Devin (formerly Windsurf)

Facts

Openness

Closed, studied from outside

Licence

proprietary

Language

Not stated

Pinned version

Official documentation (the code is closed)

Topics checked

31 of 33

Kind of agent

Coding

Project page (opens another site)

What it does notably well

• Safe repeats

  Dynamic Workflows re-run a deterministic Python script on resume and replay each completed agent call from its recorded result by a content hash.

• Working plan

  The Local plan is a persistent Markdown file under ~/.devin/plans that the user can edit or give to a fresh session, so the plan lives outside the context window.

• Proactive triggers

  Preflight check (an optional step the docs say is still being rolled out to organizations): a short-lived script in a separate VM reads the event and its saved state and decides…

• Prompt caching

  Fusion changes which model leads at a compaction boundary, where a cache miss would happen anyway, so switching models costs no extra cache miss (Cognition's own account).

• Retrieval quality

  Code search is delegated to a restricted-tool retrieval subagent (up to 8 parallel calls, 4 turns) so the search trajectory stays out of the main agent's context.

• Sandboxing

  Security profiles bind to org, automation and session in a hierarchy, and child sessions follow the parent chain so delegation cannot loosen restrictions; mandatory profiles are…