T3LabLite

T3Lab Lite

T3Lab Lite is a pyRevit extension running on CPython 3 built for Revit users who want to work faster. It covers batch export, sheet & view management, datum & crop synchronization, CAD-to-BIM conversion, model auditing, rebar and assembly detailing (cast units, drawing cloning, BVBS export), IFC-SG compliance, family generation and management, a built-in AI assistant that runs Revit tools from plain Vietnamese or English, and MCP integration that lets Claude AI work with Revit directly.

See CHANGELOG.md for what's new in each release.

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Installation

T3Lab Lite is installed as a pyRevit extension.

▶ Install pyRevit

▶ Open Extensions Menu

▶ Add T3Lab Lite

▶ Click Install

Staying up to date

You never have to click anything. On the first Revit start of each week (Monday to Sunday), T3Lab checks GitHub for a newer release and installs it in the background. Revit keeps running the version it loaded, so the update takes effect the next time you start Revit — a notification tells you when that is worth doing. Restart Revit rather than using pyRevit ▸ Reload: on Revit 2025+ a Reload stops every T3Lab tool until Revit restarts. If GitHub cannot be reached (offline, blocked), the next day's first start tries again until the check gets an answer, so a bad Monday does not cost you the week.

A clone with local commits or edits is only ever fast-forwarded, never overwritten. Two settings in %APPDATA%\T3LabAI\mcp_paths.json: "auto_update": false turns the automatic check off, and "auto_update_interval": "daily" checks every day instead of every week. Check Update (Support ▸ Settings) updates on demand either way, and %APPDATA%\T3LabAI\update.log records what happened.

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Tools

The ribbon has the same six panels as t3lab-revit-api: Support, Standards & Families, Model & Datum, Rebar & Assembly, Annotation & Data and Views & Sheets. All tools run on the high-performance CPython 3 engine.

Tools that process many elements — Model Auditor, ManaSheets, ManaViews, SheetGen, FamiGen, IFC-SG Suite, Tile Layout, Auto Join, Room To Floor, Image to Drafting, CAD to Elements and BatchOut — show a progress bar with Pause and Stop while they run, so a long batch can be paused or cancelled without killing Revit.

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Support

T3Lab Assistant

The AI assistant, in Revit. Ask about the model or tell it what to change, in Vietnamese or English — it calls real Revit tools, opens T3Lab tools for you, and by default presents a plan and waits for your confirmation before changing the model (deletes always ask). It opens from the T3Lab Assistant button on this panel as a window, docks as a native Revit pane beside Properties / Project Browser, and is also in the right-click menu (Revit 2025+).

• Skills — reusable instruction packs that activate on what you ask, 33 built in (ISO 19650 naming, LOD, worksets, QA checklist, BEP, COBie handover, clash coordination, sheet & annotation standards, construction wiki and drawing-completion rules, …). Type /skill-name to force one, or install more from a GitHub repo — Claude's SKILL.md format is read as-is.
• Knowledge (RAG) — index folders of PDF / TXT / MD and get answers with citations. Keyword search works offline; semantic search is optional and runs on a local Ollama embedding model.
• Projects — per-project chat history, custom instructions, default model, knowledge folders, remembered facts, and daily scheduled prompts.
• Project memory shared with Claude — facts the Assistant remembers ("remember that ...") and conventions saved by AI apps through MCP (t3lab_memory_save) are one memory per project. Claude Code's memory of the project's linked folders (CLAUDE.md, auto memory) is searched too, read only. A long memory reaches the prompt as an index and the Assistant searches the rest with recall_memory, so each message stays small.
• Remote MCP servers (Claude) — add MCP servers on the internet (https) in LLMs Setting → Models; Claude runs their tools through its MCP connector. Those calls do not go through "Ask before model edits".
• Context & attachments — the assistant sees the active view and current selection, and accepts attached files and images.
• PDF comments — read markups from a PDF, trace them to the matching sheet, and resolve them item by item.
• Spell check — proofread every Text Note in the model or just the active view.

