trello-mcp

io.github.avhnPublished by GitHub account avhnv1.0.6Updated Oct 29, 2026

Local Trello MCP with compact responses, workspace allowlists and read-only opt-in.

VerifiedSTDIODesktop onlyProductivity & Workflow Developer Tools

Server details

Identifier: io.github.avhn/trello-mcp
Transport: STDIO
Runtime: Desktop only
Trust: Verified
Published: Oct 16, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified the GitHub account avhn for this listing. That does not show the account is the product's maker.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

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Overview

AI-generated overview

Local Trello MCP server in Go that gives an assistant 48 tools to read and manage boards, lists, cards, comments, checklists and labels with compact responses.

What you can do: Find and use workspaces and boards, including guest boards, and set a default board
Find lists and cards, and read a card's details, comments, checklists and items
Read board activity and actions
Create, update and delete cards, comments, checklists and labels
Upload and download attachments to disk (opt-in, Unix)
Run a read-oriented profile of ten read tools and check server health
When to use it: Useful when you want an assistant to work with Trello boards locally while keeping context small, especially on large boards where response size matters, or when you want a server-side read-only mode or per-object workspace allowlists.
Requirements: Runs as a local binary installed via the provided install script (or PowerShell script on Windows); desktop only, stdio transport. Trello authentication is set up by running a printed auth command yourself in a private terminal, then registering and reconnecting. No environment variables or headers are declared in the manifest.

Before you install

The server can create, update and delete cards, comments and labels, so writes are possible unless read-only mode is enabled. Attachments can be uploaded and downloaded to disk. Authentication output should never be captured; run the auth command yourself in a private terminal. Workspace allowlists limit which objects are reachable.

Installation

In SourceWeft

Open trello-mcp in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

[Image]
trello-mcp

Local Trello MCP server in Go. 48 tools, compact responses, guest boards.

[Release] [CI] [License] [MCP: stdio]

16 cards in one list. Response text, characters. Lower is smaller.

[16 cards in one list, response characters: trello-mcp 6,754, Official 29,141, Node 1.8.1 45,335]

77% less response text than the official server for this call (summary mode). Measured 2026-10-17 on one private work board with 144 cards; characters, not tokens. Full mode: 9,112 (69% fewer). For one card's details the official server returned less: 2,662 vs 2,825. All results and method.

Install

Windows: irm https://raw.githubusercontent.com/avhn/trello-mcp/main/install.ps1 | iex. Checksum-verified.

Or give your agent:

text

Set up trello-mcp by following https://raw.githubusercontent.com/avhn/trello-mcp/main/docs/setup.md; ask me to run its printed absolute-path auth command myself in a private terminal, then reconnect. Never capture authentication output.

Set up trello-mcp by following https://raw.githubusercontent.com/avhn/trello-mcp/main/docs/setup.md; ask me to run its printed absolute-path auth command myself in a private terminal, then reconnect. Never capture authentication output.

Then: run the printed auth command yourself in a private terminal, register, reconnect. Clients and Claude Desktop: docs/setup.md.

Measured comparison

Measured response text. Chars; independent zero-based row scales.

[Five response comparisons; independent row scales]

Tool definitions. Claude tokens from /context, one session. Node not measured. Lower is smaller.

[Claude definition tokens; Node unmeasured]

Claude Code /context in one session; rows over 1k display-rounded to 0.1k. Node could not be loaded into /context. Separately, tools/list: 20,583 vs 33,766 characters (39% fewer vs Node), not tokens.

Call	trello-mcp	Official	Node 1.8.1	vs Official	vs Node
Boards list, per returned board (characters/board)	150	622	8,682	76% fewer	98% fewer
16 cards, summary (characters)	6,754	29,141	45,335	77% fewer	85% fewer
16 cards, full (characters)	9,112	29,141	45,335	69% fewer	80% fewer
50 board actions (characters)	15,494	55,331	71,008	72% fewer	78% fewer
One card's details (characters)	2,825	2,662	16,350	6% more	83% fewer
Comments on that card, 2 comments (characters)	586	1,089	3,232	46% fewer	82% fewer
Tool definitions (Claude tokens)	8,107 (48 tools)	19,664 (15 tools)	Not measured	59% fewer	n/a

