minecraft-schematic-lab
Enables building and previewing Minecraft schematics from natural language descriptions, with live 3D preview and export.
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SimoneRecchia
Source: Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
create_buildCompile a BuildSpec into a schematic and show it in the live browser preview (which opens automatically). Use this to build something from scratch or replace the current build.
get_current_buildReturn the current BuildSpec, stats (block count, palette, size), warnings, the preview URL and the project status.
validate_buildValidate a BuildSpec without changing the current build. Returns validity, errors and warnings (e.g. unknown block ids or out-of-bounds operations).
apply_patchApply an RFC 6902 JSON Patch to the current BuildSpec and rebuild. Use this for incremental changes (e.g. swap a palette block, add an operation) instead of resending the whole spec.
render_previewReturn a compact summary of the current build: size and a per-block-state count, plus the viewer URL and the image preview URL.
render_imageRender the current build as an isometric PNG and return it as an image, so you can actually see the result and judge what to improve.
export_schematicExport the current build to a WorldEdit Sponge .schem file. Returns the filename, size and a download URL the user can click in the browser. Defaults to Sponge v2 (most compatible); pass version 3 for the newer format.
init_git_projectTurn a local folder (inside the home directory) into a git-versioned schematic project. Requires git to be installed. Writes the build spec + .schem and makes the first commit.
save_versionWrite the current build to the git project folder and commit it with the given message.
git_branchSwitch to a branch in the git project, optionally creating it first.
git_pushPush the git project to a remote. Optionally set the remote URL first (https or ssh). The user must have push access configured.
list_sessionsList the in-memory build sessions (each is an independent schematic) and which one is current.
select_sessionMake the given session the current one (subsequent tools act on it).
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@fastify/static vulnerable to route guard bypass via path traversal
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
API_TARGETHOSTLOG_LEVELMCPArchitecture, tools, the HTTP API and the BuildSpec format are documented in [CLAUDE.md](CLAUDE.md).WEB_DIST_PATHPORTDependencies
20 dependencies, 1 flagged: @playwright/test
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
26/26 tools missing one or more hints — create_build (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_current_build (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); validate_build (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +23 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Descriptions match behaviour
1 tool describes read intent but its handler mutates — create_build (line 1428: spawn("open", [url], { detached: true, stdio: "ignore" }))
Rename the tool, rewrite the description, or move the side-effect into a separate clearly-named tool.
Tool inputs are validated
Only 7/26 tool handlers declare input schemas (27%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool test coverage
Only 0/26 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Shell command execution
6 child_process/subprocess calls in production code — runs shell commands (bundle/server.mjs:1428, bundle/server.mjs:1430, bundle/server.mjs:1432)
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Production dependencies are patched
0 critical, 6 high severity in production deps — @fastify/static@8.0.3 (high), @modelcontextprotocol/sdk@1.12.0 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
Dependency freshness
1/8 production deps stale: fast-json-patch@2022-06-17 (4.2y)
Domain consistency
npm scope @minecraft-schematic-lab doesn't match GitHub owner simonerecchia
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
Tool description accuracy
create_build: description implies read-only but handler writes/deletes/executes
Update tool descriptions to accurately reflect all capabilities — especially write, delete, or execute operations.
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