16 added, 21 removed. Audit A to A.
---
name: roblox-studio-mcp
description: "Use when working with Roblox Studio through built-in MCP for scripts, scenes, generated assets, input, or playtesting."
last_reviewed: 2026-08-21
sources:
- https://raw.githubusercontent.com/Roblox/creator-docs/main/content/en-us/studio/mcp.md
- https://raw.githubusercontent.com/Roblox/creator-docs/main/content/en-us/parts/procedural-models.md
- https://create.roblox.com/docs/reference/engine/classes/ProceduralModel
---
# Roblox Studio MCP
## When to Load
- Load when working with Roblox Studio through its MCP server: inspecting or editing scripts, building maps and props, generating or inserting assets, debugging, or playtesting. Skip for standalone code generation with no Studio connection.
+ Load for Studio MCP work: scripts, scenes, assets, debugging, or playtesting. Skip for standalone code generation.
## Quick Reference
- **Bridge first.** Two Studio MCP bridges exist: the **official** (built into Studio, closed-source) and **[chrrxs's](https://github.com/Chrrxs/robloxstudio-mcp)** (`chrrxs/robloxstudio-mcp`, MIT). Detect which is connected (`tools/list`; chrrxs's exposes `get_connected_instances`/`eval_*`/`multiplayer_*`; official exposes `list_roblox_studios` plus per-call `studio_id` parameters).
+ **Route by capability first.** Two Studio MCP bridges exist: the **official** (built into Studio, closed-source) and **[chrrxs's](https://github.com/Chrrxs/robloxstudio-mcp)** (MIT). Route on `tools/list` (`get_connected_instances`/`eval_*`/`multiplayer_*` → chrrxs; `list_roblox_studios` + per-call `studio_id` → official) BEFORE bridge-specific bootstrap.
### Bootstrap before mutation
- 1. `list_roblox_studios` and identify the target.
- 2. Pass the target's `studio_id` on every tool call.
+ 1. Identify the target via `list_roblox_studios` (official) or `get_connected_instances` (chrrxs).
+ 2. Pass the target's `studio_id` (official) or `instance_id` (chrrxs) on every tool call.
3. `get_studio_state` and confirm Edit/Client/Server availability.
4. Inspect the target tree and scripts before changing them.
- Pass `datamodel_type` only where the tool requires it: `Edit` for edit-time, `Client`/`Server` for runtime. Do not guess from a previous session.
-
- ### Capabilities
- - **Inspect:** `search_game_tree`, `inspect_instance`, `script_search`, `script_read`, `script_grep`
- - **Edit/execute:** `multi_edit`, `execute_luau`
- - **Assets:** search and insert existing assets; `generate_mesh`, `generate_material`, `generate_procedural_model`, `wait_job_finished`, `store_image`, `upload_image`
- - **Play/evidence:** `start_stop_play`, `get_console_output`, `screen_capture`, input simulation, `subagent`
-
- Other bridges alias asset tools (e.g. `search_creator_store`/`insert_from_creator_store`).
-
### Execution contract
```text
discover → select Studio/context → inspect → mutate in bounded batches
- → read back → playtest → evidence → clean up or report fallback
+ → read back → start play → evaluate live → evidence → clean up
```
+ Edit-time injection (`multi_edit`, Edit-context `execute_luau`) writes scripts; it never targets a running playtest. Live evaluation targets a running VM: start play, wait for the intended `Client`/`Server` VM, then evaluate there. A stopped VM is never a live-evaluation target. Pass `datamodel_type` only where the tool requires it; do not guess from a previous session.
+
+ ### Capabilities
+ Inspect (`search_game_tree`, `inspect_instance`, `script_read`, `script_grep`), edit/execute (`multi_edit`, `execute_luau`), assets (`search_asset`/`insert_asset`, `generate_*` with `wait_job_finished`, `store_image`/`upload_image`), play/evidence (`start_stop_play`, `get_console_output`, `screen_capture`, input simulation, `subagent`).
+
### Reliability rules
- - `execute_luau` is stateless. Re-acquire references every call.
- - Read before write and read back after every script, asset, or geometry mutation.
- - Generate or insert assets only after choosing between reuse, procedural generation, mesh/material generation, and native fallback.
- - When generation returns an ID, call `wait_job_finished` before dependent edits.
- - Keep large scripts in `multi_edit` chunks, not one oversized execution payload.
+ - `execute_luau` is stateless: re-acquire references every call.
+ - Read before write; read back after every script, asset, or geometry mutation.
+ - Choose reuse vs generation vs native fallback before asset work.
+ - Call `wait_job_finished` before edits that depend on a generation job.
+ - Command-size limits are bridge-specific. Split large scripts into separate bounded `multi_edit`/`execute_luau` writes (or supported multi-edit operations), then read back the full payload to verify.
- If MCP is absent, provide offline Luau and state what was not verified.
- > Full tool mappings, live-schema differences, asset workflows, evidence recipes, and recovery rules: [references/full.md](references/full.md)
+ > Full tool mappings, live schemas, asset workflows, and recovery rules: [references/full.md](references/full.md)