Settings (pulldown)

• MCP Control — start and stop the local MCP server that lets Claude AI (and other MCP clients) interact directly with Revit, connect Claude Desktop / Codex / Antigravity in one click, pick the port (48884–48894) and set what AI apps may do (read-only mode, confirmations, code execution — see MCP security).
• LLMs Setting — the settings hub shared by every AI-powered T3Lab tool: provider (Claude, OpenAI, Gemini, DeepSeek, any OpenAI-compatible server — OpenRouter, Azure OpenAI, vLLM/LiteLLM, Groq, Mistral, xAI —, Ollama, LM Studio), model, API key or server URL, live connection status per provider and a test message; plus your display name, "ask before model edits", deep reasoning / maximum quality, chat detail, and the Projects, Knowledge and Skills tabs.
• Feedback — send feedback or suggestions to the T3Lab team directly from Revit.
• ManaTabs — hide or show Revit ribbon tabs to reduce clutter.
• Ribbon Names — shorten or restore ribbon tab names with inline editing and saved mappings.
• BG Theme — set the model-view background colour. Presets, RGB sliders, HEX input, and live preview. SHIFT+Click cycles Black → Gray → White.
• Check Update — compare the installed version (version.txt) with the latest release on GitHub and update via git or direct download — see Staying up to date.
  • Version Detection — queries GitHub repository releases and mirrors (jsDelivr) to prevent rate limits.
  • What's New Preview — automatically extracts release notes from CHANGELOG.md between local and remote versions.
  • Safe Updating — pulls updates via git pull --ff-only when running from a git clone (protecting local edits) or downloads and extracts the release archive.
  • Restart prompt — tells you to restart Revit so the updated tools load.

Cloud Links

Quick links to Autodesk Forma and the Autodesk Health dashboard, plus PDF Markup — a split button with Bluebeam Status and T3Lab PDF Markup (opens T3Lab PDF, offline PDF markup for drawings). The one you used last stays on top, also after Revit restarts.

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Standards & Families

Standards (Model Auditor · ManaStyles · ManaWorkset)

• Model Auditor — consolidated model health checks in one window:
  • Model Check — verify model standards and quality rules.
  • Smart Purge — safe, category-based model cleanup removing unreferenced views, unused families, and unplaced elements.
  • Warnings — review and address the Revit warning list.
  • In-Place Models — list and manage in-place family instances.
  • Material List — audit all materials used in the model.
• ManaStyles — manage fill patterns, line styles and line patterns, apply graphic override colours by category rule (Color Splasher), and view and adjust element XYZ coordinates in a grid.
• ManaWorkset — enable worksharing on a model, create and delete worksets, assign elements to worksets by rule (category, level, or type), and generate view filters from workset membership.

Managers (ManaLoca · ManaGroup · BatchLink)

• ManaLoca — list the elements of the active view or a level and edit their XYZ coordinates in a data grid, committed in one transaction. The window stays open while you work.
• ManaGroup — manage Revit Model Groups and Detail Groups: list group types and placed instances, count references, and audit unused group definitions.
• BatchLink — manage Revit links (status, reload, unload, pin, remove, Switch to Cloud), batch-link models from a folder or from Autodesk Docs as cloud links, set the workset each link sits on, and control per-view link display.

ManaFami

Family manager. Batch Operations lists families, system types, model groups or assemblies; find and replace, add a prefix or suffix and change case, review every staged change in the grid, then apply it in one undoable step. Family Loader loads new families from a local folder (or a cloud catalogue you configure) into the project.

Family Transfer

Transfer families and selected types between open project documents or loaded links with category filtering, conflict resolution (overwrite, rename, skip), and single-transaction undo.

FamiGen

Create Revit families from external data: from CAD (scan imported DWG blocks and export each unique block as an .rfa), from a JSON schema (fully parametric families), or in batch from built-in presets. Can draft the schema with your configured AI provider.

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Model & Datum

CAD to Elements

Convert CAD linework into Walls, Floors, or Beams by layer and colour mapping.

