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Game development sprite tools: PNG/GIF to spritesheet conversion, splitting, trimming, and animation.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 1 month ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The spritesheet-forge MCP server exposes 8 tools, focused primarily on general-purpose capabilities. Its published description reads: "Game development sprite tools: PNG/GIF to spritesheet conversion, splitting, trimming, and animation". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates spritesheet-forge F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Hidden instructions in a tool description" and "Hidden instructions in a tool description". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check spritesheet-forge's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add spritesheet-forge to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://mcp.clawstudiouo.com/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
Returns this server's runtime configuration: upload endpoint URL, output file TTL, file size limits, and base64 encoding rules. Call this before working with large files (≥ 4 MB) or when building mult
Merge multiple PNG files into a single spritesheet. Supports grid, horizontal, vertical, and packed (bin-packed) layouts with optional TexturePacker-compatible JSON metadata. Returns a download URL.
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: png_to_spritesheet
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
t path segment. IMPORTANT: this server's upload endpoint renames every filRecommendationRemove model-directed instructions from tool descriptions.
tool: frames_to_animation
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
t path segment. IMPORTANT: this server's upload endpoint renames every filRecommendationRemove model-directed instructions from tool descriptions.
tool: png_to_spritesheet
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
upload_url and token instructions, POST the file there (multipart/foRecommendationRemove side-channel parameters; constrain tool inputs.
tool: png_to_spritesheet
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
ore prepending (shell encoders like openssl insert newlines that causRecommendationAnnotate destructive tools and require human approval.
tool: png_to_spritesheet
A tool description tries to alter the model’s use of another tool.
RecommendationDescriptions must describe only their own tool.
tool: split_spritesheet
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
"file\", Bearer token), and pass the returned URL."},"columns":{"typeRecommendationRemove side-channel parameters; constrain tool inputs.
tool: trim_png
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
upload_url and token instructions, POST the file there (multipart/foRecommendationRemove side-channel parameters; constrain tool inputs.
tool: trim_png
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
ore prepending (shell encoders like openssl insert newlines that causRecommendationAnnotate destructive tools and require human approval.
tool: gif_to_spritesheet
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
upload_url and token instructions, POST the file there (multipart/foRecommendationRemove side-channel parameters; constrain tool inputs.
tool: gif_to_spritesheet
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
ore prepending (shell encoders like openssl insert newlines that causRecommendationAnnotate destructive tools and require human approval.
tool: gif_to_frames
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
upload_url and token instructions, POST the file there (multipart/foRecommendationRemove side-channel parameters; constrain tool inputs.
tool: gif_to_frames
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
ore prepending (shell encoders like openssl insert newlines that causRecommendationAnnotate destructive tools and require human approval.
tool: frames_to_animation
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
"file\", Bearer token), and pass the returned URL."},"duration":{"typRecommendationRemove side-channel parameters; constrain tool inputs.
tool: frames_to_animation
A tool description tries to alter the model’s use of another tool.
RecommendationDescriptions must describe only their own tool.
tool: spritesheet_to_animation
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
upload_url and token instructions, POST the file there (multipart/foRecommendationRemove side-channel parameters; constrain tool inputs.
tool: spritesheet_to_animation
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
ore prepending (shell encoders like openssl insert newlines that causRecommendationAnnotate destructive tools and require human approval.
tool: (server instructions)
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
(4) The Bearer token for uploads is saved to ~/.spritesheet-forge-toRecommendationRemove side-channel parameters; constrain tool inputs.
tool: (server instructions)
Tools that execute commands / write files / make arbitrary requests are exposed without annotations or guards.
(or whenever a shell command does the encoding) use the upload endpoRecommendationAnnotate destructive tools and require human approval.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
ules), call the server_info tool. AGENT TIPS (avoid common mistakes): (1) CRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: png_to_spritesheet
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: split_spritesheet
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: trim_png
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: gif_to_spritesheet
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: gif_to_frames
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: frames_to_animation
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: spritesheet_to_animation
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: (server instructions)
The description pairs a fetch imperative with a hardcoded external URL, letting the server relocate its real instructions off-metadata and mutate them after review. Fires only when a fetch verb and a URL co-occur, so benign documentation links do not.
orkflow guide): https://spritesheet-forge.spritesheet-forge.workers.dev/ — fetch this URL to learn how to use this serveRecommendationDo not direct the model to fetch and act on external URLs; treat linked content as untrusted.
Vantaj uptime monitoring via MCP — manage monitors, heartbeats, incidents, and status pages.
Unified gateway to Algeria's TKAWEN ecosystem: commerce, certification, and AI tools.
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Agentic rails for complex workflows with receipts, fees, and MCP tool access.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Slice a spritesheet PNG into individual frames, generate TexturePacker-compatible atlas JSON, or both. Provide columns+rows (grid mode) or cell_width+cell_height (cell mode).
Crop transparent edges from one or more PNG files. Single file returns PNG; multiple files return a ZIP.
Convert a GIF animation into a spritesheet PNG with all frames arranged in a grid. Optionally remove the background.
Extract all frames from a GIF and return them as individual PNGs in a ZIP archive.
Assemble multiple PNG files into an animated GIF or animated WebP.
Slice a spritesheet PNG into frames and produce an animated GIF or WebP. Provide columns+rows (grid mode) or cell_width+cell_height (cell mode).