freeagent-mcp-server

MCP server for the FreeAgent accounting API. Provides 76 tools covering invoices, expenses, contacts, projects, timeslips, banking, bills, estimates, credit notes, accounting reports, and more.

Features

• OAuth2 Authentication - Built-in browser-based auth flow with automatic token refresh
• Company - Company info, business categories, tax timeline
• Users - List, get, create, update, and delete users
• Contacts - Full CRUD for clients and suppliers
• Projects - Create and manage projects
• Tasks - Manage project tasks with billing rates
• Timeslips - Track time with start/stop timer support
• Invoices - Create, send, and manage invoices with status transitions
• Estimates - Quotes, estimates, and proposals with approval workflows
• Bills - Manage supplier bills
• Credit Notes - Issue and manage credit notes
• Expenses - Track and categorize expenses
• Banking - Bank accounts and transaction management
• Categories - Browse accounting categories
• Accounting Reports - Profit & loss, balance sheet, trial balance

Prerequisites

1. Sign up for a FreeAgent Developer account
2. Register an application in the Developer Dashboard
3. Set the OAuth redirect URI to http://localhost:3456/callback
4. Note your Client ID and Client Secret

See the FreeAgent API Quick Start for detailed instructions.

Getting Started

1. Set environment variables

export FREEAGENT_CLIENT_ID="your_client_id"
export FREEAGENT_CLIENT_SECRET="your_client_secret"
# export FREEAGENT_SANDBOX=true  # uncomment to use sandbox instead of production

2. Authenticate (one-time)

npx freeagent-mcp-server auth

This opens your browser to authorize the app. The auth flow supports two modes:

• Automatic (default) - A local server on port 3456 catches the OAuth redirect automatically. This is seamless when the port is available and the redirect URI is configured.
• Manual paste fallback - If the redirect doesn't work (port busy, firewall, etc.), simply copy the full URL from your browser's address bar and paste it into the terminal. The URL will look like http://localhost:3456/callback?code=...&state=....

After approval, tokens are saved to ~/.freeagent-mcp/tokens.json and automatically refreshed when they expire.

3. Configure your MCP client

See the Configuration section below.

Installation

Using npx (recommended)

npx freeagent-mcp-server

Global install

npm install -g freeagent-mcp-server
freeagent-mcp

Build from source

git clone https://github.com/samaxbytez/freeagent-mcp.git
cd freeagent-mcp
npm install
npm run build
npm start

Configuration

Environment Variables

Variable	Required	Description
FREEAGENT_CLIENT_ID	Yes*	OAuth2 client ID from Developer Dashboard
FREEAGENT_CLIENT_SECRET	Yes*	OAuth2 client secret from Developer Dashboard
FREEAGENT_SANDBOX	No	Set to true for sandbox (defaults to production)
FREEAGENT_ACCESS_TOKEN	No	Legacy: direct access token (skips stored token flow)
FREEAGENT_BASE_URL	No	Override API base URL

*Not required if using FREEAGENT_ACCESS_TOKEN directly.

Claude Desktop / Cowork

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "freeagent": {
      "command": "npx",
      "args": ["-y", "freeagent-mcp-server"],
      "env": {
        "FREEAGENT_CLIENT_ID": "your_client_id",
        "FREEAGENT_CLIENT_SECRET": "your_client_secret"
      }
    }
  }
}

This works with both Claude Desktop chat and Claude Cowork. Make sure to run npx freeagent-mcp-server auth in your terminal first to complete the one-time OAuth setup.

Claude Code

Add to your .mcp.json:

{
  "mcpServers": {
    "freeagent": {
      "command": "npx",
      "args": ["-y", "freeagent-mcp-server"],
      "env": {
        "FREEAGENT_CLIENT_ID": "your_client_id",
        "FREEAGENT_CLIENT_SECRET": "your_client_secret"
      }
    }
  }
}

Architecture

freeagent-mcp/
├── src/
│   ├── index.ts              # Entry point, server setup
│   ├── auth.ts               # OAuth2 flow, token storage & refresh
│   ├── client.ts             # FreeAgent API HTTP client
│   ├── utils.ts              # Shared utilities (responses, logging)
│   ├── auth.test.ts          # Auth module tests
│   ├── client.test.ts        # Client tests
│   ├── utils.test.ts         # Utils tests
│   └── tools/
│       ├── company.ts        # Company info tools (3)
│       ├── users.ts          # User management tools (6)
│       ├── contacts.ts       # Contact CRUD tools (5)
│       ├── projects.ts       # Project management tools (5)
│       ├── tasks.ts          # Task management tools (5)
│       ├── timeslips.ts      # Time tracking tools (7)
│       ├── invoices.ts       # Invoice tools (9)
│       ├── estimates.ts      # Estimate tools (7)
│       ├── bills.ts          # Bill management tools (5)
│       ├── credit-notes.ts   # Credit note tools (5)
│       ├── expenses.ts       # Expense tracking tools (5)
│       ├── banking.ts        # Banking tools (7)
│       ├── categories.ts     # Category tools (2)
│       ├── accounting.ts     # Accounting report tools (5)
│       └── tools.test.ts     # Tool handler tests
├── package.json
├── tsconfig.json
└── smithery.yaml

