Dev Tools
ctx
Hunt down the lowest-cost AI coding setup your repo can rely on.
★ 588 starsMIT
View guide →LeanCTX — the Rust context gateway that controls what your AI coding tools can see.
lean-ctx is an open-source dev tools project by yvgude (yvgude/lean-ctx on GitHub). It has 3,870 GitHub stars and 351 forks, is released under the Apache-2.0 license, and was last updated on GitHub on 8 October 2026.
Decide the first concrete outcome you want from it, so you can pick the right example, template or mode instead of exploring everything at once.
Clone the repository (or install the published package) and skim its README quick start for the requirements for your platform.
Run the documented install step and set any required configuration — such as provider keys, data sources or local services — before the first run.
Execute the smallest documented example end to end, confirm the output is what you expected, then adapt it to your real data or workflow.
16 read modes (full, map, signatures, diff, density and more), 85+ shell-output compression patterns and cached re-reads that return compact references.
An IntentEngine classifies query complexity and a ModePredictor learns the best read mode per file type, so simple lookups stay cheap.
Session memory, a temporal knowledge graph and a property graph of imports/calls/exports power impact analysis and search ranking.
Configured path permissions, content filters and context budgets applied before delivery, with per-agent budgets and throttling profiles.
Local token/cost tracking, Shadow Mode savings estimates and CPAO (cost per accepted outcome) reporting via lean-ctx savings.
ctx_proof / ctx_verify export an audit trail of sources, policy decisions and pipeline provenance.
Get the source so you can inspect, configure and run it locally.
git clone https://github.com/yvgude/lean-ctx.git
cd lean-ctxAfter installing LeanCTX (see the README install matrix for your platform), configure a supported integration.
lean-ctx setup # see README for the exact install command for your platformEnable Shadow Mode, work normally, then check what LeanCTX saved.
lean-ctx config set shadow.enabled true
lean-ctx savingsIt is maintained by yvgude on GitHub (yvgude/lean-ctx), where the source, issues and releases live.
Yes — it is free and open source under Apache-2.0, which permits use, modification and commercial redistribution, with licence/notice retention.
No LLM API key of its own — LeanCTX prepares context locally; your existing AI tool keeps using its own model and key.
Compared with raw MCP filesystem servers or manual context stuffing, lean-ctx's distinguishing focus is: leanCTX — the Rust context gateway that controls what your AI coding tools can see. Pick it when that focus matches your need; the alternative may suit you better if its broader or different scope is the priority.
Clone https://github.com/yvgude/lean-ctx (or install its published package), follow the README quick start to install and configure it, then run the smallest documented example — the Run section on this page mirrors those steps.
Hunt down the lowest-cost AI coding setup your repo can rely on.
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