DevPlan MCP Server

DevPlan MCP Server

Transform ideas into executable development plans — an MCP server that brings the ClaudeCode-DevPlanBuilder methodology to Claude Code.

The Problem: AI coding assistants often lose context, skip steps, or produce inconsistent code across sessions.

The Solution: DevPlan creates detailed, agent-executable development plans with built-in validation, lessons learned, and inline git workflows.

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NEW — Install as a Skill (No MCP Server Required)

DevPlan is now available as a standalone Claude Code skill — no MCP server, no network dependency, no SSE timeouts. The entire DevPlan methodology runs locally as a first-class plugin.

Install

Step 1 — Add this repo as a plugin marketplace:

/plugin marketplace add mmorris35/devplan-mcp-server

Step 2 — Install the plugin at user scope (available across all projects):

/plugin install devplan@mmorris35 --scope user

Step 3 — Reload plugins to activate:

/reload-plugins

Usage

Invoke the skill directly:

/devplan

Or use specific sub-commands:

/devplan brief          — Create or parse a PROJECT_BRIEF.md

/devplan plan — Generate a Haiku-executable DEVELOPMENT_PLAN.md /devplan agents — Generate executor (Haiku) and verifier (Sonnet) agents /devplan claude-md — Generate a project CLAUDE.md /devplan validate — Check plan structure and Haiku-executability /devplan progress — Show completion status /devplan export mermaid — Generate a Mermaid flowchart of the plan /devplan issue — Convert a GitHub issue to a remediation task /devplan implement — Kickoff the build with executor + verifier agents

Or just describe what you need — Claude will invoke the skill automatically:

"Help me plan a CLI tool for managing dotfiles"

"Create a development plan for this project" "Validate my development plan"

What's Included

skills/devplan/

├── SKILL.md — Core methodology, interview flow, dispatch ├── references/ │ ├── templates.md — Brief/plan/CLAUDE.md templates (CLI, web app, API, library) │ ├── validation.md — Structure + Haiku-executability rules + battle-tested lessons │ ├── agents.md — Executor and verifier agent generation patterns │ └── workflows.md — Mermaid/ReactFlow export + progress tracking ├── scripts/ │ ├── validate-plan.sh — Structural validation (standalone) │ └── check-haiku.sh — Haiku-executability checker (standalone) └── examples/ └── hello-cli-plan.md — Gold standard reference plan

Skill vs MCP Server

Both options are fully supported. The skill is recommended for reliability; the MCP server adds the lessons learned system and usage analytics.

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Key Features

Install

claude mcp add devplan --transport sse https://mcp.devplanmcp.store/sse --scope user

Or add to ~/.claude.json under the mcpServers key:

{

"mcpServers": { "devplan": { "type": "sse", "url": "https://mcp.devplanmcp.store/sse" } } }

Update Existing Installation

If you already have DevPlan installed, remove from both scopes and re-add:

claude mcp remove devplan --scope project; claude mcp remove devplan --scope user; claude mcp add devplan --transport sse https://mcp.devplanmcp.store/sse --scope user

Quick Start

You: "Use devplan_start to help me build a CLI tool for managing dotfiles"

That's it. DevPlan will guide Claude through the entire process.

The DevPlan Workflow

DevPlan uses a scaffold → enhance → validate workflow that ensures every plan is agent-executable before implementation begins.

flowchart LR

subgraph Planning["📋 Planning"] A[Interview] --> B[Brief] B --> C[Generate Scaffold] end

subgraph Enhancement["✨ Enhancement"] C --> D[Enhance with Code] D --> E{Validate} E -->|Fail| D E -->|Pass| F[Ready] end

subgraph Execution["⚡ Execution"] F --> G[Agent Executes] G --> H[Agent Verifies] end

subgraph Learning["🧠 Learning"] H -->|issues| I[Capture Lessons] I -->|improve| C end

style E fill:#fff3e0,stroke:#f57c00 style F fill:#c8e6c9,stroke:#2e7d32 style I fill:#e3f2fd,stroke:#1565c0

