Plandex

Large refactors and multi-step features are the target workload for Plandex, a Go-based terminal agent that maintains an effective context of 2 million tokens and indexes projects of 20 million tokens or more using tree-sitter maps covering over 30 languages. Instead of editing files directly, it accumulates proposed changes in a version-controlled sandbox where cumulative diffs can be reviewed, revised, or rejected before anything touches the working tree, and autonomy is configurable from full auto down to step-by-step approval. Model packs mix providers, so Anthropic, OpenAI, Google, and open weights models each handle the roles they fit best, with billing through your own API keys. The MIT-licensed server self-hosts with Docker; the hosted Plandex Cloud began winding down in October 2025 and development activity has slowed since, so self-hosting is the practical path today. The repository has about 15,500 GitHub stars, and it remains a reference design for diff-first, large-context agent workflows.