{ "openapi": "3.1.1", "info": { "title": "Xsheet to Drawing Project API", "version": "1.0.0", "summary": "Compile reference-based layer timing into an editable Flipline drawing project.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://fliplinexsheetcompiler.usefulweb.app" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Compile reference-based layer timing into an editable Flipline drawing project.", "description": "Paste an Xsheet project containing source drawings and independent layer exposures. Merge matching composite ticks, split long holds and download a standard Flipline drawing project. References remain editable in the original Xsheet file; compiled drawings are independent snapshots.\n\nMethodology:\n- Parse the flipline-xsheet version 1 format, including a valid Flipline drawing project, equal-length exposure columns and references from zero to the source drawing count. Each source layer has exactly one column.\n- Merge adjacent identical reference tuples. Split composite holds into chunks of at most ten ticks. Reject more than 24 resulting drawing frames instead of truncating timing.\n- Copy each referenced source cel into the resulting drawing frame. Zero becomes an empty cel. Preserve layer order, visibility, locks, opacity, paper, canvas settings, brushes, pressure, image sources and mark transforms. The source project and exposure cells are not mutated.\n- The fully expanded result must also fit the drawing-board budgets of 2000 marks, 50000 points, 240000 brush dabs and 8 million embedded source characters. Repeated image sources count each time as in ordinary Flipline projects. Input text is limited to 1 million characters; the browser Xsheet workspace accepts larger local project files up to 16 MB.", "tags": [ "apps" ], "x-mcp-tool": "flipline_xsheet_compiler", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/FliplineXsheetCompilerInput" }, "examples": { "example1": { "summary": "Compile the original paper-bird timing study", "value": { "project": "{\"format\":\"flipline-xsheet\",\"version\":1,\"name\":\"Paper bird\",\"fps\":12,\"source\":{\"format\":\"flipline\",\"version\":1,\"name\":\"Paper bird\",\"width\":960,\"height\":540,\"fps\":12,\"background\":\"#FFFAF0\",\"transparent\":false,\"paper\":\"plain\",\"frames\":[{\"id\":\"drawing-1\",\"hold\":2,\"label\":\"\"},{\"id\":\"drawing-2\",\"hold\":2,\"label\":\"\"},{\"id\":\"drawing-3\",\"hold\":2,\"label\":\"\"},{\"id\":\"drawing-4\",\"hold\":2,\"label\":\"\"}],\"layers\":[{\"id\":\"action\",\"name\":\"Bird\",\"visible\":true,\"locked\":false,\"opacity\":1,\"cels\":[[{\"id\":\"tail\",\"kind\":\"pen\",\"color\":\"#304F57\",\"size\":10,\"fill\":false,\"points\":[[0.39,0.53],[0.28,0.48],[0.32,0.58]]},{\"id\":\"body\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.37,0.43],[0.59,0.59]]},{\"id\":\"head\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.55,0.39],[0.66,0.5]]},{\"id\":\"beak\",\"kind\":\"pen\",\"color\":\"#D8AB5B\",\"size\":7,\"fill\":false,\"points\":[[0.655,0.43],[0.7,0.45],[0.65,0.47]]},{\"id\":\"eye\",\"kind\":\"ellipse\",\"color\":\"#FFFAF0\",\"size\":3,\"fill\":true,\"points\":[[0.62,0.418],[0.631,0.432]]},{\"id\":\"wing\",\"kind\":\"pen\",\"color\":\"#B66645\",\"size\":24,\"fill\":false,\"points\":[[0.47,0.49],[0.38,0.24]]},{\"id\":\"fold\",\"kind\":\"pen\",\"color\":\"#E7BC82\",\"size\":5,\"fill\":false,\"points\":[[0.47,0.49],[0.42,0.27999999999999997]]}],[{\"id\":\"tail\",\"kind\":\"pen\",\"color\":\"#304F57\",\"size\":10,\"fill\":false,\"points\":[[0.39,0.53],[0.28,0.48],[0.32,0.58]]},{\"id\":\"body\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.37,0.43],[0.59,0.59]]},{\"id\":\"head\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.55,0.39],[0.66,0.5]]