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Ludo AI Game Assets

by ai.ludo
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Edit spritesheet

editSpritesheet

Edit a previously generated spritesheet: re-prompt its underlying animation (edit_mode "prompt"), extend the frame beyond its borders ("outpaint"), repair a bad loop ("fix_loop"), or re-render it with finer detail ("improve": the extra pass hydra-plus runs when it generates, on a spritesheet generated with hydra only - any other returns HTTP 400; a sheet generated on hydra-plus already has it). Pass the spritesheet_url you received from animateSprite, animateSpriteKeyframes, transferMotion, or an earlier edit - it must be a spritesheet you generated within the last 7 days; arbitrary external images are not accepted. Omit duration, frames, frame_size, crop and model to keep the source spritesheet's values. A prompt is required for edit_mode "prompt", optional for "outpaint", and not accepted for "fix_loop" or "improve"; optionally add up to 5 reference images (URL or base64) to guide the edit. The job result is the same result shape as animateSprite (spritesheet URL, frame layout, optional GIF or individual frames). Credits are held when the job is accepted; the final charge is rate × seconds of video generated, never more than was held, and the difference (or everything, if the job fails or is cancelled) is refunded. The returned sheet is then trimmed to its best loop and can run slightly shorter than the video; that trim is not deducted. Prompt edits are priced per model (credits/second × duration) and held for the duration you requested; "outpaint", "fix_loop" and "improve" run a lighter pipeline in which model is ignored and are billed at a flat 1 credit per second of output, held for and capped at the length of the source spritesheet's video (duration does not change their price). Outpaint decides the extra margin itself - there is no amount parameter. The result carries the same fields as animateSprite (spritesheet_url, video_url, grid fields); new audio is generated only by prompt edits on hydra: "fix_loop", "outpaint" and "improve" do not regenerate it, and their result carries the source spritesheet's audio_url when it had one. Pass an optional request_id to tag the result for later retrieval via listGenerations (type spritesheet). Async generation job: returns {id, status} - poll getApiJob (job and credit contract: see the server instructions).

Credits: edit_mode "fix_loop" / "outpaint": flat 1 credit per second of output, capped at the source spritesheet's video length, no minimum, model ignored; edit_mode "improve" (hydra spritesheets only): flat 1 credit per second of output, same terms; edit_mode "prompt": per model as listed - credits/s × seconds, per model: Hydra 3/s, Griffin 12 flat, Forge 2/s, Forge Pixel 2/s; flat = credits per generation; see this endpoint's full pricing table in the API docs.

Input Schema

NameRequiredDescriptionDefault
requestBodyYesPayload for editing a previously generated spritesheet. edit_mode selects the operation - prompt-driven edit (default), outpaint, loop fixing, or improve (finer detail, on hydra spritesheets only).

