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.

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:

bash

/plugin marketplace add mmorris35/devplan-mcp-server

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

bash

/plugin install devplan@mmorris35 --scope user

Step 3 — Reload plugins to activate:

bash

/reload-plugins

Usage

Invoke the skill directly:

Code

/devplan

Or use specific sub-commands:

server.ts

/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 <number> — 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:

Code

"Help me plan a CLI tool for managing dotfiles"
"Create a development plan for this project"
"Validate my development plan"

What's Included

server.ts

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

	Skill (NEW)	MCP Server
Network	None required	SSE connection to Cloudflare
Reliability	Always works	Subject to SSE timeouts
Lessons system	Use Nellie or your own	Built-in KV store
Install	`/plugin install`	`claude mcp add`
Validation scripts	Standalone bash	Server-side

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

Key Features

Feature	Description
Agent-Executable Plans	Plans so detailed that any LLM coding agent can execute them mechanically
Built-in Validation	Validates plans are complete before execution begins
Real-Time Progress Tracking	Integrates with Claude Code's Task tools for live visibility
Lessons Learned	Captures issues from verification and injects them into future plans
Issue Remediation	Converts GitHub issues directly into remediation tasks
Executor & Verifier Agents	Auto-generates specialized agents with task tracking built-in

Install

Terminal

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

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

config.json

{
  "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:

Terminal

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

Code

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.

mermaid

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

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

Code

# 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

Code

# 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

Code

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

Fix a GitHub Issue

bash

# 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

Code

"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

Target	Tool	Agent File	Best For
`claude`	Claude Code	`CLAUDE.md`	Claude Code IDE (default)
`cursor`	Cursor IDE	`.cursorrules`	Cursor AI editor
`aider`	Aider CLI	`.aider.conf.yml`	Terminal-based AI pair programming
`cline`	VS Code Cline	`.cline/instructions.md`	VS Code extension
`windsurf`	Windsurf IDE	`.windsurf/rules.md`	Codium's AI IDE
`generic`	Any Model	`AGENTS.md` + files	Model-agnostic markdown format

Using Targets

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

Generate plan for Cursor:

Code

"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:

Code

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

Generate generic agent files:

Code

"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:

Code

"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:

Code

"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

Tool	Purpose
`devplan_start`	Main entry point - guides Claude through the methodology
`devplan_interview_questions`	Get questions to gather project requirements
`devplan_create_brief`	Generate PROJECT_BRIEF.md
`devplan_parse_brief`	Parse existing brief into structured data
`devplan_list_templates`	List project templates (cli, web_app, api, library)

Generation

Tool	Purpose
`devplan_generate_plan`	Generate DEVELOPMENT_PLAN.md scaffold with validation instructions
`devplan_generate_claude_md`	Generate CLAUDE.md scaffold
`devplan_generate_executor`	Generate executor agent with Task tool integration
`devplan_generate_verifier`	Generate verifier agent with Task tool integration

Validation & Execution

Tool	Purpose
`devplan_validate_plan`	Validate plan structure and agent-executability
`devplan_get_subtask`	Get specific subtask details by ID
`devplan_update_progress`	Mark subtasks complete with notes
`devplan_progress_summary`	Get completion stats and next actions

Lessons Learned

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

Tool	Purpose
`devplan_add_lesson`	Capture a lesson from verifier findings
`devplan_list_lessons`	List accumulated lessons by severity
`devplan_archive_lesson`	Archive old lessons without deleting them
`devplan_delete_lesson`	Remove outdated or incorrect lessons
`devplan_extract_lessons_from_report`	Auto-extract lessons from verification reports

Issue Remediation

Convert GitHub issues into structured remediation tasks — perfect for bug fixes and post-release maintenance.

Tool	Purpose
`devplan_parse_issue`	Analyze a GitHub issue to extract requirements
`devplan_issue_to_task`	Generate remediation task with subtasks from an issue

Analytics

Tool	Purpose
`devplan_usage_stats`	View usage distribution across users

Why DevPlan?

Without DevPlan	With DevPlan
Context lost between sessions	Plans preserve full context
Inconsistent code quality	Executor agents follow exact specifications
Same mistakes repeated	Lessons learned system prevents recurrence
No verification step	Verifier agents actively try to break the code
Bugs found in production	Issues caught before release
Plans need interpretation	Validated plans are copy-paste ready

Dashboard & Analytics

DevPlan includes a public dashboard for viewing aggregate usage statistics:

Dashboard URL: devplanmcp.store/dashboard

The dashboard shows:

Summary cards: Total sessions, total tool calls, countries reached
Line chart: Sessions and tool calls over the last 30 days
Country table: Top 10 countries by session count

Privacy

All analytics are privacy-preserving:

No IP storage: Only Cloudflare-derived country/region codes
No user identification: Sessions are anonymous
Auto-expiration: Daily stats expire after 90 days via KV TTL

Development

Terminal

npm install
npm run dev      # Local development
npm run deploy   # Deploy to Cloudflare Workers

Contributing

Contributions welcome! Please see the ClaudeCode-DevPlanBuilder repo for methodology details.

License

MIT

Built for Claude Code
Model Context Protocol • Cloudflare Workers • DevPlanBuilder Methodology