How do I read a plan.md file an AI agent wrote?

Open the file in a browser tab (file:///…/plan.md) with the Skim extension installed. Skim renders the markdown as a formatted page and live-reloads it in place every time the agent rewrites the file, so you never refresh.

Does Skim work with Claude Code, Cursor, and Codex?

Yes. Skim is agent-agnostic. Any tool that writes plain markdown files, including Claude Code, Cursor, and Codex CLI, produces files Skim can render and live-reload. Skim never runs the agent or calls an LLM itself.

Does the agent need any special setup to work with Skim?

No. The agent writes plain markdown exactly as it already does. Skim is entirely on the reader's side: open the file in a tab and it renders, with live reload, frontmatter cards, mermaid diagrams, and KaTeX math.

For agentic coding

Watch your agent's plan.md come alive

Claude Code, Cursor, Codex, and every CLI agent write markdown faster than you can read it. Skim gives each plan.md, AGENTS.md, and report.md a real page, and keeps it live while the agent writes.

Add to ChromeFree · open source · no sign-up Using another browser? See every install option →

The loop you already run

Agent writes. Page updates. No refresh.

Your agent drops a file and rewrites it as it works. Leave that file open in a tab and Skim re-renders it in place on every save, scroll position preserved. The terminal keeps streaming; the page keeps up.

Nothing new for the agent to learn. It writes plain markdown, the way it already does.

Left: a terminal where an agent writes plan.md. Right: Skim rendering that same file, updating on every save.

Three steps, zero setup

From agent output to a page you can read

Your agent drops plan.md in the project folder, the way it already does.
Open it in a tab: file:///…/plan.md. Skim renders headings, checklists, tables, code, and mermaid diagrams.
Leave the tab open. Every rewrite re-renders in place, scroll kept. Want to steer? Copy for AI puts clean markdown back on your clipboard in one click.

Made for agent files

Every agent convention, rendered

Frontmatter cards

YAML headers render as a tidy key/value card, not a wall of raw dashes at the top of the file.

Folder view

An output directory becomes a reading list. Jump from plan.md to report.md without leaving the tab.

Mermaid & KaTeX

Architecture diagrams and math render as diagrams and equations, not fenced code left to rot.

Offline and private

A plan for your unreleased product never leaves the machine. No accounts, no network calls, nothing collected.

Skim is a viewer, nothing more. It doesn't run agents, call any LLM, or collect anything. It's the reading surface for the tools you already run, the page a plan.md becomes while it's still being written.

Try it in 60 seconds

See it on your own agent output

Paste your last agent output into the free online viewer. Same engine as the extension, nothing uploaded. When you're ready for a tab that keeps up on its own, install once.