checklist.day

The problem

Agents fail not because they lack intelligence. They fail because the information they act on is stale or wrong. APIs change. Import paths move. Breaking changes ship without warning. There is no canonical, machine-readable source of truth for what a library actually looks like right now. READMEs lag. Official docs are written for humans. The internet is full of confidently wrong, outdated answers.

What this is

checklist.day is a registry of packages, SDKs, APIs, CLIs, and MCP servers. Structured for machines, readable by humans. Every entry has the correct install command, working import paths, current version, and links to canonical sources.

Agents and AI systems access it via an API or MCP server. Any system in the world can read it.

What we cover

librarypip/npm installable packages
sdkofficial clients for services
apiREST endpoints, auth, error codes
clicommands, flags, breaking changes
mcpMCP servers, tools, transports

Who built it

@kitxor. Feedback welcome.