Example question
Which jobs are over budget on labor this month?
Early access · MCP connector
One MCP connector for the systems your finance, project, estimating, field and operations teams run: 200 systems, including the older on-premise ones other tools skip.
A selection of the 200 systems Junction connects. See every system
What it is
Junction is an MCP (Model Context Protocol) server that lets Claude or ChatGPT answer questions from the systems a contractor, owner or developer runs: accounting and ERP, job cost, project management and scheduling, estimating, field and safety, property and capital programs, including older on-premise systems such as Sage 300 CRE and Vista. Add one address to your AI tool, sign in, and ask in plain English. Junction fetches the figures from your own systems with the source and the time each was last updated. It cannot change your data, payroll and personal records are excluded by default, and we never run the AI model, so there is no extra AI bill.
01 · Example
This is what your team sees in Claude or ChatGPT once Junction is connected.
Which jobs are over budget on labor this month?
Three jobs are over their labor budget this month. Riverside Medical Office is furthest over, by 12%.
| Job | Labor budget | Labor cost to date | Over by |
|---|---|---|---|
| 1042 · Riverside Medical Office | $184,000 | $206,080 | 12.0% |
| 1037 · Northgate Parking Structure | $96,500 | $101,325 | 5.0% |
| 1051 · Elm Street Lofts | $142,000 | $144,840 | 2.0% |
02 · How it works
We set up a secure link to your accounting and project systems with you. A small outbound-only agent handles older on-premise systems.
Add one connector address to the AI tool your team already uses and sign in. No new app to learn.
Get answers from your own systems, with the source and the time each figure was last updated.
03 · For every team
Each person sees only what administrators allow: chosen systems, kinds of data and jobs.
Controllers, CFOs, AP and AR teams
Typical systems: Vista · Spectrum · Sage 300 CRE · Foundation · QuickBooks Desktop · Deltek Vantagepoint
Project managers, project engineers, superintendents
Typical systems: Primavera P6 · Aconex · Autodesk Build · CMiC · Vista · Fieldwire
Executives, operations managers, estimators
Typical systems: Every connected system, in one conversation
Owners, owner's representatives, program managers
Typical systems: e-Builder · Primavera Unifier · Owner Insite
04 · Security
05 · Systems
Accounting and ERP, project management, estimating, field, property and CRM. Tell us what you run and we set it up with you. Choose a system to see how Junction connects to it.
Featured systems
Vista
Accounting / ERP
Spectrum
Accounting / ERP
Foundation
Accounting / ERP
Sage 300 CRE
Accounting / ERP
ComputerEase
Accounting / ERP
CMiC
Accounting / ERP
QuickBooks Desktop
Accounting / ERP
Autodesk Build
Project management
e-Builder (Trimble Unity Construct)
Owner / capital programs
Owner Insite
Owner / capital programs
More systems
All product names and logos are trademarks of their respective owners. We are not affiliated with or endorsed by any of them.
06 · Compare
The usual ways to get answers out of construction software, side by side.
| Feature | Junction | Spreadsheet exports | BI dashboards | Building your own MCP server |
|---|---|---|---|---|
| Ask questions in plain English | Yes: In Claude or ChatGPT | No: You build the formulas | Partly: Only the views someone built | Yes: Once you have built it |
| Current data | Yes: Read when you ask, with a 'data as of' time | No: As old as the last export | Yes: On the refresh schedule | Yes: If you build it to |
| Older on-premise systems (Sage 300 CRE, on-premise Vista) | Yes: Outbound-only agent, no open ports | Partly: Manual exports | Partly: Usually needs a data gateway | Partly: You build the plumbing |
| Cannot change data, payroll excluded by default | Yes: By design | Partly: Depends who exports what | Partly: Depends on the setup | Partly: If you build it in |
| Several systems in one answer | Yes: One connector, many systems | No: Copy and paste between files | Partly: After a data project | Partly: One server per system, or more work |
| Effort to start | Yes: We set it up with you | Yes: None, but repeated every time | No: Weeks of modelling | No: Months of engineering, then upkeep |
We run everything. You bring your own Claude or ChatGPT account, and we never run the AI model.
