Validation evidence

Validation status as of 2026-10-06; ✅ denotes a completed check and - denotes no validation evidence for that check. CI evidence includes the v0.1.0 release builds for R22-R26 and the R22/R26/R27 CI builds. Local build evidence includes Release.R26 and Release.R27, plus the Revit 2024 build through install.ps1 -Source Build.

Revit year	Build in CI	Local build	Live reads	Live actions	Install script
2022	✅	-	✅	✅	✅
2023	✅	-	✅	✅	✅
2024	✅	✅	✅	✅	✅
2025	✅	-	✅	✅	✅
2026	✅	✅	✅	✅	✅
2027	✅	✅	✅	✅	✅

Live checks use Revit 2026.5 build 26.5.0.55. The September check used Autodesk's Snowdon Towers Sample Architectural.rvt, called from macOS over the SSH transport. All 18 read tools, including the four coordinator tools, are live-validated. Live action checks cover select, show, isolate, move, create_wall, set_parameter, delete and batch, with dry runs and real writes for actions that support them. Installer checks cover -Source Build for 2024 and 2026 with -SignThumbprint, -Source Release for 2024 from v0.1.0, and -Uninstall. Revit 2022 to 2027 were validated live with the v0.9.0 release artifacts, see v0.9.0 live validation. The Install script column also covers the release installers for every year from that pass. Screenshots and JSON evidence are on the validation-assets branch. The Revit undo menu label for a group of actions (MCP (<clientName>): <short summary>) cannot be verified through the API.

Revit 2026 live validation

The October validation covered add-in builds 2db6698 through 7778d0c on Revit 2026 build 26.5.0.55. The consolidated record is tracked in issue #23.

Tool family	Result	Add-in build	Date
Interactive reads	Passed	2db6698	2026-10-01
Model snapshot and prompts	Passed	2db6698	2026-10-01
Safe actions	Passed	2db6698	2026-10-01
Batch collection	11 completed; 2 stopped at error-severity dialogs that required a modifying answer	7778d0c	2026-10-01
Cancellation, worker crash recovery and running-instance isolation	Passed	7778d0c	2026-10-01
Report workbook and Changes sheet	Passed	7778d0c	2026-10-01

Batch collection

All source files remained unchanged. Files saved in Revit 2022 through 2024 were opened in Revit 2026 and upgraded only in memory.

Model	Size (MB)	Saved year	Result	Open (seconds)
M1	194	2022	Completed	1113
M2	265	2022	Failed at open: modifying answer required	-
M3	201	2022	Completed	727
M4	155	2022	Completed	1055
M5	155	2022	Completed	1050
M6	206	2022	Completed	986
M7	213	2022	Completed	987
M8	50	2023	Completed	68.5
M9	31	2024	Completed	54
M10	20	2023	Completed	62
M11	314	2022	Failed at open: modifying answer required	-
M12	169	2022	Completed	1565
M13	180	2022	Completed	1342

The worker peaked at about 7 GB of memory. Completed 150-315 MB models opened in 12-26 minutes. Error-severity dialogs stopped collection where the available continuation required Disconnect or Delete. The unsigned add-in prompt must be accepted once per Revit year, followed by a normal Revit close to persist the choice.

Batch checks

Core policy tests cover state transitions, cancellation and resume, year routing, deadlines, dialog decisions, and the read-only allowlist. Python boundary tests cover input validation, durable state visibility, selected PID, scheduled-task fallback, cancellation, fetch copy, and collisions. Windows CI restores the supervisor with a lock file and checks representative add-in builds, staged artifacts, and MSI contents for the supervisor executable and absence of Autodesk binaries. Live Revit scenarios remain tracked in issue #23; see batch collection.

v0.9.0 live validation

I ran the published v0.9.0 release artifacts against Revit 2022 to 2027 on a Windows workstation. The server was revit-model-mcp==0.9.0 from PyPI, called from macOS over the SSH transport. The add-in came from the installers attached to the release. All 11 release assets matched SHA256SUMS.txt and carried a valid build provenance attestation.

Revit year	Build	Started	Result
2022	22.1.80.32	✅	Reads, action with undo, capture
2023	not recorded	✅	Reads, action with undo, capture
2024	24.3.40.26	✅	Reads, action with undo, capture
2025	not recorded	✅	Reads, action with undo, capture
2026	26.5.0.55	✅	Everything below
2027	27.3.0.28	✅	Reads, action with undo, capture, NWC export

The installers reported version 0.9.0.0 for all six years. Revit 2023 and 2025 were started in a second pass, with the per-user and the per-machine installer. The main model was Autodesk's Snowdon Towers sample, plus its Electrical, Facades, HVAC and Plumbing copies for multi-model runs.

Results

Area	Result
Element capture (revit_capture_elements)	Passed in 3D and plan mode. Targets are red, everything else is halftone. The document stayed unmodified and Undo stayed disabled
Issue register (revit_issue_register)	Passed. The workbook has Cover, Summary with a chart, Register with embedded snapshots and Elements. An invalid element ID became a warning, not a failure
Read-only mode	Capture and register work. All 43 action tools are refused by the server. 38 of them were also checked against the add-in gate file and refused there
Background jobs	An IFC run over four models returned a jobId after 40 seconds and polled to the final result. The result matched the files on disk byte for byte and was identical after a server restart
Job cancellation	Cancelling during the second model stopped the run with two models done and two IFC files written
Session control	Switching documents both ways kept the document count. Ambiguous view names are refused with candidates. Workset patterns, audit=true and revit_new_document passed
Exports	PDF, DWG, IFC and schedule CSV produced non-empty files. NWC export passed on Revit 2026 and 2027 and refused with a clear message on 2023 and 2025, which have no exporter
Highlight	Override, halftone_others, reset and one undo restored the view
Element edits, families, views, sheets, MEP runs, C# code and batch	Every write has a summary and one named undo entry, and revit_undo_last reverts it
Family placement at rooms	Passed on Revit 2026. Seven families were placed inside rooms and one undo removed them
Process models	Dry run, script, output_dir save and the in-place confirmation preview passed. A used token is refused
Installers	Both installers cleaned up after themselves. Revit 2019 gets no add-in folder from either one
Bundle	The .mcpb manifest validates, and the packaged server starts and lists all 77 tools

Screenshots

Capture in 3D. The six targets are red and the rest of the model is halftone.

Capture in a plan. Only the door leaves and swings are red.

Highlighting a view and the MCP activity pane.

The same view after one undo. The activity pane lists the undone row.

Bugs found

The validation found these problems. All of them are fixed on main and ship in the next release.

Problem	Fix
GET /health returned HTTP 500 on the HTTP transport, so no tool call worked over it	#178
revit_update_parameters on doors inside model groups and revit_walls_from_cad with join=true passed the dry run but failed the real run	#185
Installing both installer scopes together left files that neither product removed	#183
A failed in-place confirmation gave a misleading message. revit_execute_code with a short timeout_seconds reported an error while the job ran. The revit_jobs limit of 50 seconds was not documented	#184
Cancelling during the last model reported success: false although every model finished. Several smaller response and wording problems	#180

Related hardening from the same cycle is in #179, #181, #182 and #186. The HTTP transport was not tested again after the fix.

Not covered

• Importing the .mcpb bundle into Claude Desktop. I checked the manifest and the server start only.
• Revit 2019. The folder on the workstation has no Revit.exe.
• The HTTP transport after #178.