How It Works

1. Interview → DevPlan asks questions to understand your project
2. Brief → Creates a structured PROJECT_BRIEF.md with requirements
3. Generate Scaffold → devplan_generate_plan creates foundation phases + a feature list
4. Enhance with Code → Your AI agent structures feature phases and fills in complete, copy-pasteable code
5. Validate → devplan_validate_plan checks the plan is agent-executable
6. Execute → Executor agent implements each subtask with inline git commands
7. Verify → Verifier agent tries to break the implementation
8. Learn → Issues become lessons for future projects

Validation Ensures Quality

The validation step checks that plans are truly executable:

• ✅ Complete code blocks (not pseudocode or placeholders)
• ✅ All imports included in code blocks
• ✅ No "add to existing" instructions
• ✅ No cross-subtask references
• ✅ Verification commands with expected outputs

# Example validation output

{ "valid": true, "errors": [], "warnings": [], "stats": { "subtasks": 5, "codeBlocksChecked": 8, "issuesFound": 0 } }

Real-Time Progress with Task Tools

Generated executor and verifier agents integrate with Claude Code's Task tools for live progress visibility:

• Executor agents create tasks for each subtask, showing real-time spinners as work progresses
• Verifier agents create tasks for each verification phase (Smoke Tests, Feature Verification, Edge Cases, etc.)
• Progress is visible without scrolling — you always know what Claude is working on

# Example: Executor tracks subtasks

TaskCreate({ subject: "1.2.3: Implement auth middleware", activeForm: "Implementing auth middleware" }) TaskUpdate({ taskId: "...", status: "in_progress" })

... work happens ...

TaskUpdate({ taskId: "...", status: "completed" })

Both Task tools (real-time visibility) and DEVELOPMENT_PLAN.md (durable record) are updated — giving you the best of both worlds.

Usage Examples

New Project

"Use devplan_start to help me build [your idea]"

Fix a GitHub Issue

# Get issue JSON

gh issue view 123 --json number,title,body,labels,comments,url > issue.json

Then tell Claude:

"Use devplan_issue_to_task with this issue to create a remediation plan"

Check Progress

"Use devplan_progress_summary to show me where we are"

Multi-Model Support

DevPlan generates plans and agent files for multiple AI coding tools and models. Use the target parameter to generate outputs for your preferred tool.

Supported Targets

Using Targets

When generating plans or agent files, specify the target tool:

Generate plan for Cursor:

"Use devplan_generate_plan to create a plan, then I'll customize it for Cursor. Set target to 'cursor' for .cursorrules format"

Generate executor for Aider:

"Use devplan_generate_executor with target='aider' to create an Aider-compatible executor agent"

Generate generic agent files:

"Use devplan_generate_claude_md with target='generic' to create model-agnostic AGENTS.md files"

How Targets Work

Each target has a dedicated adapter that transforms the DevPlan methodology into the appropriate format:

• Claude - Generates CLAUDE.md with executor/verifier agents in .claude/agents/
• Cursor - Generates .cursorrules with all guidance in one file (Cursor doesn't support separate agents)
• Aider - Generates .aider.conf.yml with architect mode instructions
• Cline - Generates .cline/instructions.md with executor/verifier split
• Windsurf - Generates .windsurf/rules.md with cascade-optimized format
• Generic - Generates AGENTS.md, EXECUTOR.md, and VERIFIER.md for any tool

Examples

Start a new project for Cursor:

"Use devplan_start to help me build a CLI tool, then generate the plan with target='cursor' for Cursor IDE"

Add executor for specific target:

"I have a development plan. Use devplan_generate_executor with target='aider' to create the executor agent for Aider"

Compare adapter capabilities: See docs/ADAPTERS.md for a detailed comparison of each target's capabilities and limitations.

Tools

Planning

Generation

Validation & Execution

Lessons Learned

Feedback loop that captures issues from verification and incorporates them into future plans.

| devplan_add_lesson | Capture a lesson fr