Agent skill

MCP Developer

A skill your agent uses when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration.

MITAuto-check passedAgent Workflows

Install MCP Developer

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a claude-code

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

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer --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/leehack/mcp_dart.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .claude/skills/mcp-developer && 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/

Paste into Claude Code

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .claude/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/leehack/mcp_dart.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .agents/skills/mcp-developer && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .agents/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/leehack/mcp_dart.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .cursor/skills/mcp-developer && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .cursor/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/leehack/mcp_dart.git --path packages/mcp_dart_cli/lib/src/skills/mcp-developer

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/leehack/mcp_dart.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .gemini/skills/mcp-developer && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .gemini/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/leehack/mcp_dart.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .github/skills/mcp-developer && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .github/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add leehack/mcp_dart --skill mcp-developer -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install leehack/mcp_dart mcp-developer --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/leehack/mcp_dart.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/mcp_dart_cli/lib/src/skills/mcp-developer .opencode/skills/mcp-developer && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "mcp-developer" agent skill from https://github.com/leehack/mcp_dart/tree/main/packages/mcp_dart_cli/lib/src/skills/mcp-developer into .opencode/skills/mcp-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-developer", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: mcp-developer
GitHub stars: 116
Token cost: ~770 tokens
SKILL.md length: 381 words
Files: 1
Skills in repo: 4
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration.

Works in 9 steps: Identify the transport first: stdio,… → Preserve wire-level MCP semantics. Keep… → Check advertised capabilities before… → …
Reviewing Model Context Protocol servers
SKILL.md covers Workflow, Host Configuration Checks and Release And Install Checks
Calls dart

What it does

MCP Developer is an agent skill from leehack/mcp_dart. Use when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration.

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering MCP servers and Debugging. It works with Model Context Protocol and Dart. The repository describes itself as: Dart implementation of MCP SDK. The licence is MIT.

When your agent uses it

Reviewing Model Context Protocol servers
Agent host configuration

Example prompts

“/mcp-developer”

Requirements

Python 3

Workflow steps

9 steps, taken from the first numbered list in SKILL.md.

Identify the transport first: stdio, Streamable HTTP, SSE, or a host-specific adapter.
Preserve wire-level MCP semantics. Keep JSON-RPC ids, method names, capability flags, metadata, and error codes in their original…
Check advertised capabilities before calling capability-specific methods.
Reproduce with a protocol-level tool before editing app code
Use --probe-config with inspect-server when a server needs real tool arguments, resource URIs, prompt arguments, completion values, or…
Treat inspect-server, inspect-client, and trace as the live debugging workflow. They return protocol checks or traffic evidence for real…
If changing this Dart SDK/CLI package itself, also run mcp_dart conformance --suite all --json for the built-in protocol regression…
For cross-language issues, test at least one non-Dart peer. Prefer the official TypeScript or Python MCP SDK when a reproduction can be…
When changing protocol behavior, add regression coverage for the raw wire shape or interop edge case, not only a convenience API test.

What it can do on your machine

Read from SKILL.md and the folder at commit 69ffef3. 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:
- dart
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

MCP Developer loads about 770 tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 381 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~44
When it runs · the whole SKILL.md, loaded when a task matches: ~770

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 leehack/mcp_dart at commit 69ffef3, republished under its MIT licence (© leehack). 381 words, ~770 tokens.

Download SKILL.mdSave it as .claude/skills/mcp-developer/SKILL.md (or your agent's skills folder).

name: mcp-developer
description: Use when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration.

MCP Developer

Use this skill when the work involves MCP protocol behavior, cross-SDK interop, server/client debugging, or host configuration.

Workflow

Identify the transport first: stdio, Streamable HTTP, SSE, or a host-specific adapter.
Preserve wire-level MCP semantics. Keep JSON-RPC ids, method names, capability flags, metadata, and error codes in their original spec-compatible shape.
Check advertised capabilities before calling capability-specific methods.
Reproduce with a protocol-level tool before editing app code:
- mcp_dart inspect-server --json -- <server-command> ...
- Configure a client/agent host to launch mcp_dart inspect-client --report /tmp/mcp-client-report.json
- Configure a client/agent host to launch mcp_dart trace --report /tmp/mcp-trace.json -- <real-server-command> ...
- mcp_dart list-tools -- <server-command> ...
- mcp_dart call-tool <tool> --json-args '{"key":"value"}' -- <server-command> ...
- mcp_dart inspect --url http://localhost:3000/mcp
Use --probe-config with inspect-server when a server needs real tool arguments, resource URIs, prompt arguments, completion values, or task behavior. Keep destructive app actions out of default probes.
Treat inspect-server, inspect-client, and trace as the live debugging workflow. They return protocol checks or traffic evidence for real targets; there is no separate live validation command to prefer.
If changing this Dart SDK/CLI package itself, also run mcp_dart conformance --suite all --json for the built-in protocol regression fixtures.
For cross-language issues, test at least one non-Dart peer. Prefer the official TypeScript or Python MCP SDK when a reproduction can be made small, and use published servers such as filesystem/time when the bug depends on real package behavior.
When changing protocol behavior, add regression coverage for the raw wire shape or interop edge case, not only a convenience API test.

