Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
PlanExe
Overview
Description from the maker (original English)
MCP server for generating rough-draft project plans from natural-language prompts.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
- You need to fill in: X-API-Key
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- You fill in yourself:
X-API-Key
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Run this in your terminal
claude mcp add --transport http planexe https://mcp.planexe.org/mcp --header 'X-API-Key: your-value'Fill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"planexe": {
"url": "https://mcp.planexe.org/mcp",
"headers": {
"X-API-Key": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"planexe": {
"type": "http",
"url": "https://mcp.planexe.org/mcp",
"headers": {
"X-API-Key": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
X-API-Keysecret required HTTP headerPlanExe API key (UserApiKey from home.planexe.org, usually prefixed pex_).
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account PlanExeOrg, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Otheri
- More stars than 0% of the other 32537 servers in this category
- Published to the registry more recently than 2% of the other 32537 servers in this category
- Basic checks equal to or better than 100% of the other 32537 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is PlanExe safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
You need to fill in: X-API-Key
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 9 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, TF Rooms
Alternatives
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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Planning complex projects should not require a consulting-firm budget.
[!IMPORTANT]
PlanExe v2 is here, and it is better than v1.
This repository is PlanExe v1. For new plans, use
Turn a complex project brief into an editable planning baseline in roughly 65–90 minutes.
PlanExe v2 | See example plans
Why PlanExe exists
Good ideas are not limited to people and organizations that can afford a large consulting engagement. Turning an ambitious idea into a coherent project, however, normally requires substantial time, specialist knowledge, stakeholder interviews, and repeated synthesis.
PlanExe is open-source software for people and AI agents that need to plan complex projects. Describe a project in plain language and PlanExe creates a structured first-pass plan: the assumptions to challenge, decisions to make, work to coordinate, risks to investigate, and questions that must be answered before execution.
The result is not a substitute for stakeholder participation or professional sign-off. It is a way to begin with a broad, inspectable planning baseline instead of a blank page.
What PlanExe does
PlanExe examines a project from several planning perspectives and combines the results into one self-contained interactive report. Depending on the project, the output commonly includes:
- Executive summary and project purpose
- Assumptions, constraints, and unanswered questions
- Strategic choices and alternative scenarios
- Work breakdown structure and dependency-aware Gantt chart
- Governance bodies, decision rights, and escalation paths
- Roles, stakeholders, and engagement approaches
- Risk register, SWOT analysis, and mitigation proposals
- Premortem, expert criticism, premise attack, and self-audit
- Documents to create, documents to find, and data to collect
- An editable bundle of Markdown, JSON, and CSV source artifacts
PlanExe v2 runs on your own machine and makes its model calls through the Claude Code CLI, using your Claude subscription.
Built for complex projects
PlanExe is intended for consulting-scale, multi-phase initiatives—not everyday task lists or small personal projects.
Examples of suitable work include:
- Planning a regional clean-water, energy, or transport infrastructure program
- Coordinating a regulated healthcare or financial-services transformation
- Designing a cross-border public-sector initiative
- Preparing a complex business, industrial, or technology program
- Structuring an ERP migration, corporate separation, or post-merger integration
- Helping an under-resourced organization develop an ambitious proposal before it has access to specialist advisers
The richer the brief—objective, location, constraints, stakeholders, resources, timeline, and success criteria—the more useful the resulting plan becomes.
A plan you can inspect and change
PlanExe does not hide the planning process inside a chat transcript. Each run produces a folder of readable source artifacts alongside the final report.
If you find an assumption or early decision you disagree with, you can edit that artifact and continue the plan from there. PlanExe rebuilds the later work that depends on your change while preserving earlier work you already accept. This makes it possible to refine the reasoning behind a plan, not merely rewrite its final prose.
What PlanExe does not replace
PlanExe creates a draft for investigation and refinement. Generated claims, budgets, dates, laws, engineering assumptions, and risk estimates may be wrong or incomplete. Important projects still require:
- Evidence and current local data
- Stakeholder interviews and negotiation
- Domain experts and professional judgment
- Legal, financial, medical, safety, or engineering review where applicable
- Named people who take responsibility for decisions and execution
Use the report to expose assumptions, focus conversations, and accelerate planning—not as proof that a project is safe, feasible, funded, or approved.
See a plan, then generate one
- Browse plans generated by PlanExe and open any report that interests you.
- Generate your own plan with PlanExe v2.
Why run PlanExe on your own machine?
PlanExe v2 is a small Python program that you clone and run yourself. There is no hosted service and no PlanExe account. Running it locally lets you:
- Keep every generated plan as files on your own disk
- Edit any intermediate file and regenerate only the work that depends on it
- Resume an interrupted run without repeating the work already finished
- Read the log of every prompt and response behind the report
- Get started with nothing more than Python 3.11 and the Claude Code CLI
PlanExe v2 sends your project brief and the intermediate planning material to Anthropic through the Claude Code CLI. Do not use it for material that must not leave systems you control.
Running PlanExe yourself does not remove your legal, ethical, security, or professional responsibilities.
For setup instructions, see the PlanExe v2 repository.