Spritecook Workflow Essentials

SpriteCook Workflow Essentials

Use this alongside the SpriteCook image or animation skill whenever SpriteCook MCP tools are available.

Requires: SpriteCook MCP server connected to your editor. Set up with npx spritecook-mcp setup or see spritecook.ai.

Preflight Checklist

1. Check credits first with get_credit_balance before starting a batch or multi-asset workflow.
2. Use each asset's sprite_url as the canonical downloadable image URL. Use spritesheet_url only when it is present and specifically needed.
3. Save important asset_id values in a local manifest whenever there is a writable workspace, unless the user explicitly wants a throwaway result.
4. When a workflow involves follow-up generations or animations for the same subject, identify and reuse the canonical asset_id instead of generating from scratch again.
5. If the agent loses track of generated asset IDs, recover them with list_recent_assets(limit=...) before failing.

Credential Safety

• Never ask the user to paste a SpriteCook API key into chat, prompts, code blocks, shell commands, or generated files.
• Never print, persist, echo, or inline API keys or Authorization headers in agent output.
• Prefer SpriteCook MCP tools, presigned URLs, or a preconfigured local connector/helper that handles authentication outside the prompt.
• If a raw API call is required and no authenticated helper exists, stop and ask the user to configure one.

Async Operations

• Treat generate_game_art, generate_tileset, remove_background, generate_character, generate_character_animations, and animate_game_art as asynchronous operations.
• Follow the returned poll.tool with its exact poll.arguments. Do not invent a polling endpoint or search arbitrary response fields.
• Use operation_id as the generic identifier while retaining the returned job_id or run_id for the matching poll tool.
• Pass wait_seconds only when the tool exposes it and an explicit bounded wait is useful; the normal default is immediate return.
• On a terminal success, consume canonical assets. If the response contains warning.code="asset_output_unavailable", execute its supplied warning.recovery tool call.

Asset Library Tools

• Use spritecook-upload-assets plus create_asset_upload and finalize_asset_upload when a local file path needs to become a SpriteCook asset before animation, editing, reference, or tileset-style reuse.
• Use import_asset(image=..., pixel=..., display_name=..., file_name=...) only when the image is already a small data URL or raw base64 value that can be passed without printing it.
• Use remove_background(asset_id=...) for owned SpriteCook assets that need a transparent cutout. Use remove_background(image=...) only when the user supplies local image data and does not need a reusable imported asset first. Poll the returned job contract for the cleaned asset.
• Use update_asset_label(asset_id=..., label=...) after generation, import, or cleanup when a clearer asset name will help the project manifest or future agent steps.
• Do not tell the user to use the SpriteCook HTTP API or API keys for local image import when the SpriteCook MCP tools are available. Prefer the upload bridge for file paths.

UI Kit Tools

• Use spritecook-build-ui-kits for complete UI screens and cohesive systems. Build or select one concept first, then generate sheets and extract components from that shared visual source.
• If the UI-kit MCP tools are missing, refresh or reconnect the SpriteCook integration. Do not silently substitute several unrelated generate_game_art(mode="ui") calls for a full screen.
• Pass an existing owned concept to create_ui_kit(concept_asset_id=...) when the user or agent already has a suitable SpriteCook asset. Do not regenerate it merely to enter the UI-kit workflow.
• Keep generate_game_art(mode="ui") for a single isolated UI asset such as an icon, badge, control, divider, or decoration.
• Treat UI-kit concept and sheet generation as multi-asset work: check credits first, preserve the kit ID, and poll with get_ui_kit until queued jobs settle.
• Keep gpt-image-2 as the UI-kit model default. Gemini UI-kit concepts require an account that independently supports 2K generation.
• Inspect extraction quality_summary before finalization and follow spritecook-build-ui-kits when it requires corrections.

Preset Tools

• When the user says to use one of their saved presets, call list_presets(query=...) first and identify the best matching preset by title, mode, and status.
• Then call get_preset_settings(preset_id=...) and apply the returned settings as guidance for the next SpriteCook MCP generation or edit tool.
• Treat presets as saved settings and reference guidance, not as a separate generation path.
• Private draft presets can return owned reference asset IDs in settings.reference.styleAssetIds, contextAssetId, and editAssetId.
• For still-image generation, map settings.reference.styleAssetIds to style_asset_ids on generate_game_art; use up to 10 IDs.
• Treat style guide images as ambient style context for new related assets; agents do not need to restate them in the prompt unless calling out a specific visual trait.
• Map settings.reference.contextAssetId to reference_asset_id when the preset provides one specific visual/context reference asset.
• Use reference_asset_id when a prompt refers to one specific source or context asset, such as a particular building, character, prop, or part.
• Use edit_asset_id only for the one asset being directly modified.
• Published presets can return frozen preset media URLs in settings.reference.styleUploadUrls, contextUploadUrl, and editUploadUrl; use these only when the target MCP tool supports upload URL references.
• Use save_private_preset(...) only when the user explicitly asks to save a private preset. It creates a private draft preset only and does not publish, share, or submit anything for moderation.

Defaults

• Prefer smart_crop_mode="tightest" for the best default results. Use "power_of_2" only when the user explicitly asks for it.
• Use Nano Banana 2.1 (model="gemini-nano-banana-2.1") as the recommended default for new pixel-art sprites and base characters. Use pixel=true for generate_game_art; generate_character already uses pixel-art settings.
• Preserve an explicit user model choice, a saved preset's model, or an edit workflow's inherited model. Nano Banana 2 (gemini-3.1-flash-image) is an older option, not the default for new pixel art.
• Call list_generation_models for current availability, pixel-art support, resolution limits, and credit costs. If NB2.1 is unavailable, choose an available pixel-art model from that response; do not guess a replacement model ID.
• NB2.1 supports 1K, 2K, and 4K source generation. Its base per-image price is 12 / 18 / 30 credits respectively, the same as NB2 at release; existing background-removal or workflow charges can still apply. Prefer 1K for ordinary pixel-art sprites, and verify current costs before a larger run.
• Focused workflow defaults override this general guidance. In particular, UI kits default to gpt-image-2 because their concept and sheet pipeline uses 2K output.

Asset Manifest

• Treat asset_id as the primary stable identifier.
• Store a 12-character SHA-256 prefix (sha12) for saved local files.
• Use a minimal manifest entry shape:
  • asset_id
  • sha12
  • optional label
• Prefer a simple machine-readable file such as spritecook-assets.json unless the project already has an asset manifest.
• Before generating a new reference asset or asking the user for an asset id, check the local manifest first.
• Before reusing a local file, compute its sha12 and match it against the manifest to recover the correct asset_id.

Downloading Assets

• For recent-asset recovery flows, prefer list_recent_assets(limit=...).
• Treat sprite_url as the single primary asset URL to inspect, save, or hand off to downstream tools.
• Treat spritesheet_url as an optional secondary artifact. Use it only when present and only when you specifically need a spritesheet export.
• For single-asset inspection flows, get_asset_metadata(asset_id) also exposes canonical asset_id, sprite_url, and optional spritesheet_url fields.
• Treat url, pixel_url, and raw_url as compatibility aliases rather than the primary contract.
• Avoid relying on low-level internal fields such as _presigned_pixel_url or _presigned_url in agent-facing workflows unless no higher-level field is available.
• Avoid direct authenticated download endpoints in skill-driven workflows unless a helper handles auth out of band.