07 · Who builds Junction
Junction is built by Sorana Ventures LLP, a team that has spent years building integrations for construction accounting and project systems, including the older on-premise ones. We know where the data lives, how each system names it, and what an IT team will ask before letting anything near it. We work with a small group of contractors and owners as design partners.
At a glance
08 · Questions
An MCP server is a program that lets an AI assistant such as Claude or ChatGPT use an outside system through the Model Context Protocol (MCP), an open standard for connecting AI tools to data. The assistant asks the server for what it needs and the server answers from that system. Junction is an MCP server for construction software: it answers from your accounting and project systems.
Junction is a connector that lets Claude or ChatGPT answer questions from a contractor's accounting and project systems. You add one address to your AI tool, sign in, and ask in plain English, for example which jobs are over budget on labor this month. Junction fetches the figures from your own systems and returns them with the time they were last updated.
Claude and ChatGPT, through their custom-connector feature (ChatGPT requires a plan with developer mode enabled by a workspace admin). Junction uses the Model Context Protocol, an open standard that lets AI assistants connect to outside tools and data.
No. Junction only ever issues read queries, built from a fixed, signed data model, and nothing in the connector can create, edit or delete a record. We also ask you to use database logins and API keys that have read permission only, as a second layer of protection.
That is a main purpose of it. For systems that cannot be reached from the internet, a small Junction agent runs on your own server and connects outward over HTTPS, so you open no inbound firewall ports. The agent only runs queries it builds itself from a signed data model; the cloud never sends it SQL.
No. Payroll and personal records are excluded by default: they are refused in questions and filters and do not appear in the data catalogue the AI sees. You can also limit each person in your company to certain systems, kinds of data and jobs.
We do not run any AI model. You use your own Claude or ChatGPT subscription, and any usage is billed by them. Junction only supplies the data when the assistant asks for it.
When you ask a question, Junction fetches just the rows needed from your system and returns them to your AI tool, passing through our servers in transit. Answers are not stored. We keep an audit log of who asked which tool and system and whether it succeeded, never the values asked for or returned. Systems read through the agent keep their working copy on your own machine.
Yes. Junction is an MCP server for construction systems including Viewpoint Vista, Trimble Spectrum, Sage 300 CRE, Foundation, CMiC, ComputerEase, QuickBooks Desktop, Autodesk Build and e-Builder. Each system is set up with you and checked against your own reports. One Junction connection covers all of your systems, so a single question can draw on several of them. The full list is on the systems page.
Anyone who needs answers from the company's systems: finance and accounting (job cost, billing, payables), project management (budgets, commitments, change orders, issues), operations and leadership (performance across all jobs), and owners' capital-program teams. Administrators decide which systems, kinds of data and jobs each person can reach.
No. Accounting and job cost are where many teams start, but Junction is built to give AI assistants access to whichever system holds the answer: project management and scheduling (Primavera P6, Aconex, Autodesk Build), estimating, field and safety tools, general ERP, property management and CRM. Each person sees only the systems, kinds of data and jobs an administrator allows.
Vista, Spectrum, Foundation, Sage 300 CRE, ComputerEase, CMiC, QuickBooks Desktop, Autodesk Build and e-Builder, and widely used systems such as Primavera P6, Aconex, Fieldwire, Deltek Vantagepoint, Simpro and JD Edwards: 200 systems in all, across construction accounting and ERP, project management, estimating and field, general ERP, property and CRM. We set each one up with a customer who runs it, so that answers can be checked against their own reports.
Pricing is quoted per company, based on the systems you run and how many people will use it. We set up each customer ourselves, so reach out to sales and we will give you a quote.
New to MCP? Read what an MCP server is and why construction teams need one.
09 · Early access
We are bringing systems online with a small group of design partners. Tell us who you are and what you run; we will reply within two business days.