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Agent skill

Bmad Checkpoint Preview

by delorenj in delorenj/mcp-server-trello

LLM-assisted human-in-the-loop review. An agent skill from delorenj/mcp-server-trello.

MITAuto-check passedAgent Workflows

Install Bmad Checkpoint Preview

skills CLI
$ npx skills add delorenj/mcp-server-trello --skill bmad-checkpoint-preview -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install delorenj/mcp-server-trello bmad-checkpoint-preview --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/delorenj/mcp-server-trello.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agent/skills/bmad-checkpoint-preview .claude/skills/bmad-checkpoint-preview && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
bmad-checkpoint-preview
GitHub stars
445
Used in
3 other repos
Token cost
~786 tokens
SKILL.md length
349 words
Files
8
Skills in repo
64
Repo updated
First seen
Licence
MIT

At a glance

LLM-assisted human-in-the-loop review. An agent skill from delorenj/mcp-server-trello.

  • Works in 6 steps: Resolve the Workflow Block → Execute Prepend Steps → Load Persistent Facts → …
  • The user says checkpoint
  • SKILL.md covers Conventions, On Activation, Global Step Rules (apply to… and FIRST STEP
  • Calls python3

What it does

Bmad Checkpoint Preview is an agent skill from delorenj/mcp-server-trello. LLM-assisted human-in-the-loop review. Make sense of a change, focus attention where it matters, test. Use when the user says "checkpoint", "human review", or "walk me through this change".

Its SKILL.md is about 790 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files (for example `generate-trail.md`, `step-01-orientation.md` and `step-02-walkthrough.md`).

It sits in Agent Workflows, covering Human-in-the-loop approvals. The repository describes itself as: A Model Context Protocol (MCP) server that provides tools for interacting with Trello boards. The licence is MIT.

When your agent uses it

  • The user says checkpoint
  • Walk me through this change

Example prompts

  • “checkpoint”
  • “human review”
  • “walk me through this change”
  • “/bmad-checkpoint-preview”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Resolve the Workflow Block
  2. Execute Prepend Steps
  3. Load Persistent Facts
  4. Load Config
  5. Greet the User
  6. Execute Append Steps

What it can do on your machine

Read from SKILL.md and the folder at commit 737292f. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python3

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Bmad Checkpoint Preview loads about 786 tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 349 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~53
When it runs · the whole SKILL.md, loaded when a task matches
~786

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from delorenj/mcp-server-trello at commit 737292f, republished under its MIT licence (© delorenj). 349 words, ~786 tokens.

Download SKILL.mdSave it as .claude/skills/bmad-checkpoint-preview/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
bmad-checkpoint-preview
description
LLM-assisted human-in-the-loop review. Make sense of a change, focus attention where it matters, test. Use when the user says "checkpoint", "human review", or "walk me through this change".

Checkpoint Review Workflow

Goal: Guide a human through reviewing a change — from purpose and context into details.

Your Role: You are assisting the user in reviewing a change.

Conventions

  • Bare paths (e.g. step-01-orientation.md) resolve from the skill root.
  • {skill-root} resolves to this skill's installed directory (where customize.toml lives).
  • {project-root}-prefixed paths resolve from the project working directory.
  • {skill-name} resolves to the skill directory's basename.

On Activation

Step 1: Resolve the Workflow Block

Run: python3 {project-root}/_bmad/scripts/resolve_customization.py --skill {skill-root} --key workflow

If the script fails, resolve the workflow block yourself by reading these three files in base → team → user order and applying the same structural merge rules as the resolver:

  1. {skill-root}/customize.toml — defaults
  2. {project-root}/_bmad/custom/{skill-name}.toml — team overrides
  3. {project-root}/_bmad/custom/{skill-name}.user.toml — personal overrides

Any missing file is skipped. Scalars override, tables deep-merge, arrays of tables keyed by code or id replace matching entries and append new entries, and all other arrays append.

Step 2: Execute Prepend Steps

Execute each entry in {workflow.activation_steps_prepend} in order before proceeding.

Step 3: Load Persistent Facts

Treat every entry in {workflow.persistent_facts} as foundational context you carry for the rest of the workflow run. Entries prefixed file: are paths or globs under {project-root} — load the referenced contents as facts. All other entries are facts verbatim.

Step 4: Load Config

Load config from {project-root}/_bmad/bmm/config.yaml and resolve:

  • implementation_artifacts
  • planning_artifacts
  • communication_language
  • document_output_language
Step 5: Greet the User

Greet the user, speaking in {communication_language}.

