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GeezerVison is showing copyleftdev.github.io — Don Johnson (copyleftdev)

What I work on

  • Security research — network beacon detection, distributed scanners, web fuzzers, OSINT frameworks, supply-chain forensics
  • Developer tooling — self-hosted tunnel servers, webhook inspectors, deterministic crawlers, CI/CD automation
  • AI infrastructure — Model Context Protocol servers, multi-agent coordination protocols, DSLs for composable AI systems
  • Systems programming — Rust-first, with production work in Zig, Go, Python, TypeScript, and Nim
  • Verification — contract-first design, property-based testing, mutation testing to zero survivors, deterministic replay
If it can't be deployed with scp and run without a runtime, it's probably too complicated.

Public work

Generated from the GitHub API on every run, so this list cannot outlive the repositories it describes. Forks are excluded. Machine-readable: repos.json, llms.txt.

Security & detection 25

Beacon detection, anomaly detection, scanners, fuzzers, supply-chain and network forensics.

  • anomalyx Rust★ 3

    Contract-first anomaly detection across ~30 formats — logs, security telemetry (syslog, CEF/LEEF, EVTX, Suricata EVE, osquery, CloudTrail), network (pcap, NetFlow, DNS), observability (OTLP, Prometheus, journald), data (CSV/JSON/Parquet/SQLite/Avro/ORC). Deterministic Rust CLI; 9 detectors / 7 classes; NIST-validated, mutation-tested.

  • palimpsest Rust★ 3

    Deterministic crawl kernel in Rust — same seed, identical crawl, identical replay. BoringSSL TLS impersonation (JA3/JA4), 17-patch CDP stealth mode, BLAKE3 content-addressed storage, WARC++ format, distributed crawling, RAG extraction. 288 tests, 15 crates, 10K pages proven.

  • skbx Rust★ 2

    Agent-first Linux packet-path tracing with Rust/eBPF: bounded evidence, deterministic replay, and packet routes with receipts.

  • floq Zig★ 1

    Detect C2 beacons in network traffic using Floquet spectral analysis from quantum chaos theory. Fast, 274KB Zig binary. Reads pcap, live capture, or OpenTelemetry JSONL.

  • long-shadow Python★ 1

    Operation Long Shadow · Forensic investigation of a four-cluster GitHub repo-laundering operation that buries fabricated commits in 2037 to bubble laundered repos to the top of every AI-built-code search.

  • mini-shai-hulud-dragnet Shell★ 1

    Forensic dataset + live dashboard for the 2026-04-29 'A Mini Shai-Hulud has Appeared' npm supply-chain worm by TeamPCP. 1,117 dropbox repos, 22 compromised accounts, 47 IOCs across 14 kinds. Trojaned: @cap-js, mbt, @bitwarden/cli. C2 attribution to AS209101 IP Vendetta Inc. JSONL data · kinetic dashboard · CC-BY-4.0.

  • bifrost-editorial Python

  • bitf TypeScript

    Live crypto market observatory with a fluid correlation network, streaming telemetry, and historical replay.

  • bruno Rust

    Zero-trust proxy network — nodes prove hardware identity via TPM 2.0 remote attestation before receiving ephemeral mTLS certificates. Written in Rust.

  • claude-rust-todo-tutorial Shell

    Production-grade Claude Code artifacts (hooks, agents, commands, gates, sweeps, drifts) wrapped around an axum + sqlx + sqlite todo API. Tutorial.

  • darkstar Zig

    Backend-less internet health and flux monitoring tool (Zig)

  • dev-to-comment-hustle Shell

    Evidence file: a DEV comment-spam campaign traced to a legitimate SaaS affiliate link. Not malware — the economics are the vulnerability. 15 raw captures, 6 diagrams, reproduce script.

  • evidence-driven-development HTML

    A runnable evidence-driven development tutorial: falsifiable claims, SQLite retries, negative controls, and reproducible results.