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changed
    • changedInput schema / properties / requestBody / properties / duration / description
      Previous value: -"Duration in seconds. Available values depend on the model:\n- hydra: 3, 3.5, 4, 4.5, 5\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5"New value: +"Duration in seconds. Available values depend on the model:\n- hydra: 3, 3.5, 4, 4.5, 5\n- griffin-hd: 5\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5"
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s · Best for low-res pixel art animations Default: \"hydra\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s · Most reliable all-around model, generates audio\n- \"griffin-hd\" (Griffin): flat 12 credits per generation · High resolution animations, best for highly detailed sprites\n- \"forge\" (Forge): 2 credits/s · Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s · Best for low-res pixel art animations Default: \"hydra\"."
    • changedInput schema / properties / requestBody / properties / model / enum
      Previous value: -[
-  "hydra",
-  "forge",
-  "forge-pixel"
-]New value: +[
+  "hydra",
+  "griffin-hd",
+  "forge",
+  "forge-pixel"
+]
  2. Changed1 schema field changed
    • addedInput schema / properties / requestBody / properties / use_pixel_grid
      Added value: +{
+  "description": "Use the animation's pixel grid if one is detected. true: when Ludo detects a pixel grid with confidence, the sheet is packed on it (logical pixels, scaled up by whole blocks); when none is detected, this has no effect. false: always pack as ordinary art, for when the detected grid is wrong for your asset (for example a smooth sprite coming back as coarse blocks). Ignored for forge-pixel animations, which are always packed on their grid. Unset keeps the source spritesheet's setting (true unless it was made with false).",
+  "type": "boolean"
+}
  3. Changed4 schema fields changed
    • changedInput schema / properties / requestBody / description
      Previous value: -"Payload for editing a previously generated spritesheet. edit_mode selects the operation - prompt-driven edit (default), outpaint, or loop fixing."New value: +"Payload for editing a previously generated spritesheet. edit_mode selects the operation - prompt-driven edit (default), outpaint, loop fixing, or improve (finer detail, on hydra spritesheets only)."
    • changedInput schema / properties / requestBody / properties / edit_mode / description
      Previous value: -"Edit operation to perform. Default: \"prompt\"."New value: +"Edit operation to perform. \"improve\" re-renders the animation with finer detail (the extra pass hydra-plus runs when it generates) and only takes a spritesheet generated with hydra; any other source returns HTTP 400, including an already improved spritesheet (or a loop fix or outpaint of one), which has that detail already. Default: \"prompt\"."
    • changedInput schema / properties / requestBody / properties / edit_mode / enum
      Previous value: -[
-  "prompt",
-  "outpaint",
-  "fix_loop"
-]New value: +[
+  "prompt",
+  "outpaint",
+  "fix_loop",
+  "improve"
+]
    • changedInput schema / properties / requestBody / properties / prompt / description
      Previous value: -"Edit instruction. Required for edit_mode \"prompt\", optional for \"outpaint\", not accepted for \"fix_loop\". Focus it on a single change and keep it short (under about 50 words); run a second edit for more."New value: +"Edit instruction. Required for edit_mode \"prompt\", optional for \"outpaint\", not accepted for \"fix_loop\" or \"improve\". Focus it on a single change and keep it short (under about 50 words); run a second edit for more."
  4. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, min charge 9 credits · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s · Best for low-res pixel art animations Default: \"hydra\"."
  5. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / frame_size / description
      Previous value: -"Size of each frame in pixels (width and height). 0 is for maximum resolution. Omit to keep the source spritesheet's frame size. Accepted values: 32, 64, 96, 128, 192, 256, 384, 0."New value: +"Size of the sprite in pixels, not of the frame - it sets how big the character is drawn, and each frame also holds the space around it, so frames come out larger than this value. 0 is for maximum resolution. Omit to keep the source spritesheet's setting. Accepted values: 32, 64, 96, 128, 192, 256, 384, 0."
  6. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / frames / description
      Previous value: -"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Allow about one second of duration per 12 frames - above that the model may not be able to produce them all. Accepted values: 4, 9, 16, 25, 36, 49, 64."New value: +"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Allow about one second of duration per 16 frames - above that the model may not be able to produce them all. Accepted values: 4, 9, 16, 25, 36, 49, 64."
  7. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / frames / description
      Previous value: -"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Allow about one second of duration per 12 frames - above that the model may not be able to produce them all. 49 and 64 are more prone to looping issues and motion blur. Accepted values: 4, 9, 16, 25, 36, 49, 64."New value: +"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Allow about one second of duration per 12 frames - above that the model may not be able to produce them all. Accepted values: 4, 9, 16, 25, 36, 49, 64."
  8. Changed4 schema fields changed
    • changedInput schema / properties / requestBody / properties / frames / description
      Previous value: -"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Accepted values: 4, 9, 16, 25, 36, 49, 64."New value: +"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Allow about one second of duration per 12 frames - above that the model may not be able to produce them all. 49 and 64 are more prone to looping issues and motion blur. Accepted values: 4, 9, 16, 25, 36, 49, 64."
    • changedInput schema / properties / requestBody / properties / images / description
      Previous value: -"Optional reference images (up to 5), each a URL or base64, to guide the edit."New value: +"Optional reference images (up to 5), each a URL or base64, to guide the edit. Two, at most three, work best: more references reduce the model's ability to use any of them correctly."
    • changedInput schema / properties / requestBody / properties / prompt / description
      Previous value: -"Edit instruction. Required for edit_mode \"prompt\", optional for \"outpaint\", not accepted for \"fix_loop\"."New value: +"Edit instruction. Required for edit_mode \"prompt\", optional for \"outpaint\", not accepted for \"fix_loop\". Focus it on a single change and keep it short (under about 50 words); run a second edit for more."
    • changedInput schema / properties / requestBody / properties / spritesheet_url / description
      Previous value: -"URL of a spritesheet you generated in the last 7 days (returned by animateSprite, transferMotion, or a previous edit as spritesheet_url). External URLs are not accepted."New value: +"URL of a spritesheet you generated in the last 7 days (returned by animateSprite, transferMotion, or a previous edit as spritesheet_url). External URLs are not accepted. Edit the original animation rather than a previous edit's result: every edit re-renders the whole animation, so colors and detail drift further with each pass. If an edit did not work, retry from the original instead of editing on top."
  9. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, min charge 9 credits · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."
  10. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Sharper detail, simpler motion. Best for simple body shapes and short actions; may need a few tries\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."
  11. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"forge\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"hydra\"."
