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
Eigenstyle
Overview
Description from the maker (original English)
MCP server for a personal voice profile: corpus, fingerprint, and draft-checking tools.
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 on your computer
- Transport: stdio
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- The registry lists no key to fill in.
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Download the maker’s .mcpb file
The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.
Run this in your terminal
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.
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 one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
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 against the domain qompass.ai (the registry checks domain ownership)
- … 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 applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Otheri
- More stars than 0% of the other 32380 servers in this category
- Published to the registry more recently than 67% of the other 32380 servers in this category
- Basic checks equal to or better than 100% of the other 32380 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 Eigenstyle 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?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.1.1) reached the registry 18 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need MCPB on your computer.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Dechonet MCP
Alternatives
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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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Computer or cloudUpdated today
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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.
eigenstyle — your voice profile as a tool
A Rust workspace that turns a measured writing fingerprint (built 2026-10-11 in the matt-voice skill) into a living system: an MCP server agents can call, a terminal UI, and a GPUI desktop GUI — all over one core library, all fed by a corpus you keep adding to.
The fingerprint is *measured*, not vibes: sentence-length distribution, function-word profile, punctuation rates, parentheticals, hyphenated compounds, hedge/assertive balance, first-person rate — the same features, tokenizer, rounding, and leave-one-out band calibration as the skill's Python reference. A parity test suite proves the Rust engine reproduces the Python numbers on the seed corpus (features and bands identical; checker deltas on the held-out pieces match: JAS 1.196, Cureus 1.088, synthetic 1.253).
The three front-ends
| Front-end | Binary | Run it |
|---|---|---|
| MCP server (stdio) | eigenstyle | cargo run --release -p eigenstyle (add --home to choose the store) |
| Terminal UI | eigenstyle-tui | cargo run --release -p eigenstyle-tui |
| Desktop GUI | eigenstyle-gui | cargo run --release -p eigenstyle-gui (Wayland session) |
All three share one store: $EIGENSTYLE_HOME, else ~/.local/share/eigenstyle/. First open seeds it from the skill's corpus (6 pieces, 7,674 words), fingerprint, and readable profile.
MCP tools
| Tool | What it does |
|---|---|
check_draft | Score a draft (text or file): verdict CLOSE / DRIFTING / OFF-VOICE / UNRELIABLE, delta, top contributing features, avoid-list hits. With source_text/source_file_path, also accounts for every number and URL from the source — dropped numbers and dropped/broken URLs are reported. |
get_exemplars | Verbatim exemplar paragraphs from included samples of one genre (the retrieval bank agents draft against). |
get_profile | The readable profile + fingerprint summary (effective values, which are user-corrected), bands, avoid list. |
ingest_sample | Add writing (exactly one of text / file_path / url). Title, genre, and authorship (sole/blended) are required — attribution is never silently defaulted. Never recomputes the fingerprint. |
list_corpus | The corpus manifest: metadata, word counts, included flags, totals. |
recompute_fingerprint | Recompute from included samples and re-derive the bands. dry_run: true previews the induced feature deltas and band shifts without saving — review before you apply. |
Protocol: MCP over stdio on rmcp 3.8 (the official Rust MCP SDK), modern era only (protocol version 2026-07-28). Sessions open with server/discover and every request carries its protocol version in _meta — there is no initialize handshake. Legacy-era contact is refused at the stdio front door with the typed -32022 unsupported-version error. Fail-closed throughout: malformed frames, unknown tools, strict argument schemas, named size bounds everywhere.
Versions (1.0 release): the MCP server eigenstyle, the TUI, and the GUI are 1.0.0. eigenstyle-core stays at 0.1.0 — that version is already published on crates.io and does not move with this release.
Adding your writing
- MCP: an agent calls
ingest_sample(or you ask for a URL fetch — the core fetches it, bounded, HTML reduced to text). - TUI:
Add writingscreen (key2) — title, genre, authorship toggle, source, then a file path (Enter loads it) or pasted text; Ctrl+S saves. - GUI:
Add writingtab — same fields as clickable boxes; the authorship button toggles sole/blended; Add sample saves.
In every flow the same rules hold: samples are append-only (exclude a sample from the fingerprint instead of deleting history), and the fingerprint never changes silently — recompute is explicit, with a dry-run preview first.
Correcting the fingerprint
The fingerprint dashboard (TUI Fingerprint screen, GUI Fingerprint tab) lists every feature's mean/SD. Select one, type a corrected mean, apply: the value is stored as a *user correction* overlaid on the computed reference. Corrections survive recompute, are marked wherever they show, and can be cleared wholesale to restore computed values exactly.
Patterns adapted from same-kind tools
- HumanifyMe — the editable, human-readable fingerprint, and the deterministic post-draft verify gate (dropped numbers / broken URLs in
check_draft). - brandvoice-mcp — ingest → chunk → exemplar retrieval bank (
get_exemplarsserves corpus paragraphs by genre). - book-writer-mcp / Eden — per-genre style profiles (the dashboard shows pooled per-genre stats), and the builder flow where induced rules are shown for correction *before* they are saved (recompute dry-run preview → apply).
- Arcitext — tone-fit via an explicit avoid list, enforced by the checker and editable in the Profile view.
Bounds (named, enforced)
Sample text ≤ 256 KiB and ≥ 10 tokens; draft ≤ 1 MiB, < 200 words = UNRELIABLE verdict (integrity/avoid checks still run); URL fetch ≤ 1 MiB, 15 s, HTTP(S) only, ≤ 3 redirects; JSON-RPC line ≤ 4 MiB; fingerprint build needs ≥ 2 included pieces (leave-one-out calibration is undefined below that) and fails closed otherwise.
Platform notes
- Toolchain pinned to Rust 1.99.0 (
rust-toolchain.toml), matching the estate. GPUI is pinned exactly:gpui-ce = =0.2.2+gpui_ce_platform = =0.1.0(features wayland, x11). - GUI rendering is verified on Wayland (primo's desktop is Hyprland; the smoke runs under a headless wlroots compositor). Under Xvfb/X11 this GPUI build presents black frames — use a Wayland session.
- GUI text entry is click-to-focus, append/backspace only (no selection/IME yet) — a stated limit, tracked in PROGRESS.md.
Layout
crates/eigenstyle-core corpus store, stylometry, fingerprint build, checker, fetchcrates/eigenstyle stdio MCP server (6 tools) crates/eigenstyle-tui ratatui TUI (eigenstyle-tui --snapshot renders headlessly) crates/eigenstyle-gui GPUI GUI screenshots/ smoke evidence (GUI corpus + fingerprint views, probe)
License
This project is licensed under the Apache License, Version 2.0.