  • execution-evidence-lab Python

    A native Linux backup lab with independent verification, eBPF probes, CPU sampling, packet captures, and a reproducible companion article.

  • hawaii-influencer-house HTML

    Can a ten-bedroom creator house in Hawaii pay for itself? An exact-arithmetic feasibility model where no figure was produced by a language model. Powered by Bento.

  • kilo-data Rust

    Open threat-intelligence and IP-reputation ETL for phishing and abuse screening, with BGP and Arrow/Parquet releases

  • kilocheck Rust

    Local-first deterministic IP intelligence CLI with auditable evidence and policy-grade JSON

  • leet-touch Python

    Touch every layer of Git and GitHub—from first commit to platform engineering.

  • seiche Rust

    Height-ordered incremental computation DAG, cutoff propagation, O(1) incremental folds, idempotent delta algebra, sequence-gap book reconstruction, and VOPR simulation testing for prediction-market orderbooks.

  • seuil-rs Rust

    A complete, safe JSONata implementation in Rust — JSON query, transform, and expression evaluation

  • solve-score Rust

    Independent Rust implementation of SOLVE v0.5, Irregular's rubric for scoring vulnerability-discovery and exploit-development difficulty. Reproduces all 16 published DownUnderCTF calibration assessments.

  • squib Rust

    Trust-scheduling execution fabric: run untrusted workloads in tiered disposable sandboxes (Firecracker microVM / gVisor / Xen) and emit host-sourced, tamper-evident evidence.

  • totp-rfc Rust

    Security-hardened, allocation-free no_std HOTP/TOTP for Rust with strict RFC 4226/6238 behavior and constant-time verification.

  • vulngraph-cli Rust

    Focused, offline-first vulnerability intelligence CLI — CVE & package-version checks with typed evidence, from verified data releases

  • vulngraph-data Rust

    Deterministic data pipeline for VulnGraph — ingests 11 vulnerability sources, publishes reproducible checksummed graph releases

Developer tools 35

Single-binary utilities for the parts of the workflow that usually need a service.

  • tailx Zig★ 4

    Live system cognition engine. Reimagines tail from "show me lines" to "what's happening, what matters, and why?" Auto-detects log formats, groups patterns, detects anomalies, reconstructs traces, outputs structured JSON for AI agents. 144 KB. Zero config. 69K events/sec.

  • vajra Rust★ 3

    Break noise. Preserve truth. A deterministic semantic reduction engine for structured data — JSON, YAML, CSV, NDJSON, Markdown, PDF. Fingerprinting, entropy, anomaly detection, schema drift, clustering, and AI-ready essence generation. Built in Rust.

  • cora Rust★ 1

    Multi-pattern fixed-string matcher. Aho-Corasick + SIMD on mmap'd files. NDJSON output for AI agents and pipelines.

  • cosaci Rust★ 1

    Distributed attested CI mesh — property-tested at every layer

  • dev-portal-correctly JavaScript★ 1

    Specification-first developer portal: modular OpenAPI 3.1 + AsyncAPI 3.1 sharing one domain model, an enforced error registry, and CI that can actually fail.

  • jevlin Zig★ 1

    Zig SDK for TypeSafe AI's Jev decision API. Typed classification, scoring and yes/no probabilities with bounded buffers, retries and deadlines.

  • leet-index JavaScript★ 1

    Activity-aware rankings for US-based GitHub developers, with transparent scoring and exportable public data.

  • whatthediff Zig★ 1

    What actually matters across N files: consensus, drift, outliers and variant families — for configs, JSON, YAML, XML, PDF, even executables (SSDeep-class fuzzy analysis). Deterministic, evidence-backed, zero-dependency Zig.

  • art-of-context-and-intent HTML

    Why prompts are just the surface. Depth comes from the system you build. — Don Johnson

  • chathound Rust

    Polite, exhaustive tap of Kalshi live-market chat: AIMD adaptive polling that hears the whole venue without overwhelming it. Position-annotated NDJSON stream.

