C, marked
Every repository here has at least 1,000 stars and was marked against the same scheme. Curated lists, books, and tutorials are marked separately and left out, since asking whether an agent can install a list of links means nothing.
The class as a whole
873
repositories marked
63
median mark out of a hundred
37%
have no test command an agent can find
35%
ship an AGENTS.md
Seeded from the 864 most-starred repositories on 25 August 2026 and re-marked since. Figures current to 10 October 2026.
| Repository | MD | Language | Added | Stars | Mark | ||
|---|---|---|---|---|---|---|---|
| 1 | colbymchenry/codegraph Pre-indexed code knowledge graph, auto syncs on code changes, for Claude Code, Codex, Gemini, Cursor, OpenCode, AntiGravity, Kiro, CoPilot, and Hermes Agent — fewer tokens, fewer tool calls, 100% local | ✓ | C | 25 Aug | 74k | 82 | A- |
| 2 | microsoft/PowerToys Microsoft PowerToys is a collection of utilities that supercharge productivity and customization on Windows | ✓ | C | 25 Aug | 139k | 58 | B- |
| 3 | php/php-src The PHP Interpreter | ✓ | C | 25 Aug | 40k | 55 | B- |
| 4 | curl/curl A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features | · | C | 25 Aug | 43k | 52 | C+ |
| 5 | tmux/tmux tmux source code | ~ | C | 25 Aug | 50k | 51 | C+ |
| 6 | redis/redis For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine. | · | C | 25 Aug | 77k | 47 | C |
| 7 | git/git Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documentation/SubmittingPatches procedure for any of your improvements. | · | C | 25 Aug | 64k | 46 | C |
| 8 | DeusData/codebase-memory-mcp High-performance code intelligence MCP server. Indexes codebases into a persistent knowledge graph — average repo in milliseconds. 158 languages, sub-ms queries, 99% fewer tokens. Single static binary, zero dependencies. | · | C | 25 Aug | 46k | 45 | C |
| 9 | jqlang/jq Command-line JSON processor | · | C | 25 Aug | 36k | 45 | C |
| 10 | Genymobile/scrcpy Display and control your Android device | · | C | 25 Aug | 152k | 44 | C |
| 11 | FFmpeg/FFmpeg Mirror of https://git.ffmpeg.org/ffmpeg.git | · | C | 25 Aug | 65k | 42 | C |
| 12 | mpv-player/mpv 🎥 Command line media player | · | C | 25 Aug | 37k | 39 | D |
| 13 | obsproject/obs-studio OBS Studio - Free and open source software for live streaming and screen recording | · | C | 25 Aug | 77k | 38 | D |
| 14 | wg/wrk Modern HTTP benchmarking tool | · | C | 25 Aug | 40k | 37 | D |
| 15 | pbatard/rufus The Reliable USB Formatting Utility | · | C | 25 Aug | 38k | 37 | D |
| 16 | nothings/stb stb single-file public domain libraries for C/C++ | · | C | 25 Aug | 35k | 35 | D |
| 17 | bilibili/ijkplayer Android/iOS video player based on FFmpeg n3.4, with MediaCodec, VideoToolbox support. | · | C | 25 Aug | 33k | 35 | D |
| 18 | ventoy/Ventoy A new bootable USB solution. | · | C | 25 Aug | 80k | 33 | D |
| 19 | torvalds/linux Linux kernel source tree | · | C | 25 Aug | 251k | 32 | D |
| 20 | raysan5/raylib A simple and easy-to-use library to enjoy videogames programming | · | C | 25 Aug | 35k | 32 | D |
| 21 | valinet/ExplorerPatcher This project aims to enhance the working environment on Windows | · | C | 25 Aug | 34k | 30 | D |
Mark yours.
Two API calls. Nothing cloned, nothing executed, no account.