Firefly Iii MCP Server

A Model Context Protocol server that gives an AI assistant access to your own Firefly III instance - 152 operations behind 5 scoped tools, with reading, writing and deleting kept as three separate, explicitly-authorized surfaces instead of one tool that can do all three. It runs locally over stdio via the published package.

People who work with firefly iii, personal finance and self hosted and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-12 · ★ 2 · #47 OF 318 MAINTAINED FINANCE · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install Firefly Iii

before you install - you'll need

Set FIREFLY_API_URL, FIREFLY_API_TOKEN, MCP_AUTH_PASSWORD, MCP_RESOURCE_URL, MCP_AUTH_STATE_DIR before connecting.

Claude Code

claude mcp add yakupemreyerli-mcp-firefly-iii -- npx -y @yakupemreyerli/firefly-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "yakupemreyerli-mcp-firefly-iii": {
      "command": "npx",
      "args": [
        "-y",
        "@yakupemreyerli/firefly-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-08-26 - young repo, little track record yet

license MIT - declared in the repository

npm package @yakupemreyerli/firefly-mcp - published under the repo owner's npm scope (@yakupemreyerli)

registry namespace io.github.YakupEmreYerli is GitHub-verified and matches the repo owner

03 · What Firefly Iii can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can read anything. Its description carries the catalogue, so choosing an operation costs no extra call, create or change a record, and delete a record, or rewrite one field across many records at once.

The 5 tools it gives your agent

Extracted from the project's README - what mcp-firefly-iii lets an agent do.

firefly_query: - Read anything. Its description carries the catalogue, so choosing an operation costs no extra call.
firefly_mutate: - Create or change a record.
firefly_destructive: - Delete a record, or rewrite one field across many records at once.
firefly_list_operations: - What can I do with this entity?
firefly_get_schema: - What parameters does this operation take?

Latest releases

v1.1.2 · 2026-08-30

Security · The HTTP server no longer exits when a request is cut off. A client that · hung up mid-body rejected the read in flight with ECONNRESET, nothing · caught it, and Node turns an unhandled rejection into an…

v1.1.1 · 2026-08-29

Added · mcpName in package.json, so the published npm tarball carries the · ownership marker the official MCP Registry · checks before accepting a server.json publish. 1.1.0 predates this and · does not carry it, which…

v1.1.0 · 2026-08-29

Added · Six transaction operations for changes that span more than one record · without naming ids: bulk_update and bulk_delete take a list of ids, · bulk_update_where and bulk_rewrite take a filter instead…

04 · Who maintains Firefly Iii

mcp-firefly-iii is maintained by yakupemreyerli. It's the only MCP server we track from this author; the repo dates to Aug 2026.

05 · Facts

repository: github.com/yakupemreyerli/mcp-firefly-iii
category: finance - ranked #47 of 318 actively-maintained finance servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-08-30)
registry: io.github.YakupEmreYerli/mcp-firefly-iii (active, first published 2026-08-29 · 2 versions)
packages: npm:@yakupemreyerli/firefly-mcp

06 · Firefly Iii FAQ

Is Firefly Iii still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-12 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

What can Firefly Iii do?

How do I install Firefly Iii?

Run `npx -y @yakupemreyerli/firefly-mcp`. The README documents 5 environment variables (FIREFLY_API_URL, FIREFLY_API_TOKEN, MCP_AUTH_PASSWORD…) to set first. Set FIREFLY_API_URL, FIREFLY_API_TOKEN, MCP_AUTH_PASSWORD, MCP_RESOURCE_URL, MCP_AUTH_STATE_DIR before connecting. You can also paste the ready-made client config above.

Does Firefly Iii run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Firefly Iii

Alternatives to Firefly Iii

Maintained finance servers if Firefly Iii isn't the fit.

Pairs well with

Servers that cover what Firefly Iii doesn't - only shown when the pairing reason fits the companion.

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