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Which editors let an AI comment and suggest on your prose instead of rewriting it?

Last updated 2026-08-17 · Confidence: documented — the Roughdraft site and repo, Lex’s release notes, and dated newsletter posts; the agent-leaves-suggestions direction in Roughdraft is inferred.

Two named tools do this today — Roughdraft for markdown files an agent already touches, Lex for prose written in its own web editor — and since August 2026 agents can leave native comments and suggestions on Google Docs themselves.

The problem: copy-paste round trips

Section titled “The problem: copy-paste round trips”

Iterating on prose in a chat window means pasting text in, getting a rewritten block back, and hunting for what actually changed — with formatting mangled on each trip. Comment-and-suggest tools replace that with feedback anchored to specific passages, accepted or rejected in place.

Roughdraft: review markdown beside your agent

Section titled “Roughdraft: review markdown beside your agent”

Roughdraft is a local-first, open-source (MIT) markdown review editor: your agent writes a file, a CLI command opens it in a Google-Docs-style interface, you leave comments and suggested edits, hit Done, and the agent reads the feedback and revises. Everything is stored as plain CriticMarkup inside the file, so it works with any agent and any other editor. It appeared around June 10, 2026 — the date of the how-to on commenting on agent plans that circulated it. Because the format is symmetric, the agent can leave “ and comments on your draft too.

Alejo recommends Roughdraft, paired with a Docs-sync CLI: download a colleague’s Doc to markdown, review it locally, sync it back — see Docs write path for the routes, and markdown formats for why agents handle .md best.

Lex: suggestions inside a web editor

Section titled “Lex: suggestions inside a web editor”

Lex — a web writing editor from the same founder, whose company also maintains Roughdraft — has had this since February 2023: highlight text and “AI Rewrite” leaves a comment with a suggested rewrite instead of editing, and “Ask Lex” answers questions about a selection in a comment thread. The trade-off: your document lives in Lex, not in files your agents reach.

Google Docs itself, since August 2026

Section titled “Google Docs itself, since August 2026”

Agents can now leave comments and suggestions on Google Docs through the Docs API, working from Claude Code and Codex — details in Docs comments.

Sources

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