Egress routes

The way out of every room: how far, how narrow, which rooms have one way out, and the hose stretch.

What it answers

• How do people get out of each bedroom?
• How much hose do we need to reach the back bedroom?

For the agent, the tool is described as: For one scan: the walking route from every room to the nearest entrance (length, narrowest point, doors), rooms with a single way out, dead-end hallways, bedroom escape windows by sill height, and the hose stretch from each entrance to the farthest point. Returns route overlays and a travel-distance lens.

Who it is for

Apartment manager, Community risk reduction officer, Facility manager, Fire captain, Fire training officer, Family planning home security, Los Angeles household preparing for an earthquake, Older adult or family.

Inputs

Input	Type	Required	Default	Notes
scan	string	yes		Scan id. Filled from the selected building.
min_width_m	number (m)		0.813	Clear width an exit door needs: 32 in (0.813 m). Saved preference access.door_width_m. Range: more than 0.3, at most 3.0.
long_route_m	number (m)		22.9	Routes longer than this are flagged (75 ft, IBC 2021 Table 1006.2.1 common path of egress travel, Group R-2 without sprinklers). Saved preference fire.long_route_m. Range: more than 1.
hose_m	number (m)		61.0	Hose length to compare the stretch with (a 200 ft preconnect). Saved preference fire.preconnect_m. Range: more than 5.

An input that nothing fills (the selected building, a saved preference, a persona’s preset) becomes a question to the person. The agent asks only for those.

Data used

Layer	Id	Needed	If it is missing
Doors and windows	matterport.openings	required	The verdict is unknown, with the reason.
Room names	matterport.room_labels	optional	The tool runs without it.

What it returns

A tool result: a verdict (pass, warn, fail or unknown), metrics, checks and findings, each with its source.

• Draws on the building: a route with its narrow points; a colour per room; doors, walls or rooms coloured by status; pins on what it found.
• Panel blocks: VerdictHeader, MetricRow, CheckList, FloorPlanMini, AssumptionChips, StepLog.
• Speed: fast. Read-only.

How it works

Egress routes: from every room the route out, its length and narrowest point; rooms with one way out, dead ends, bedroom escape windows, and the hose stretch from each entrance to the farthest point.

Reliability

Sources this tool gave on the test cafe:

Where it came from	Layer	Method	Reliability	Note
Measured from the scan	matterport	geometry	medium	Shortest walkable route over the wall graph in empty rooms; furniture is not counted

The tool sets the label for each value. A model never does. The tools give a scan’s wall graph the layer matterport whichever device made the scan, so a phone scan’s geometry carries that label too.

Limits

• Needs: doors and windows. On a scan without it, the verdict is unknown and says why.
• A result is a planning aid, not an inspection.

On the made-up test cafe

This section was written by running the tool when the docs were built, on a hand-made RoomPlan export (no real place was scanned), with no sponsor keys and the network switched off.

Pass Routed 4 rooms; the longest walk out is 8.7 m and the narrowest point 0.71 m. Hose stretch to the farthest point: 15 m.

Value	Result	Where it came from	Reliability
Longest walk out	8.7 m	Measured from the scan	medium
Narrowest point	0.71 m	Measured from the scan	medium
Rooms with one way out	2	Measured from the scan	medium
Longest hose stretch	14.9 m	Measured from the scan	medium
Entrances	2	Measured from the scan	medium
Bathroom	8.7 m	Measured from the scan	medium
Storage	4.2 m	Measured from the scan	medium
Dining Room	4.1 m	Measured from the scan	medium
Kitchen	2.3 m	Measured from the scan	medium

Check	Measured	Against	Status
Distance to an entrance, Bathroom	8.7	22.9 m	pass
Distance to an entrance, Storage	4.2	22.9 m	pass
Distance to an entrance, Dining Room	4.1	22.9 m	pass
Distance to an entrance, Kitchen	2.3	22.9 m	pass
Widest doorway out, clear width	0.86	0.813 m	pass
Doorways to outside or unscanned space on the entry floor	2	2	pass
Longest hose stretch from an entrance	14.9	61 m	pass

Findings: 6 pass.

What it reported while it ran:

1. Found 2 doorways to outside or unscanned space and 3 connections between rooms
2. Routed 4 of 4 rooms to the nearest entrance

Run it

threshold run egress_routes --scan <scan-id>
curl -X POST http://127.0.0.1:8787/api/tools/egress_routes/run -H 'content-type: application/json' -d '{...inputs}'

Over MCP the tool is named egress_routes. See MCP server and CLI.