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scene_write

Write FX scene source

Create or replace a complete programmable effect, not a fixed-template parameter preset. Supply an ES module exporting scene with id, mount(ctx), reset(ctx), frame(ctx), and optional dispose(ctx). mount appends under ctx.layer and returns refs including root. HTML/CSS, SVG, Canvas and WebGL are supported; ctx.elapsedMs is the authored clock. No ambient application, network or provider authority is available. New scenes use expected_revision:0. Before replacing an existing scene, read it and supply both its revision and sha256; a stale edit refuses without overwriting. Saved source versions are retained. Use scene_preview to inspect actual pixels and iterate; saving source does not apply an opener/outro or change any Episode. Omit project_id for your account library, or supply an accessible Project for its account scope. See bitterclip://docs/identity-scene-authoring for the runtime contract.

Surface: Default model and app

Product release 1dce717408a55fac1047e7d779177fa3ef8ede51
Public contract commit 1ce47f7857ae3d9b6933fe83d5c33de3ae5efc64
Public contract SHA-256 241d47d25e4b4c1dae9d2263793874d06fc4ba7bc3c78d4cf2bc63fbb32ed7dc
Captured 2026-09-24T16:39:30.100Z. Review or improve this contract on GitHub.

These blocks show the complete MCP descriptors captured from serving Rails. Security schemes and resource URIs can differ by connected host.

Default model descriptor

{
  "name": "scene_write",
  "title": "Write FX scene source",
  "description": "Create or replace a complete programmable effect, not a fixed-template parameter preset. Supply an ES module exporting scene with id, mount(ctx), reset(ctx), frame(ctx), and optional dispose(ctx). mount appends under ctx.layer and returns refs including root. HTML/CSS, SVG, Canvas and WebGL are supported; ctx.elapsedMs is the authored clock. No ambient application, network or provider authority is available. New scenes use expected_revision:0. Before replacing an existing scene, read it and supply both its revision and sha256; a stale edit refuses without overwriting. Saved source versions are retained. Use scene_preview to inspect actual pixels and iterate; saving source does not apply an opener/outro or change any Episode. Omit project_id for your account library, or supply an accessible Project for its account scope. See bitterclip://docs/identity-scene-authoring for the runtime contract.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "project_id": {
        "type": "string",
        "description": "Optional Project scope; omitted means your own account."
      },
      "scene_id": {
        "type": "string",
        "description": "Stable account scene identifier, lowercase letters/numbers/hyphens."
      },
      "name": {
        "type": "string",
        "maxLength": 120
      },
      "source": {
        "type": "string",
        "maxLength": 131072,
        "description": "Complete ES module source, up to 128 KiB."
      },
      "expected_revision": {
        "type": "integer",
        "minimum": 0,
        "description": "0 for creation; current scene revision for an existing scene."
      },
      "expected_sha256": {
        "type": "string",
        "pattern": "^[a-f0-9]{64}$",
        "description": "Required for changes to existing scenes; sha256 from scene_read."
      },
      "settings": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "duration_ms": {
            "type": "integer",
            "minimum": 100,
            "maximum": 60000
          },
          "fps": {
            "type": "integer",
            "enum": [
              24,
              30,
              60
            ]
          },
          "aspect": {
            "type": "string",
            "enum": [
              "1:1",
              "16:9",
              "9:16",
              "4:5"
            ]
          },
          "asset_ids": {
            "type": "array",
            "maxItems": 16,
            "uniqueItems": true,
            "items": {
              "type": "string"
            },
            "description": "Explicit account image/texture asset IDs from identity_asset_ingest; the runtime receives only these admitted bytes."
          }
        }
      }
    },
    "required": [
      "scene_id",
      "source",
      "expected_revision"
    ],
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false,
    "openWorldHint": false
  },
  "securitySchemes": [
    {
      "type": "noauth"
    }
  ],
  "_meta": {
    "securitySchemes": [
      {
        "type": "noauth"
      }
    ],
    "ui": {
      "visibility": [
        "model",
        "app"
      ]
    },
    "openai/widgetAccessible": true
  }
}

