blockwright
MCP server that builds structures on a live Minecraft server over RCON: preview, build, read back, undo. No client mod, no bot.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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ThatHunky
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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.
server_infoMinecraft version, player count, whether world reads/snapshots are available, and the effective blockwright configuration.
get_playersNames, worlds, block positions, look direction and gamemode of online players. Use to pick a build site near someone.
run_commandRun a raw server console command and return its output. Administrative commands (stop, op, ban, whitelist, kick, reload…) are refused unless BLOCKWRIGHT_ALLOW_ADMIN=1. Prefer the build tools; use this for things like time, weather, tp, give, say.
fillFill a box with one block. Modes: replace (optionally only blocks matching replace_filter), keep (only air), destroy (drop items), hollow (walls + air inside), outline (walls only, interior untouched). Splits over the 32768-block command limit automatically.
buildPlace a structure described as layers of characters. palette maps one character to a block state; rows run north→south (z), characters west→east (x); y is height above origin. Space leaves the world alone. Extra single blocks go in "blocks". Rotation keeps the min corner at origin. Run with dry_run=…
place_shapeSphere, dome, cylinder, cone, pyramid, line or circle, filled or hollow. Radius r gives a diameter of 2r+1.
paste_schematicPaste a Sponge .schem or vanilla structure .nbt. By default origin is where the schematic's min corner lands; use_offset=true adds the file's stored offset like WorldEdit //paste. ignore_air skips air so the surroundings survive.
schematic_infoFormat, size, offset, DataVersion, block counts and block-entity count of a .schem/.nbt file.
schematic_writeSave a build spec or a shape as a .schem (Sponge v3) or .nbt (vanilla structure) file without touching any server. Relative paths go to the schematic dir.
previewRender a build spec, a shape, or a schematic as ASCII layer slices (returned) and as a self-contained 3D HTML viewer (path returned; send that file to the user). Set context>0 to include the surrounding world blocks so the design is shown in place. Nothing is changed in the world.
read_regionBlock counts for a box, plus ASCII layer slices when the box is small (≤4096 blocks) or full=true. Use after building to verify the result.
get_blockThe block state at a position.
get_heightmapSurface y and surface block for an x/z rectangle, as a sampled grid (rows = z north→south, columns = x west→east). The site-scouting tool: find flat ground and the y to build at (surface y + 1).
save_schematicCopy a box from the world into a .schem (Sponge v3) or .nbt (structure) file, block entities included.
list_snapshotsSnapshots taken before writes, newest first, with ids for undo.
undoRestore the newest snapshot(s) taken before writes (or a specific id from list_snapshots). Each restored snapshot is removed from the list.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
Vitest: Path Traversal / Arbitrary File Read via @vitest/mocker Redirect Mock
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
16/16 tools missing one or more hints — server_info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_players (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); run_command (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +13 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.
Destructive tools are labelled
1 tool perform destructive updates without destructiveHint — preview deletes at line 84 (fs.rm(full, { force: true }))
Add destructiveHint:true to any tool whose handler calls .delete(), .upsert(), .update(), unlink, rm, DELETE, DROP, REPLACE INTO, or any operation that overwrites existing data.
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