera",
+    "references",
+    "lockedColors"
+  ],
+  "type": "object"
+}

First observedAug 14, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Adds substantial context beyond the annotations: it is FREE, synchronous (no jobId, so don't poll), and as a side effect seeds a starter level map for immediate preview rendering. Annotations cover safety flags but say nothing about cost, sync-vs-async behavior, or side effects, so this disclosure is genuinely additive. Minor gap: no mention of permissions or the shape of the created object.

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 two highest-value facts (FREE, SYNCHRONOUS/don't poll) before explaining purpose and the list_projects prerequisite. Four sentences, all earning their place, though slightly dense.

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 create tool with no output schema, annotations present, and full schema coverage, the description covers purpose, cost, sync behavior, side effects and a prerequisite. The only omission is what the call returns (e.g. a project id to use downstream), which is a modest gap.

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 documents name, style, gameType, styleGuide and description in detail. The description adds only the downstream consequence of gameType ('decides how they are drawn and animated'), which the schema also conveys. Baseline 3 is appropriate when structured data carries the parameter burden.

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 ('Creates') and immediately characterizes the project as 'the container everything else needs', explaining its role relative to sibling create_asset/create_character. An agent can distinguish this from get_project/list_projects 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?

Gives explicit operating instructions: 'Call list_projects first — reuse an existing project rather than making a near-duplicate' and 'do not poll'. It names the alternative tool and the condition under which to prefer it, leaving nothing to inference.

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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