Tools Reference

Company (3 tools)

Tool	Description	API Endpoint
freeagent_get_company	Get company information	GET /company
freeagent_list_business_categories	List business categories	GET /company/business_categories
freeagent_get_tax_timeline	Get tax timeline	GET /company/tax_timeline

Users (6 tools)

Tool	Description	API Endpoint
freeagent_list_users	List users with optional view filter	GET /users
freeagent_get_user	Get a specific user	GET /users/:id
freeagent_get_current_user	Get the authenticated user	GET /users/me
freeagent_create_user	Create a new user	POST /users
freeagent_update_user	Update a user	PUT /users/:id
freeagent_delete_user	Delete a user	DELETE /users/:id

Contacts (5 tools)

Tool	Description	API Endpoint
freeagent_list_contacts	List contacts with filtering and sorting	GET /contacts
freeagent_get_contact	Get a specific contact	GET /contacts/:id
freeagent_create_contact	Create a new contact	POST /contacts
freeagent_update_contact	Update a contact	PUT /contacts/:id
freeagent_delete_contact	Delete a contact	DELETE /contacts/:id

Projects (5 tools)

Tool	Description	API Endpoint
freeagent_list_projects	List projects with optional view filter	GET /projects
freeagent_get_project	Get a specific project	GET /projects/:id
freeagent_create_project	Create a new project	POST /projects
freeagent_update_project	Update a project	PUT /projects/:id
freeagent_delete_project	Delete a project	DELETE /projects/:id

Tasks (5 tools)

Tool	Description	API Endpoint
freeagent_list_tasks	List tasks with optional filtering	GET /tasks
freeagent_get_task	Get a specific task	GET /tasks/:id
freeagent_create_task	Create a new task for a project	POST /tasks
freeagent_update_task	Update a task	PUT /tasks/:id
freeagent_delete_task	Delete a task	DELETE /tasks/:id

Timeslips (7 tools)

Tool	Description	API Endpoint
freeagent_list_timeslips	List timeslips with date and status filters	GET /timeslips
freeagent_get_timeslip	Get a specific timeslip	GET /timeslips/:id
freeagent_create_timeslip	Create a new timeslip	POST /timeslips
freeagent_update_timeslip	Update a timeslip	PUT /timeslips/:id
freeagent_delete_timeslip	Delete a timeslip	DELETE /timeslips/:id
freeagent_start_timer	Start a timer on a timeslip	POST /timeslips/:id/timer
freeagent_stop_timer	Stop a timer on a timeslip	DELETE /timeslips/:id/timer

Invoices (9 tools)

Tool	Description	API Endpoint
freeagent_list_invoices	List invoices with view and contact filters	GET /invoices
freeagent_get_invoice	Get a specific invoice	GET /invoices/:id
freeagent_create_invoice	Create a new invoice	POST /invoices
freeagent_update_invoice	Update an invoice	PUT /invoices/:id
freeagent_delete_invoice	Delete an invoice	DELETE /invoices/:id
freeagent_mark_invoice_as_sent	Mark invoice as sent	PUT /invoices/:id/transitions/mark_as_sent
freeagent_mark_invoice_as_draft	Mark invoice as draft	PUT /invoices/:id/transitions/mark_as_draft
freeagent_mark_invoice_as_cancelled	Cancel an invoice	PUT /invoices/:id/transitions/mark_as_cancelled
freeagent_send_invoice_email	Email an invoice	POST /invoices/:id/send_email

Estimates (7 tools)

Tool	Description	API Endpoint
freeagent_list_estimates	List estimates with filters	GET /estimates
freeagent_get_estimate	Get a specific estimate	GET /estimates/:id
freeagent_create_estimate	Create a new estimate	POST /estimates
freeagent_update_estimate	Update an estimate	PUT /estimates/:id
freeagent_delete_estimate	Delete an estimate	DELETE /estimates/:id
freeagent_mark_estimate_as_sent	Mark estimate as sent	PUT /estimates/:id/transitions/mark_as_sent
freeagent_mark_estimate_as_approved	Mark estimate as approved	PUT /estimates/:id/transitions/mark_as_approved

Bills (5 tools)