Show full SKILL.md (128 more words)Show less

Host Configuration Checks

Confirm the host launches the exact command and arguments you tested manually.
Keep secrets in environment variables or host secret stores, not generated config files.
Avoid printing diagnostic text to stdout for stdio servers; stdout is reserved for JSON-RPC frames.
Use inspect-client --report <path> for agent hosts or clients that need a disposable MCP server to connect to.
Record the MCP protocol version, SDK/package version, and transport in issue notes.

Release And Install Checks

If the CLI is needed on machines without Dart, use the GitHub release binary.
Use mcp_dart update for normal upgrades. For manual installs, rerun the installer command against the same install directory.
Before recommending a release, verify dart analyze, focused tests, and any TypeScript/Python interop smoke tests affected by the change.

Files

Just SKILL.md in packages/mcp_dart_cli/lib/src/skills/mcp-developer of leehack/mcp_dart.

Open the folder on GitHubat commit 69ffef3

Compare with similar skills

MCP Developer 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.

MCP Developer compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
MCP Developer this skillleehack/mcp_dart	116	—	~770	Automated safety check: Pass	MIT	2 days ago
Local DevSmilyOrg/photofield	608	—	~2.4k	Automated safety check: Pass	MIT	1 mo ago
Embedded DebuggerAdancurusul/embedded-debugger-mcp	199	—	~1.4k	Automated safety check: Pass	MIT	2 mo ago
Memorywhalewuisabel-gif/MemWhale	151	—	~765	Automated safety check: Pass	MIT	yesterday
Helmor Debug Operatedohooo/helmor	1.3k	—	~6.6k	Automated safety check: Pass	Apache-2.0	1 mo ago
MCP Inspectoradeze/raindrop-mcp	188	—	~421	Automated safety check: Pass	MIT	2 mo ago

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Works with

Questions about MCP Developer

What does MCP Developer do?

A skill your agent uses when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration. MCP Developer is an agent skill from leehack/mcp_dart. Use when building, testing, debugging, or reviewing Model Context Protocol servers, clients, transports, tools, resources, prompts, and agent host configuration.

When should I use MCP Developer?

MCP Developer fits situations like: reviewing Model Context Protocol servers; agent host configuration.

How do I install MCP Developer in Claude Code?

Run `npx skills add leehack/mcp_dart --skill mcp-developer -a claude-code`. Or copy the skill folder (packages/mcp_dart_cli/lib/src/skills/mcp-developer in leehack/mcp_dart) into .claude/skills/mcp-developer in your project. Claude Code loads it when a task matches its description.

How do I install MCP Developer in Codex?

Run `npx skills add leehack/mcp_dart --skill mcp-developer -a codex`. Or copy the skill folder (packages/mcp_dart_cli/lib/src/skills/mcp-developer in leehack/mcp_dart) into .agents/skills/mcp-developer in your project. Codex loads it when a task matches its description.

Can I use MCP Developer 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 leehack/mcp_dart --skill mcp-developer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mcp-developer, .gemini/skills/mcp-developer, .github/skills/mcp-developer and .opencode/skills/mcp-developer in your project.

What does MCP Developer need to run?

Going by SKILL.md and its folder, MCP Developer needs the command-line tools its instructions call (dart). Our summary lists: Python 3.

Does MCP Developer 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 MCP Developer 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 MCP Developer use?

MCP Developer 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 MCP Developer use?

About 770 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 MCP Developer?

Skills that share tags, products or a category with MCP Developer: Local Dev (SmilyOrg/photofield, 608 stars), Embedded Debugger (Adancurusul/embedded-debugger-mcp, 199 stars), Memorywhale (wuisabel-gif/MemWhale, 151 stars) and Helmor Debug Operate (dohooo/helmor, 1.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains MCP Developer?

leehack (a GitHub user) maintains it in leehack/mcp_dart, which has 116 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 5, 2026.

Source: leehack/mcp_dart on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install MCP Developer

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

MCP Developer

Workflow

Host Configuration Checks

Release And Install Checks

Files

Compare with similar skills

Similar skills

More from leehack/mcp_dart

Related

Questions about MCP Developer