Step 6: Execute Append Steps

Execute each entry in {workflow.activation_steps_append} in order.

Activation is complete. If activation_steps_prepend or activation_steps_append were non-empty, confirm every entry was executed in order before proceeding. Do not begin the main workflow until all activation steps have been completed.

Global Step Rules (apply to every step)

  • Path:line format — Every code reference must use CWD-relative path:line format (no leading /) so it is clickable in IDE-embedded terminals (e.g., src/auth/middleware.ts:42).
  • Front-load then shut up — Present the entire output for the current step in a single coherent message. Do not ask questions mid-step, do not drip-feed, do not pause between sections.
  • Language — Speak in {communication_language}. Write any file output in {document_output_language}.

FIRST STEP

Read fully and follow ./step-01-orientation.md to begin.

© delorenj, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 7 other files in .agent/skills/bmad-checkpoint-preview of delorenj/mcp-server-trello.

  • SKILL.md
  • customize.toml
  • generate-trail.md
  • step-01-orientation.md
  • step-02-walkthrough.md
  • step-03-detail-pass.md
  • step-04-testing.md
  • step-05-wrapup.md

Open the folder on GitHubat commit 737292f

Used in 3 other repositories

We found 8 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in delorenj/mcp-server-trello, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Bmad Checkpoint Preview next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Bmad Checkpoint Preview compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Bmad Checkpoint Preview this skilldelorenj/mcp-server-trello4453 repos~786Automated safety check: PassMIT
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Darwin Skill Optimizeralchaincyf/darwin-skill6.2k1 repos~4.7kAutomated safety check: PassMIT
Loop Constraints Enforcercobusgreyling/loop-engineering11k1 repos~475Automated safety check: NotesMIT
Ask User QuestionMemTensor/MemOS12k—~1kAutomated safety check: PassApache-2.0
PUA High-Agency Governancetanweai/pua20k—~502Automated safety check: PassMIT

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Categories

Questions about Bmad Checkpoint Preview

What does Bmad Checkpoint Preview do?

LLM-assisted human-in-the-loop review. An agent skill from delorenj/mcp-server-trello. Bmad Checkpoint Preview is an agent skill from delorenj/mcp-server-trello. LLM-assisted human-in-the-loop review.

When should I use Bmad Checkpoint Preview?

Bmad Checkpoint Preview fits situations like: the user says checkpoint; walk me through this change.

How do I install Bmad Checkpoint Preview in Claude Code?

Run `npx skills add delorenj/mcp-server-trello --skill bmad-checkpoint-preview -a claude-code`. Or copy the skill folder (.agent/skills/bmad-checkpoint-preview in delorenj/mcp-server-trello) into .claude/skills/bmad-checkpoint-preview in your project. Claude Code loads it when a task matches its description.

How do I install Bmad Checkpoint Preview in Codex?

Run `npx skills add delorenj/mcp-server-trello --skill bmad-checkpoint-preview -a codex`. Or copy the skill folder (.agent/skills/bmad-checkpoint-preview in delorenj/mcp-server-trello) into .agents/skills/bmad-checkpoint-preview in your project. Codex loads it when a task matches its description.

Can I use Bmad Checkpoint Preview in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add delorenj/mcp-server-trello --skill bmad-checkpoint-preview -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/bmad-checkpoint-preview, .gemini/skills/bmad-checkpoint-preview, .github/skills/bmad-checkpoint-preview and .opencode/skills/bmad-checkpoint-preview in your project.

What does Bmad Checkpoint Preview need to run?

Going by SKILL.md and its folder, Bmad Checkpoint Preview needs the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Bmad Checkpoint Preview access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Bmad Checkpoint Preview safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Bmad Checkpoint Preview use?

Bmad Checkpoint Preview is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Bmad Checkpoint Preview use?

About 786 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Bmad Checkpoint Preview?

Skills that share tags, products or a category with Bmad Checkpoint Preview: Show Me Your Work Decision Log (cursor/plugins, 11k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Loop Constraints Enforcer (cobusgreyling/loop-engineering, 11k stars) and Ask User Question (MemTensor/MemOS, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Bmad Checkpoint Preview?

delorenj (a GitHub user) maintains it in delorenj/mcp-server-trello, which has 445 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on September 23, 2026.

Source: delorenj/mcp-server-trello on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.