Tool	Description	API Endpoint
freeagent_list_bills	List bills with view and date filters	GET /bills
freeagent_get_bill	Get a specific bill	GET /bills/:id
freeagent_create_bill	Create a new bill	POST /bills
freeagent_update_bill	Update a bill	PUT /bills/:id
freeagent_delete_bill	Delete a bill	DELETE /bills/:id

Credit Notes (5 tools)

Tool	Description	API Endpoint
freeagent_list_credit_notes	List credit notes with filters	GET /credit_notes
freeagent_get_credit_note	Get a specific credit note	GET /credit_notes/:id
freeagent_create_credit_note	Create a new credit note	POST /credit_notes
freeagent_update_credit_note	Update a credit note	PUT /credit_notes/:id
freeagent_delete_credit_note	Delete a credit note	DELETE /credit_notes/:id

Expenses (5 tools)

Tool	Description	API Endpoint
freeagent_list_expenses	List expenses with date and project filters	GET /expenses
freeagent_get_expense	Get a specific expense	GET /expenses/:id
freeagent_create_expense	Create a new expense	POST /expenses
freeagent_update_expense	Update an expense	PUT /expenses/:id
freeagent_delete_expense	Delete an expense	DELETE /expenses/:id

Banking (7 tools)

Tool	Description	API Endpoint
freeagent_list_bank_accounts	List bank accounts	GET /bank_accounts
freeagent_get_bank_account	Get a specific bank account	GET /bank_accounts/:id
freeagent_create_bank_account	Create a new bank account	POST /bank_accounts
freeagent_update_bank_account	Update a bank account	PUT /bank_accounts/:id
freeagent_delete_bank_account	Delete a bank account	DELETE /bank_accounts/:id
freeagent_list_bank_transactions	List transactions for a bank account	GET /bank_transactions
freeagent_get_bank_transaction	Get a specific bank transaction	GET /bank_transactions/:id

Categories (2 tools)

Tool	Description	API Endpoint
freeagent_list_categories	List all accounting categories	GET /categories
freeagent_get_category	Get a specific category by nominal code	GET /categories/:nominal_code

Accounting Reports (5 tools)

Tool	Description	API Endpoint
freeagent_get_profit_and_loss	Get profit and loss summary	GET /accounting/profit_and_loss/summary
freeagent_get_balance_sheet	Get balance sheet	GET /accounting/balance_sheet
freeagent_get_opening_balances	Get opening balances	GET /accounting/balance_sheet/opening_balances
freeagent_get_trial_balance	Get trial balance summary	GET /accounting/trial_balance/summary
freeagent_get_trial_balance_opening	Get trial balance opening balances	GET /accounting/trial_balance/summary/opening_balances

Example Prompts

• "Show me the company information from FreeAgent"
• "List all active contacts"
• "Create a new invoice for contact 12345 dated today with 30 day payment terms"
• "How much time did I log this week?"
• "Start a timer on timeslip 67890"
• "Show my profit and loss for the current year"
• "List all overdue invoices"
• "Create an expense for lunch at $25 under the entertainment category"
• "What's my current balance sheet?"
• "List all open bills from suppliers"

Development

# Install dependencies
npm install

# Type check
npm run type-check

# Run tests
npm test

# Run tests in watch mode
npm run test:watch

# Build
npm run build

# Lint
npm run lint

# Format
npm run format

Adding New Tools

1. Create a new file in src/tools/ (or add to an existing one)
2. Follow the pattern: export a registerXxxTools(server, client) function
3. Register each tool with server.tool() or server.registerTool()
4. Always use logToolCall(), jsonResponse(), and errorResponse()
5. Import and call the register function in src/index.ts
6. Add tests in src/tools/tools.test.ts

Troubleshooting

"Missing credentials" error on startup Set FREEAGENT_CLIENT_ID and FREEAGENT_CLIENT_SECRET environment variables, then run npx freeagent-mcp-server auth to authenticate.

"No stored tokens found" You need to complete the one-time auth flow first: npx freeagent-mcp-server auth

Authentication times out If the automatic redirect doesn't work, copy the full URL from your browser's address bar after approving and paste it into the terminal. Ensure your FreeAgent app's redirect URI is set to http://localhost:3456/callback.

Port 3456 is busy The auth flow will automatically fall back to manual paste mode. Just paste the redirect URL from your browser after approving.

401 Unauthorized errors Your tokens may have been revoked. Re-run npx freeagent-mcp-server auth to re-authenticate.

"FreeAgent API error (403)" Your token may not have the required permission level. Check that your FreeAgent app has the appropriate access scopes.

Sandbox vs Production By default the server connects to the FreeAgent production API. Set FREEAGENT_SANDBOX=true to use the sandbox.

Tool not found Ensure you're using the correct tool name with the freeagent_ prefix (e.g., freeagent_list_invoices, not list_invoices).

Empty responses Some endpoints return empty responses for successful DELETE operations. This is expected behavior.

License

MIT