  • chronicle-forge Python

    Forge the past. Test the future. A reproducible Git and GitHub forensics lab with synthetic histories, virtual time, and ground-truth fixtures.

  • cistron Rust

    A convention-safe genome-variant kernel: normalization + VCF/HGVS/VRS boundaries + liftover, validated byte-for-byte against bcftools, vrs-python, and biocommons hgvs.

  • coelacanth Zig

    AI-first Unix primitives, clean-room reimplemented in Zig under one self-describing, machine-checkable contract

  • entropyx Rust

    A forensic instrument for codebases. A quantifiable way to tell the truth.

  • entropyx-survey Rust

    A cartographic browser survey for entropyx: streaming scans over SSE, a printable plain-language brief, and the scoring kernel in WebAssembly.

  • gemma-4-challenge Python

    Care Compass: Gemma 4 healthcare navigation demo with Aion signed-policy decision evidence

  • hook-bin Rust

    Single-binary webhook inbox — capture, inspect, and debug HTTP webhooks with zero dependencies. Embedded SQLite, live dashboard, cross-platform. Just scp and run.

  • jevwright JavaScript

    Typed Jev decisions, native Playwright actions. Reusable browser automation with procedural and business UAT gyms.

  • kalshi-kernel Go

    Unofficial safety-focused MCP kernel for Kalshi market workflows

  • linux-archaeology-lab Shell

    Hands-on exercises for forgotten Linux pipe & stream commands — sample data, real exercises, Claude Code skill included.

  • overpunch-rx Rust

    Fast, allocation-free Rust library for signed overpunch and zoned decimal encoding/decoding. ASCII/EBCDIC, exact decimals, fixed-width COBOL/mainframe records, and no_std.

  • oxide-ci Rust

    A modern, extensible, high-performance CI/CD engine written in Rust.

  • pegrep Rust

    Text and structural search with readable PEG patterns, typed captures, and JSON output.

  • pi-mini-rack

    Cost-optimized 10-inch Raspberry Pi cluster rack builds (–). Four verified BOMs with PoE+ switch, DeskPi RackMate, and UPS. MILP-optimized pricing.

  • r30rg Rust

    Chaos & adversarial testing framework for Arbitrum rollup stacks — deterministic simulation + live Docker fault injection. Same seed = same chaos = reproducible bugs.

  • shard-router Makefile

    Deterministic-first shard router for the Kalshi exchange: verified shard resolution, exact integer fee schedules, async-safe prefunding, ledger reconciliation, VOPR-style DST. Rust, TigerStyle.

  • simulated-annealing-article Rust

    Stop Guessing: simulated annealing article with a reproducible Rust experiment, equal-budget baselines, raw results, and independent verification.

  • superforecasting-skills-pack Python

    Thirteen research-attributed forecasting skills for Claude — Brier scoring, calibration decomposition, logit pooling, Bayesian updating, reference classes, conditional trees. Every technique names its research and states its limits.

  • tapehound Rust

    High-performance Kalshi venue scanner: liquid markets, whale fills, live SSE stream. Rust, SIMD hot path, TigerStyle discipline.

  • tlatools-rs Rust

    Ask a TLA+ specification about a state, and get an answer. A parser and evaluator for TLA+ in Rust — not a model checker.

  • tokentip-go Go

    Official Go SDK for the TokenTip API — tips that buy AI inference credit. Zero dependencies, stdlib only.

  • tokentip-js TypeScript

    Official TypeScript SDK for the TokenTip API — tips that buy AI inference credit. Zero runtime deps.

  • tokentip-python Python

    Official Python SDK for the TokenTip API — tips that buy AI inference credit. Sync + async, typed.

  • vervet Rust

    AI-native adversary-emulation & breach-and-attack-simulation (BAS) instrument in Rust — atomic MITRE ATT&CK techniques an LLM can orchestrate, behind Ed25519-signed authorization scopes, emitting typed tamper-evident evidence.