Point Cloud to Model

Scan-to-BIM wizard that auto-detects Walls, Floors, Ceilings, Doors, Windows, Columns, Stairs, and Roof planes from a point cloud.

Tools (Finishes · Reference · Modify)

Finishes

• Room To Floor — create architectural or structural floors from selected room boundaries.
• Door Threshold — create threshold floors at the base of selected doors, sized to the opening and host wall.
• Tile Layout — 3-step wizard to extract floor boundaries, choose a tile pattern per floor, and place the generated tile layout on the active sheet.

Reference

• Image to Drafting — create a Drafting View and import an image from disk or clipboard.
• Property Line — create property lines from Lightbox parcel survey data. Supports metes-and-bounds descriptions and coordinate-based input.
• Text to Element — transfer Text Note content to element parameters via bounding-box overlap in the active view.

Modify

• Auto Join — automatically join intersecting elements by category rules (Shift+Click for quick join).
• Split Elements — split Walls, Columns, or Floors at selected levels, preserving parameters.
• Wall Cut Profile — create wall openings where ducts, pipes, cable trays, beams or columns cross walls, from the open model plus any linked models you tick.
• DatumSync — synchronize grid lines, levels, and reference planes across views. Align 2D/3D extents, datum bubbles, and visibility between a source view and target views to maintain clean documentation.
• Auto Adjust Base Offset — recalculate Base Offset when changing Base Constraint so elements keep their absolute elevation.

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Rebar & Assembly

Cast Unit Manager

Create assemblies with their rebar for many beams, columns or footings at once (from the selection or a filter), sync loose rebar into its assembly, rename marks as a series (prefix + start + step per assembly type), and set the rebar Partition by rule (assembly mark, level, host type or workset). Hosts in a group, from a link, or already in an assembly are skipped, with the reason shown before anything runs.

Clone Drawing

Copy the finished drawing of one assembly — views, sheet, annotations, tags, dimensions and spot elevations — to similar assemblies. Clone settings are chosen per object type and saved as presets; whatever cannot be matched on a target is listed with the reason. One undo step for the whole run; views, sheets and model elements are never deleted.

Rebar Check

Data checks Revit does not run: rebar without a valid host, rebar missing from its assembly, assemblies without drawings, duplicate numbers, bars outside their host, no partition, unknown shape. The scan is read-only; Fix syncs loose rebar into its assembly in one undo step.

BVBS Export

Write BVBS BF2D .abs files for bending machines from shape-driven rebar — one file per assembly or one for all. Preview every mark with the legs that will be written; free-form 3D bars and curved legs are listed as skipped, never exported. Each file is read back and its checksums verified.

Rebar Wizard

Reinforce rectangular beams, columns and pad footings from a preset: beam bottom and top bars with stirrups denser at both ends, column verticals with ties denser at top and bottom, and a two-layer pad-footing mesh. New bars join the host's assembly; presets are saved per user, and one Ctrl+Z undoes the whole run.

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Annotation & Data

Mana (ManaDWG · Auto Dimension · ManaSelect)

• ManaDWG — manage CAD imports and CAD links — list, rename, and delete DWG imports and links from a single interface.
• Auto Dimension — automatically create dimension chains for walls, columns, doors, lifts, and grids in the active or a chosen view.
• ManaSelect — smart selection manager with 4 modes: Quick Select (filter by parameter value or text), Select Similar (by type, family, or category), Select on Sheets (locate title blocks and CAD imports), and a Quick Filters sidebar.

manaData (ManaSched · ManaPara · ManaContains)

• ManaSched — import an Excel or Google Sheets range as a schedule, drafting view or legend with its formatting and keep it linked (Update Tables); export schedule values to Excel, edit, review every change and apply in one undo step.
• ManaPara — Parameter Manager — transfer parameter values between elements by rule, assign Text Note content to element parameters via spatial overlap, and write schedule values into filled region parameters.
• ManaContains — find elements contained in Rooms, Areas, Spaces, Zones, Masses, or Scope Boxes. Assign parameter values to contained elements from their container, or aggregate element data back into the container.