  12. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"forge\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable all-around model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"forge\"."
  13. Changed9 schema fields changed
    • changedInput schema / properties / requestBody / properties / crop / description
      Previous value: -"Crop sprite frames to fit content. Results in smaller spritesheets but inconsistent frame sizes across different animations."New value: +"Crop sprite frames to fit content (omit to keep the source spritesheet's setting). Results in smaller spritesheets but inconsistent frame sizes across different animations."
    • changedInput schema / properties / requestBody / properties / frame_size / description
      Previous value: -"Size of each frame in pixels (width and height). 0 is for maximum resolution. Defaults to the source spritesheet's frame size. Accepted values: 32, 64, 96, 128, 192, 256, 384, 0."New value: +"Size of each frame in pixels (width and height). 0 is for maximum resolution. Omit to keep the source spritesheet's frame size. Accepted values: 32, 64, 96, 128, 192, 256, 384, 0."
    • removedInput schema / properties / requestBody / properties / frame_size / example
      Removed value: -32
    • changedInput schema / properties / requestBody / properties / frames / description
      Previous value: -"Number of frames in the output spritesheet. Defaults to the source spritesheet's frame count. Accepted values: 4, 9, 16, 25, 36, 49, 64."New value: +"Number of frames in the output spritesheet. Omit to keep the source spritesheet's frame count. Accepted values: 4, 9, 16, 25, 36, 49, 64."
    • removedInput schema / properties / requestBody / properties / frames / example
      Removed value: -4
    • removedInput schema / properties / requestBody / properties / loop / example
      Removed value: -true
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, shortest duration 3s, so 9 credits minimum · Most capable model, generates audio\n- \"forge\" (Forge): 2 credits/s, min charge 4 credits · Cost-effective for simple editing tasks\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min charge 4 credits · Best for low-res pixel art animations Default: \"forge\"."
    • removedInput schema / properties / requestBody / properties / model / example
      Removed value: -"forge"
    • changedInput schema / properties / requestBody / properties / request_id / description
      Previous value: -"Optional client-provided identifier, unique per request. Re-sending the same request_id returns the existing job instead of generating again. Also usable with the results endpoint."New value: +"Optional client-provided identifier, unique per request. Re-sending the same request_id returns the existing job instead of generating again. Also usable as the request_id filter of listGenerations."
  14. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, min 4\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."
  15. Changed3 schema fields changed
    • changedInput schema / properties / requestBody / properties / duration / description
      Previous value: -"Duration in seconds. Available values depend on the model:\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4"New value: +"Duration in seconds. Available values depend on the model:\n- hydra: 3, 3.5, 4, 4.5, 5\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5"
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."New value: +"Model to use. Available models:\n- \"hydra\" (Hydra): 3 credits/s, min 4\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."
    • changedInput schema / properties / requestBody / properties / model / enum
      Previous value: -[
-  "forge",
-  "forge-pixel"
-]New value: +[
+  "hydra",
+  "forge",
+  "forge-pixel"
+]
  16. Changed12 schema fields changed
    • removedInput schema / properties / requestBody / properties / edit_mode / default
      Removed value: -"prompt"
    • changedInput schema / properties / requestBody / properties / edit_mode / description
      Previous value: -"Edit operation to perform."New value: +"Edit operation to perform. Default: \"prompt\"."
    • removedInput schema / properties / requestBody / properties / gif / default
      Removed value: -false
    • changedInput schema / properties / requestBody / properties / gif / description
      Previous value: -"When true, generates an animated GIF from the spritesheet and returns it in gif_url. Disabled by default to reduce response time."New value: +"When true, generates an animated GIF from the spritesheet and returns it in gif_url. Disabled by default to reduce response time. Default: false."
    • removedInput schema / properties / requestBody / properties / individual_frames / default
      Removed value: -false
    • changedInput schema / properties / requestBody / properties / individual_frames / description
      Previous value: -"When true, extracts each frame from the spritesheet as an individual image and returns the URLs in individual_frame_urls."New value: +"When true, extracts each frame from the spritesheet as an individual image and returns the URLs in individual_frame_urls. Default: false."
    • removedInput schema / properties / requestBody / properties / loop / default
      Removed value: -true
    • changedInput schema / properties / requestBody / properties / loop / description
      Previous value: -"Trim the animation at the beginning or end to create a seamless loop."New value: +"Trim the animation at the beginning or end to create a seamless loop. Default: true."
    • removedInput schema / properties / requestBody / properties / model / default
      Removed value: -"forge"
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4"New value: +"Model to use. Available models:\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4 Default: \"forge\"."
    • removedInput schema / properties / requestBody / properties / spritesheet_with_background / default
      Removed value: -false
    • changedInput schema / properties / requestBody / properties / spritesheet_with_background / description
      Previous value: -"When true, also returns the spritesheet with background intact (before background removal). The with-background spritesheet URL will be in spritesheet_with_background_url."New value: +"When true, also returns the spritesheet with background intact (before background removal). The with-background spritesheet URL will be in spritesheet_with_background_url. Default: false."
  17. Changed1 schema field changed
    • changedInput schema / properties / requestBody / description
      Previous value: -"Payload for editing a previously generated spritesheet. edit_mode selects the operation — prompt-driven edit (default), outpaint, or loop fixing."New value: +"Payload for editing a previously generated spritesheet. edit_mode selects the operation - prompt-driven edit (default), outpaint, or loop fixing."
  18. Changed1 schema field changed
    • changedInput schema / properties / requestBody / properties / request_id / description
      Previous value: -"Optional client-provided identifier for this request. Use this to retrieve results later via the results endpoint."New value: +"Optional client-provided identifier, unique per request. Re-sending the same request_id returns the existing job instead of generating again. Also usable with the results endpoint."
  19. Changed3 schema fields changed
    • changedInput schema / properties / requestBody / properties / duration / description
      Previous value: -"Duration in seconds. Available values depend on the model:\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4"New value: +"Duration in seconds. Available values depend on the model:\n- forge: 1, 1.5, 2, 2.5, 3, 3.5, 4\n- forge-pixel: 1, 1.5, 2, 2.5, 3, 3.5, 4"
    • changedInput schema / properties / requestBody / properties / model / description
      Previous value: -"Model to use. Available models:\n- \"forge\" (Forge): 2 credits/s, min 4"New value: +"Model to use. Available models:\n- \"forge\" (Forge): 2 credits/s, min 4\n- \"forge-pixel\" (Forge Pixel): 2 credits/s, min 4"
    • changedInput schema / properties / requestBody / properties / model / enum
      Previous value: -[
-  "forge"
-]New value: +[
+  "forge",
+  "forge-pixel"
+]
  20. Added