One board, one day, one account. trello-mcp at commit cb40466 (v1.0.3); Atlassian hosted https://mcp.trello.com/v1 over OAuth, results captured verbatim from a headless Claude Code session; @delorenj/mcp-server-trello 1.8.1 via npx. Board list figures are characters per returned board over different sets (16 / 15 / 29; Node includes 13 closed boards; the extra trello-mcp board is a guest board in another organization). Card details and comments use one card with two comments. The board is private, so others cannot rerun on the same data. Official results reflect its hosted version on that date. Tool definitions are Claude tokens from /context; chars/4 would give about 5,146 for trello-mcp instead of 8,107.

Aggregate data. Method and harness. Percent fewer = round(100 * (1 - ours/theirs)); per-board values are rounded totals/count.

I use Trello with AI assistants a lot, so I built trello-mcp to make it lighter and easier to use.

A thought: with AI agents, managing context may be one of the main optimizations we need to make now. Every tool definition and response a model reads takes space from the actual task, and as context grows, output quality tends to drop.

Features checked 2026-10-17.

Feature	trello-mcp	Official	Node 1.8.1
Runs	Local binary	Hosted, OAuth	Local, Node or Bun
Guest boards	Yes	Not reached in the owner's check, 2026-10-16	Yes
Delete comments	Yes	No: list, add, edit	Yes
Create, update, delete labels	Yes	No: list, attach, detach	Yes
Attachments	Upload and download to disk, opt-in, Unix	Listing only	Any local path upload, inline base64 download
Per-object workspace allowlist	Yes	Per-workspace OAuth consent	Listing and some workspace operations
Server-side read-only mode	Yes	n/a (hosted)	Not documented

Choose official for zero install, web and mobile, Inbox, Planner or keyword search.

Read-oriented profile

Ten read tools (placement; board_use sets the local default board):

text

TRELLO_TOOLS=workspace_find,board_find,board_use,list_find,card_find,card_get,comment_find,checklist_get,checklist_items,server_health

TRELLO_TOOLS=workspace_find,board_find,board_use,list_find,card_find,card_get,comment_find,checklist_get,checklist_items,server_health

Synthetic reference

Synthetic fixtures versus raw Trello JSON for the same objects, regenerated by go test ./internal/bench -update.

Scenario	Raw Trello JSON	this server	reduction
20 boards	~2166	~433	80.0%
30 cards in a list	~9266	~2968	68.0%
20 comments	~6739	~4311	36.0%
50 board actions	~11910	~4248	64.3%
22 card actions	~4888	~1368	72.0%
Card with 20 comments	~7404	~4465	39.7%

Synthetic raw pretty JSON is a reproducible reference, not measured output from another MCP server. Tokens use chars/4.

Startup cost	Default (48 tools)	Read-oriented discovery (10 tools)
tools/list	20694 chars (~5174 tokens)	4400 chars (~1100 tokens)
Initialize instructions	140 chars (~35 tokens)	141 chars (~35 tokens)
Initialize result (including instructions)	304 chars (~76 tokens)	305 chars (~76 tokens)

Independent response	Characters	Tokens (chars/4)
card_find summary (30 cards)	11873	~2968
card_find full (30 cards)	15023	~3756
board_activity all (50 actions)	16994	~4248
board_activity commentCard	5835	~1459
board_activity updateCard	5476	~1369

Docs

Setup · Configuration and security · Tools

License

GPL-3.0-or-later, copyright Mert Dede (MIT up to v0.5.0). Independent Go implementation of the delorenj/mcp-server-trello 1.8.1 (MIT) tool surface, not a runtime dependency. Trello is a trademark of Atlassian. trello-mcp is an independent project, not affiliated with or endorsed by Atlassian.

Source: README.md at commit 302e87b

Tools

SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

v1.0.6LatestOct 29, 2026
v1.0.5Oct 22, 2026
v1.0.4Oct 18, 2026
v1.0.3Oct 17, 2026
v1.0.2Oct 16, 2026
v1.0.1Oct 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 days25 pts
Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.
Auth declared10 pts
Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts