TodoMVC

The canonical todo app — the reference specification every framework implements.

20 capabilities 2 sections reference specification

Build against it

# give your agent the catalog — no account, no install
claude mcp add provespec -- npx -y provespec-mcp

# then, from any agent session
spec_get(slug: "todomvc")                → the capability tree
spec_checklist(slug: "todomvc")          → the questions to answer
spec_grade(slug: "todomvc", grades: [...])  → parity % + the gap list

# or just fetch it
curl https://provespec.com/catalog/todomvc/spec.json

Grade every capability below as yes · partial · no · na, with a file reference as evidence. Whatever you leave ungraded counts as missing — the gap list is the work queue.

Or just paste this to your agent

Use the ProveSpec MCP server. Fetch the "todomvc" spec with
spec_get, then walk spec_checklist and grade this repository against it —
one verdict per capability, each with a file reference as the note.
Call spec_grade with the results and give me the gap list as the plan.

If the server is not registered, add it first:
  claude mcp add provespec -- npx -y provespec-mcp

The specification

AI 9

Model

✓ Todo item shape id, title, completed unique id per todo
✓ Add todo trimmed title; empty input is ignored
✓ Edit todo title empty result deletes the todo
✓ Toggle completed per item
✓ Toggle all sets all to the same state; unchecks when all complete
✓ Delete todo
✓ Clear completed removes all completed items

Persistence

✓ Todos survive reload localStorage or equivalent local store

Routing

✓ Filter routes #/, #/active, #/completed filter state in the URL, restored on load

UI 11

List

✓ Render todos per active filter
✓ Hide chrome when list empty main section and footer hidden with no todos

New todo input

✓ Focus on load autofocus
✓ Enter adds and clears input

Item

✓ Double-click enters edit mode input focused, caret at end
✓ Enter/blur commits, Escape cancels
✓ Completed styling strikethrough
✓ Destroy button on hover

Footer

✓ Active items counter "N items left" correct singular/plural
✓ Filter links with selected state All / Active / Completed
✓ Clear-completed visibility shown only when completed items exist

Open in Parity → Download spec.json All 102 specs