TDQS

A4.5/5.0
Behavior5/5

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

Beyond the annotations, the description discloses that this is an async generation job returning {id, status}, that callers must poll getApiJob, that credits are held and partially refunded, and that "improve" returns HTTP 400 on non-hydra sheets. It also explains audio regeneration behavior and result-shape parity with animateSprite, which is substantial behavioral context not carried by 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?

The description is front-loaded and organized around modes, source constraints, prompt rules, credits, and async behavior. However, it is very long, uses dense sentences, and repeats the credit/pricing information twice, which weakens conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a complex async editing tool with no output schema, the description covers the essential gaps: source validity, edit-mode semantics, prompt requirements, billing and refunds, polling, result shape, audio behavior, and retry guidance. An agent has enough information to invoke it correctly without opening the schema.

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?

Schema description coverage is already 100%, so the baseline is 3, but the description adds useful conditional semantics: prompt is required/optional/not accepted by edit_mode, omitted fields inherit source values, model is ignored for outpaint/fix_loop/improve, and request_id tags results for listGenerations. Some of this repeats the schema, but the cross-parameter interactions add real value.

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?

The description opens with a specific verb and resource, "Edit a previously generated spritesheet," and immediately enumerates the four edit modes. It clearly distinguishes this from generation siblings by requiring a spritesheet_url produced by animateSprite, animateSpriteKeyframes, transferMotion, or an earlier edit.

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

Usage Guidelines4/5

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

It gives detailed mode-specific usage rules: prompt is required for "prompt," optional for "outpaint," and not accepted for "fix_loop" or "improve"; it also explains source-age constraints, parameter inheritance, and pricing behavior. It does not explicitly contrast this tool with the sibling adjustSpritesheet, so the alternative-routing guidance is not complete enough for a 5.

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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