App descriptor

{
  "name": "scene_write",
  "title": "Write FX scene source",
  "description": "Create or replace a complete programmable effect, not a fixed-template parameter preset. Supply an ES module exporting scene with id, mount(ctx), reset(ctx), frame(ctx), and optional dispose(ctx). mount appends under ctx.layer and returns refs including root. HTML/CSS, SVG, Canvas and WebGL are supported; ctx.elapsedMs is the authored clock. No ambient application, network or provider authority is available. New scenes use expected_revision:0. Before replacing an existing scene, read it and supply both its revision and sha256; a stale edit refuses without overwriting. Saved source versions are retained. Use scene_preview to inspect actual pixels and iterate; saving source does not apply an opener/outro or change any Episode. Omit project_id for your account library, or supply an accessible Project for its account scope. See bitterclip://docs/identity-scene-authoring for the runtime contract.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "project_id": {
        "type": "string",
        "description": "Optional Project scope; omitted means your own account."
      },
      "scene_id": {
        "type": "string",
        "description": "Stable account scene identifier, lowercase letters/numbers/hyphens."
      },
      "name": {
        "type": "string",
        "maxLength": 120
      },
      "source": {
        "type": "string",
        "maxLength": 131072,
        "description": "Complete ES module source, up to 128 KiB."
      },
      "expected_revision": {
        "type": "integer",
        "minimum": 0,
        "description": "0 for creation; current scene revision for an existing scene."
      },
      "expected_sha256": {
        "type": "string",
        "pattern": "^[a-f0-9]{64}$",
        "description": "Required for changes to existing scenes; sha256 from scene_read."
      },
      "settings": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "duration_ms": {
            "type": "integer",
            "minimum": 100,
            "maximum": 60000
          },
          "fps": {
            "type": "integer",
            "enum": [
              24,
              30,
              60
            ]
          },
          "aspect": {
            "type": "string",
            "enum": [
              "1:1",
              "16:9",
              "9:16",
              "4:5"
            ]
          },
          "asset_ids": {
            "type": "array",
            "maxItems": 16,
            "uniqueItems": true,
            "items": {
              "type": "string"
            },
            "description": "Explicit account image/texture asset IDs from identity_asset_ingest; the runtime receives only these admitted bytes."
          }
        }
      }
    },
    "required": [
      "scene_id",
      "source",
      "expected_revision"
    ],
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false,
    "openWorldHint": false
  },
  "securitySchemes": [
    {
      "type": "noauth"
    }
  ],
  "_meta": {
    "securitySchemes": [
      {
        "type": "noauth"
      }
    ],
    "ui": {
      "visibility": [
        "model",
        "app"
      ]
    },
    "openai/widgetAccessible": true
  },
  "outputSchema": {
    "type": "object",
    "properties": {
      "scene": {
        "type": "object"
      },
      "warnings": {
        "type": "array",
        "items": {
          "type": "object"
        }
      }
    },
    "required": [],
    "additionalProperties": false
  }
}

Live Workspace descriptor

{
  "name": "scene_write",
  "title": "Write FX scene source",
  "description": "Create or replace a complete programmable effect, not a fixed-template parameter preset. Supply an ES module exporting scene with id, mount(ctx), reset(ctx), frame(ctx), and optional dispose(ctx). mount appends under ctx.layer and returns refs including root. HTML/CSS, SVG, Canvas and WebGL are supported; ctx.elapsedMs is the authored clock. No ambient application, network or provider authority is available. New scenes use expected_revision:0. Before replacing an existing scene, read it and supply both its revision and sha256; a stale edit refuses without overwriting. Saved source versions are retained. Use scene_preview to inspect actual pixels and iterate; saving source does not apply an opener/outro or change any Episode. Omit project_id for your account library, or supply an accessible Project for its account scope. See bitterclip://docs/identity-scene-authoring for the runtime contract.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "project_id": {
        "type": "string",
        "description": "Optional Project scope; omitted means your own account."
      },
      "scene_id": {
        "type": "string",
        "description": "Stable account scene identifier, lowercase letters/numbers/hyphens."
      },
      "name": {
        "type": "string",
        "maxLength": 120
      },
      "source": {
        "type": "string",
        "maxLength": 131072,
        "description": "Complete ES module source, up to 128 KiB."
      },
      "expected_revision": {
        "type": "integer",
        "minimum": 0,
        "description": "0 for creation; current scene revision for an existing scene."
      },
      "expected_sha256": {
        "type": "string",
        "pattern": "^[a-f0-9]{64}$",
        "description": "Required for changes to existing scenes; sha256 from scene_read."
      },
      "settings": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "duration_ms": {
            "type": "integer",
            "minimum": 100,
            "maximum": 60000
          },
          "fps": {
            "type": "integer",
            "enum": [
              24,
              30,
              60
            ]
          },
          "aspect": {
            "type": "string",
            "enum": [
              "1:1",
              "16:9",
              "9:16",
              "4:5"
            ]
          },
          "asset_ids": {
            "type": "array",
            "maxItems": 16,
            "uniqueItems": true,
            "items": {
              "type": "string"
            },
            "description": "Explicit account image/texture asset IDs from identity_asset_ingest; the runtime receives only these admitted bytes."
          }
        }
      }
    },
    "required": [
      "scene_id",
      "source",
      "expected_revision"
    ],
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false,
    "openWorldHint": false
  },
  "securitySchemes": [
    {
      "type": "noauth"
    }
  ],
  "_meta": {
    "securitySchemes": [
      {
        "type": "noauth"
      }
    ],
    "ui": {
      "visibility": [
        "model",
        "app"
      ]
    },
    "openai/widgetAccessible": true
  },
  "outputSchema": {
    "type": "object",
    "properties": {
      "scene": {
        "type": "object"
      },
      "warnings": {
        "type": "array",
        "items": {
          "type": "object"
        }
      }
    },
    "required": [],
    "additionalProperties": false
  }
}

Errors

[
  "project_not_found",
  "invalid_input",
  "revision_conflict"
]

Examples

[
  {
    "label": "Create a minimal scene",
    "input": {
      "scene_id": "light-study",
      "expected_revision": 0,
      "source": "export const scene = { id: 'light-study', mount(ctx) { const root = document.createElement('div'); root.textContent = 'Light'; ctx.layer.append(root); return { root }; }, reset() {}, frame(ctx) { ctx.refs.root.style.opacity = String(Math.min(1, ctx.elapsedMs / 1000)); } };"
    }
  }
]