  • zgrok Rust

    Self-hosted ngrok alternative in Rust. Development in progress - check out the issues for detailed specs.

AI & agent infrastructure 28

Protocols, servers, and exact instruments for multi-agent systems — built so an agent gets facts instead of guesses.

  • agent-calc Rust★ 4

    AI-native exact calculator and contract-first Rust CLI for typed JSON math, symbolic reasoning, property tests, and mutation-tested agent workflows.

  • nasa-power-of-ten-skill Python★ 3

    Unofficial portable Claude Code and Codex skill for NASA/JPL Power of Ten code reviews.

  • braess-router Rust★ 2

    Bounded semantic routing with Jev and Poise. Rust, single-server, alpha.

  • jev-labs Python★ 2

    Never confidently wrong: a TLA+-verified consensus kernel around TypeSafe's Jev, run through 1,680 chaos-tested pharmacy decisions with zero wrong verdicts. Film, code, and every captured call.

  • kahea Rust★ 2

    OpenAPI testing and deterministic API fuzzing for AI agents—catch contract bugs before unsafe calls with local-first sealed plans, MCP, and replayable evidence.

  • sk1llz Python★ 2

    The skills of the gods, encoded for mortals. Legendary engineer coding philosophies as Anthropic-compatible Skills.

  • smesh-rust Rust★ 2

    Consensus without a center: a Rust protocol where agents coordinate through signals that diffuse, decay and get reinforced. A2A v1.0 gateway, QUIC P2P mesh, plain-language agent routing, and a read-only prediction-market research mesh.

  • symgliph Rust★ 2

    SCGP reference implementation in Rust: compile large codebases into verified semantic graphs, deterministic glyphs, and token-budgeted AI context.

  • murmur Rust★ 1

    Voice typing that never leaves your machine. Local NVIDIA Parakeet transcription, Rust + iced, for Linux.

  • rational Python★ 1

    AI cost, with the vibes removed. Exact-rational models + a live calculator for the 8 LLM inference-cost decisions every agent builder faces — model choice, routing, self-host, the reasoning-token tax, cascades, caching, and the O(K²) agent loop. Every number reproducible.

  • runs-on-compute Python★ 1

    A curated, living directory of open-source AI tools that run on inference — and how to fund the people who build them. Published by TokenTip.

  • smesh-crawler Rust★ 1

    Agent-orchestrated web crawler for exact evidence and historical changepoints—with deterministic policy, robots compliance, and local MCP support.

  • smesh-devteam Rust★ 1

    An elite dev team as a signal mesh: LLMs propose, deterministic gates adjudicate, humans ratify

  • allman Rust

    High-performance MCP agent mail server — lock-free message routing, NRT search, Git audit trail. Built in Rust.

  • copyleftdev Python

    Systems-level software engineer building security tools, developer infrastructure, and AI-native systems in Rust, Go, and Zig. 560+ open source repositories.

  • cowiki-rs Rust

    Formally verified spreading activation primitives for the Co-Wiki architecture (Shomo, 2026). 7 Rust crates, 113 tests, 0 unsafe.

  • devto-mcp Rust

    An MCP server for authorship on dev.to, with the platform's real rules built in — offline validation, rate-budget pacing, and a capability gate dev.to's unscoped API key cannot provide.

  • hearth HTML

    Put AI compute in the 82 million houses that already have a grid connection. An exact-arithmetic feasibility study of residential AI inference as an alternative to the data center buildout.

  • humanlang Shell

    37 programming languages, one human intent. Token bucket rate limiter implemented across 60 years of languages (1957-2016) — proving that human language is the ultimate source code.

  • kitboga HTML

    Defensive Claude Code scam-baiting agent harness with personas, stall tactics, anti-detection, session state, intel extraction, and call QA.