},{\"id\":\"beak\",\"kind\":\"pen\",\"color\":\"#D8AB5B\",\"size\":7,\"fill\":false,\"points\":[[0.655,0.43],[0.7,0.45],[0.65,0.47]]},{\"id\":\"eye\",\"kind\":\"ellipse\",\"color\":\"#FFFAF0\",\"size\":3,\"fill\":true,\"points\":[[0.62,0.418],[0.631,0.432]]},{\"id\":\"wing\",\"kind\":\"pen\",\"color\":\"#B66645\",\"size\":24,\"fill\":false,\"points\":[[0.47,0.49],[0.32,0.42]]},{\"id\":\"fold\",\"kind\":\"pen\",\"color\":\"#E7BC82\",\"size\":5,\"fill\":false,\"points\":[[0.47,0.49],[0.36,0.45999999999999996]]}],[{\"id\":\"tail\",\"kind\":\"pen\",\"color\":\"#304F57\",\"size\":10,\"fill\":false,\"points\":[[0.39,0.53],[0.28,0.48],[0.32,0.58]]},{\"id\":\"body\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.37,0.43],[0.59,0.59]]},{\"id\":\"head\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.55,0.39],[0.66,0.5]]},{\"id\":\"beak\",\"kind\":\"pen\",\"color\":\"#D8AB5B\",\"size\":7,\"fill\":false,\"points\":[[0.655,0.43],[0.7,0.45],[0.65,0.47]]},{\"id\":\"eye\",\"kind\":\"ellipse\",\"color\":\"#FFFAF0\",\"size\":3,\"fill\":true,\"points\":[[0.62,0.418],[0.631,0.432]]},{\"id\":\"wing\",\"kind\":\"pen\",\"color\":\"#B66645\",\"size\":24,\"fill\":false,\"points\":[[0.47,0.49],[0.4,0.72]]},{\"id\":\"fold\",\"kind\":\"pen\",\"color\":\"#E7BC82\",\"size\":5,\"fill\":false,\"points\":[[0.47,0.49],[0.44,0.76]]}],[{\"id\":\"tail\",\"kind\":\"pen\",\"color\":\"#304F57\",\"size\":10,\"fill\":false,\"points\":[[0.39,0.53],[0.28,0.48],[0.32,0.58]]},{\"id\":\"body\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.37,0.43],[0.59,0.59]]},{\"id\":\"head\",\"kind\":\"ellipse\",\"color\":\"#304F57\",\"size\":3,\"fill\":true,\"points\":[[0.55,0.39],[0.66,0.5]]},{\"id\":\"beak\",\"kind\":\"pen\",\"color\":\"#D8AB5B\",\"size\":7,\"fill\":false,\"points\":[[0.655,0.43],[0.7,0.45],[0.65,0.47]]},{\"id\":\"eye\",\"kind\":\"ellipse\",\"color\":\"#FFFAF0\",\"size\":3,\"fill\":true,\"points\":[[0.62,0.418],[0.631,0.432]]},{\"id\":\"wing\",\"kind\":\"pen\",\"color\":\"#B66645\",\"size\":24,\"fill\":false,\"points\":[[0.47,0.49],[0.52,0.28]]},{\"id\":\"fold\",\"kind\":\"pen\",\"color\":\"#E7BC82\",\"size\":5,\"fill\":false,\"points\":[[0.47,0.49],[0.56,0.32]]}]]},{\"id\":\"atmosphere\",\"name\":\"Clouds\",\"visible\":true,\"locked\":false,\"opacity\":1,\"cels\":[[{\"id\":\"cloud-a\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.12,0.18],[0.28,0.24]]},{\"id\":\"cloud-b\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.16999999999999998,0.15],[0.25,0.25]]},{\"id\":\"cloud-c\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.74,0.3],[0.89,0.345]]}],[{\"id\":\"cloud-a\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.145,0.18],[0.305,0.24]]},{\"id\":\"cloud-b\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.195,0.15],[0.275,0.25]]},{\"id\":\"cloud-c\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.72,0.3],[0.87,0.345]]}],[{\"id\":\"cloud-a\",\"kind\":\"ellipse\",\"color\":\"#D8E2D9\",\"size\":3,\"fill\":true,\"points\":[[0.16999999999999998,0.18],[0.32999999999999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} } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/FliplineXsheetCompilerResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "FliplineXsheetCompilerInput": { "type": "object", "additionalProperties": false, "properties": { "project": { "title": "Xsheet project JSON (up to 1 million characters)", "type": "string", "maxLength": 1000000, "default": "{\n \"format\": \"flipline-xsheet\",\n \"version\": 1,\n \"name\": \"Paper bird\",\n \"fps\": 12,\n \"source\": {\n \"format\": \"flipline\",\n \"version\": 1,\n \"name\": \"Paper bird\",\n \"width\": 960,\n \"height\": 540,\n \"fps\": 12,\n \"background\": 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