What is mcp-server-trello?

A connection between a coding agent and Trello, a tool for organizing work on boards and cards. It supports board discovery and card-related workflows through a local server.

Use it to find boards, manage cards and checklists, add comments or attachments, handle labels and members, and monitor server health.

It lets an agent inspect and manage Trello work without switching between separate tools.

mcp-server-trello — Skill for Claude Code and Codex by delorenj

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add delorenj/mcp-server-trello --skill skill

Clone the repo

git clone --depth 1 https://github.com/delorenj/mcp-server-trello

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/delorenj/mcp-server-trello/skill/github.svg)](https://agentmods.dev/skills/delorenj/mcp-server-trello/skill)

Your own site

<a href="https://agentmods.dev/skills/delorenj/mcp-server-trello/skill"><img src="https://agentmods.dev/badge/skills/delorenj/mcp-server-trello/skill/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/delorenj/mcp-server-trello/skill"><img src="https://agentmods.dev/badge/skills/delorenj/mcp-server-trello/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 858 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00051	$0.00858
Opus 5.5	$0.00020	$0.00343
Sonnet 5.5	$0.00010	$0.00172
Haiku 4.5	$0.00005	$0.00086

Measured 1mo ago against content hash f180e2cb513d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-server-trello scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 12 executable files (assets/source/src/card-list-preview.ts, assets/source/src/evals/evals.ts, assets/source/src/health/health-endpoints.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skill/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Trello MCP Server Skill

Use this skill when an agent needs to inspect or manage Trello boards through the bundled MCP server. The skill carries its own server source in assets/source/ and installs it locally on first use.

Activation

Before using Trello tools, verify that the local server has been installed.

Check for a built server at: {XDG_DATA_HOME:-$HOME/.local/share}/mcp-server-trello-skill/server/build/index.js
If it is missing, run: bash {skill-root}/scripts/install.sh
Confirm the MCP client has TRELLO_API_KEY and TRELLO_TOKEN configured. Optional values are TRELLO_BOARD_ID, TRELLO_WORKSPACE_ID, https_proxy, and HTTPS_PROXY.

The install script builds from assets/source/ when Bun is available. If Bun is not available, it falls back to the published package install path and creates a local wrapper at the same build/index.js check path.

Reading Order

Load only the reference needed for the current Trello task.

Start with references/trello-mcp/README.md for routing.
Use references/trello-mcp/configuration.md for authentication, install, and client setup.
Use references/trello-mcp/api.md when you need tool names and parameters.
Use references/trello-mcp/patterns.md for common board, card, checklist, and attachment workflows.
Use references/trello-mcp/gotchas.md for date formats, IDs, rate limits, and recovery steps.

Tool Routing

Choose tools by workflow, not by guessing IDs.

Board discovery: list_boards, set_active_board, get_active_board_info, list_workspaces, set_active_workspace, list_boards_in_workspace.
Lists and cards: get_lists, get_cards_by_list_id, get_card, add_card_to_list, update_card_details, move_card, archive_card, copy_card, add_cards_to_list, get_my_cards, get_card_history.
Checklists: create_checklist, get_checklist_items, add_checklist_item, find_checklist_items_by_description, get_acceptance_criteria, get_checklist_by_name, update_checklist_item, delete_checklist_item, copy_checklist.
Comments: add_comment, update_comment, delete_comment, get_card_comments.
Attachments: attach_image_to_card, attach_file_to_card, attach_image_data_to_card, download_attachment.
Labels and members: get_board_labels, create_label, update_label, delete_label, get_board_members, assign_member_to_card, remove_member_from_card.
Health: get_health, get_health_detailed, get_health_metadata, get_health_performance, perform_system_repair.

Read the full file on GitHub · 77 lines

Files

What ships with it

22 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 77 lines · 51 tokens per session scan A f180e2cb513d

Subscribe to this mod's changes

mcp-server-trello is a skill published in the GitHub repository delorenj/mcp-server-trello (447 stars, last pushed 9d ago), licensed MIT. It adds 51 tokens to every session and 858 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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