ManaAnno

Annotation manager for Dimensions and Text Notes in one window: find dimensions or notes by type name or content and jump to their view, delete selected dimension instances, auto-rename Dimension and Text Note types from their properties, and set prefix, suffix, above, below or override text on dimensions.

Make Pattern

Vector hatch studio. Draw model and drafting fill patterns on a canvas with grid snapping and ortho lock, set the unit module and stagger shift (running bond), preview the pattern tiled over a large surface, then create it in Revit as a Fill Pattern / Filled Region or export an AutoCAD .pat. Linework can be imported from the selection in the active view.

IFC-SG Suite

Unified IFC-SG manager. Subtype Assigner loads mapping rules from Excel and assigns IFC Export Class and Predefined Type parameters; Compliance Checker verifies that required parameters exist and are filled, against CORENET X rules.

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Views & Sheets

View Tools (SheetGen · CropSync · PDF Import)

• SheetGen — create floor-plan views from a room list. Select rooms, choose a View Family Type and naming template, and generate all views in one transaction.
• CropSync — synchronize crop regions, annotation crops, and crop view settings across selected views to ensure consistent sheet alignment and view boundaries.
• PDF Import — import PDF pages into selected Revit views sequentially. Supports 150 / 300 / 600 DPI.

ManaViews

Browse and filter all views, rename views in bulk with naming rules, update view templates across multiple views, and remove unused views.

ManaSheets

Manage sheets in one unified interface — browse with live search, sync sheet data to/from Excel, place views on sheets, create sheet sets, and renumber sheets.

BatchOut

Export sheets to PDF, DWG, NWD, and IFC formats in batch. Supports combined PDF, custom naming patterns, sheet ordering, and revision tracking.

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Network Traffic

Every connection is user-initiated, the weekly update check, or usage tracking. Both of the last two can be switched off (see Staying up to date and the table below).

Component	Destination	When
Auto-update	github.com / raw.githubusercontent.com / cdn.jsdelivr.net	First Revit start of each week (retried the next day if GitHub was unreachable), unless "auto_update": false
T3Lab Assistant remote MCP servers	Anthropic's servers connect to the https MCP servers you add (Claude only)	Every Assistant message while a server is on
T3Lab Assistant / AI tools	Only the provider you configure: api.anthropic.com, api.openai.com, generativelanguage.googleapis.com, api.deepseek.com, the Base URL you set for Custom — or nothing leaves the machine with Ollama (localhost:11434) / LM Studio (localhost:1234)	User sends a message or runs an AI-powered tool
Skills install	api.github.com — zipball of the repo you paste	User installs or updates skills
Knowledge (semantic search)	Ollama on localhost; the first enable downloads the embedding model (~270 MB)	User turns semantic search on
MCP Server	127.0.0.1:48884–48894 only (never reachable from the network), bearer token from %APPDATA%\T3LabAI\mcp_token.txt	Only while the MCP server is running
Usage tracking	t3lab.space/api/revit/tracking — a hashed machine/user id, Revit version, document name, ribbon button or MCP tool name with its purpose and arguments; the server also records the sender's IP address and approximate location (country, city). Code, secrets and full paths are never sent (paths go as the file name only)	Revit start, ribbon click, MCP tool call — unless "tracking_enabled": false in %APPDATA%\T3LabAI\mcp_paths.json
ManaFami (Cloud)	User-configured Vercel URL in ~/.t3lab/family_loader_config.json	User opens the cloud family catalogue
Feedback	None — opens a mailto: link in the default email client	User sends feedback
Cloud Links	acc.autodesk.com / health.autodesk.com / status.bluebeam.com / pdf.t3lab.space	Opens in the default browser on click

API keys, chat history, projects, attachments and the knowledge index stay on the machine under %APPDATA%\T3LabAI.

MCP security

These rules apply to AI apps connected through MCP (Claude Desktop, Codex, Cursor, ...). The T3Lab Assistant has its own "Ask before edits" setting. Change them in MCP Control → Advanced → Security, or in %APPDATA%\T3LabAI\mcp_paths.json. They apply from the next tool call.

Setting	Default	What it does
mcp_read_only	false	true: AI apps only see and call tools that change neither the model nor any file
mcp_confirm_destructive	true	Revit asks Yes/No before delete, purge, ungroup, deleting a view template or link, save as, sync, close without saving, or a run_batch that contains any of these. No is the default answer
mcp_code_execution	"ask"	send_code_to_revit: "off" hides and refuses it, "ask" asks in Revit each time, "allow" runs it without asking
mcp_toolset	"full"	Which tools AI apps see: "full" (all), "standard" (no teaching / training tools), "documentation" (read tools plus views, sheets, annotation, schedules, revisions and export — nothing that models or deletes). Fewer tools means fewer tokens on every request. A hidden tool is refused, also inside run_batch
auto_start_file_watcher	false	The file task watcher (~/T3Lab_AI_Data/task.json) runs code with no token, so it only starts with Revit after you click Start Watcher once

The Revit question says what the call does, e.g. Delete 3 elements (id 101, 102, 103)? For send_code_to_revit it shows the purpose the AI gives in the description argument, and under it what T3Lab finds in the code itself: deletes, parameter changes, created elements, categories, transaction names, and file, network or program access. The AI cannot hide those by wording its description differently. Show details shows the full code.

Tools are listed with MCP annotations (readOnlyHint, destructiveHint), so clients that support them can ask before edits too. run_batch runs several edits as one Revit undo step and rolls them all back if one fails.

MCP construction wiki & drawing rules

AI apps get the same skill library as the T3Lab Assistant through the read-only t3lab_wiki tool (list, search, read), and the MCP initialize answer tells them to read the drawing rules before they create, annotate, complete or issue drawings. Pages (in Vietnamese):

Page	What it covers
drawing-completion-rules	When a sheet counts as done, the read → plan → fix → check workflow with T3Lab tools, and what the tools cannot do (tags are not de-duplicated, create_dimension takes grids only)
architectural-drawing-rules · structural-drawing-rules · mep-drawing-rules	What each drawing type must show: plans, ceilings, elevations, sections, details; foundation / framing plans, rebar notation, bar schedule; plumbing, HVAC, electrical, fire protection
drawing-issue-checklist	Read-only check before an issue: numbering, drawing index, title blocks, revisions, cross references
drawing-conventions · drawing-set-structure · construction-glossary	Paper sizes, scales, line weights, text heights, symbols, title block; design stages and sheet order; Vietnamese–English–Revit terms

Your own pages in %APPDATA%\T3LabAI\skills and the active project's skills folder are listed next to the built-in ones, and AI apps are told that a project BEP wins over the generic examples in the built-in pages. Pages switched off in LLMs Setting → Skills are hidden from AI apps as well.

Project memory. t3lab_memory (read only: list, search, read) returns what is remembered about the active T3Lab project: conventions saved in the T3Lab Assistant or by an AI app with t3lab_memory_save, and Claude Code's memory of the folders linked to the project (CLAUDE.md, .claude/CLAUDE.md, CLAUDE.local.md, ~/.claude/projects/<folder>/memory). Also the resource t3lab://memory/project. Read-only mode hides t3lab_memory_save; Claude Code's own files are never changed.

The same pages are also MCP resources (t3lab://wiki/<page>), so you can attach one by hand in apps that show resources (Claude Desktop's + menu, @ in Claude Code). Three MCP prompts start the common workflows with the right pages and tools: complete-drawings, issue-drawings and model-health-check (read-only).

MCP protocol versions

The server and the bridge speak MCP 2026-07-28 (no handshake: the version travels with every request, server/discover describes the server) and the earlier 2025-11-25, 2025-06-18, 2025-03-26 and 2024-11-05 (with the initialize handshake), so old and new AI apps both connect. Both eras are answered with Revit closed.