  • nim-toon Nim

    Nim implementation of TOON (Token-Oriented Object Notation): compact, human-readable JSON serialization and parsing for AI and LLM prompt workflows.

  • skillexec Rust

    A binary container for agent skills: SKILL.md compiled into a signed, tiered, content-addressed graph — with capability-gated wasm segments and an organization compiler.

  • stretch Rust

    MCP control plane kernel — routes intents through policy, federates upstream MCP servers, and reasons with Claude Opus 4.7. Named after IBM Project Stretch (IBM 7030, 1961).

  • supercast Rust

    Rust primitives for probabilistic forecasting and AI agents: Bayesian updates, calibration, scoring, decision theory, and auditable journals.

  • taxis-bench TypeScript

    An adversarial certification environment for agentic RPA: does the agent respect its authorization envelope and commit exactly once under ambiguity? Scores conduct, not just correctness.

  • TUNDR Go

    A high-performance optimization server implementing the Model Context Protocol (MCP) for mathematical optimization tasks, with a focus on Bayesian Optimization using Gaussian Processes. Designed for reliability, scalability, and ease of integration in production environments.

  • zemacs Zig

    The Agentic MCP Server for Emacs. Multi-agent orchestration and autonomous coding tools in Zig.

  • zero-tokens

    avoid metered tokens

Systems & protocol 25

Protocol implementations, runtimes, and load-bearing primitives.

  • emv-3ds Rust★ 7

    EMV 3-D Secure 2.x (3DS2) protocol — AReq/ARes/CReq/CRes messages, transaction state machine, ECI/CAVV helpers, and full EMVCo spec serialization for payment authentication (SCA/PSD2)

  • micro-containers Go★ 6

    One Go HTTP server. Five isolation runtimes. gVisor, Kata, Firecracker, and WASM benchmarked.

  • tak-rs Rust★ 5

    High-performance Rust kernel for the TAK (Team Awareness Kit) ecosystem — drop-in replacement for the messaging core of the Java TAK Server. Cursor-on-Target (CoT) over mTLS, single-node firehose at 10k+ concurrent clients. Compatible with ATAK, iTAK, WinTAK.

  • circuitbreaker-rs Rust★ 1

  • lotto-vs-kalshi ★ 1

    The $20 Question: exact-math essay on why spreading $20 across 0.1¢ prediction-market longshots beats the lottery (10.23x less loss per dollar)

  • poise-rs Rust★ 1

    Composable, rigorously verified load-balancing primitives for Rust

  • akamaiforms-site HTML

  • asm_ftw Assembly

  • cascade-article

  • claimzen-site HTML

    ClaimZen — evidence-backed denial recovery. Marketing site.

  • deflect-rs Rust

    Composable, kernel-adjacent DDoS-mitigation primitives in Rust — rate limiting, SYN cookies, signatures, reflection/amplification defense, learned fingerprints, nftables enforcement, flow telemetry, and upstream RTBH.

  • does-the-grid-bind Python

    Does the grid bind? An invariant audit of the AI energization gap — the conclusion is ~80% likely right, and most of its stated reasons are wrong. TLA+, exact rational arithmetic, 86 provenance-tagged parameters.

  • gashammer Rust

    Adversarial load testing and correctness verification for Arbitrum Nitro rollup infrastructure. Built by @copyleftdev. Hat tip to @PlasmaPower and the @OffchainLabs engineering team.

  • humanitas TypeScript

    Unofficial Effect-native TypeScript SDK for the Humana Data Exchange APIs (Apigee + FHIR R4).

  • hypertiger Rust

    Early alpha. A Hyperliquid kernel for Rust in TigerBeetle's style: no_std, no floats, deterministic simulation. Not ready for real money.

  • interview-with-a-binary-media

    Media for I Interviewed an Executable. It Had Notes. — cover art, replay stills, and video. No executable source or raw telemetry.

  • invariantd-site HTML

    Marketing site for invariantd.com — video-first landing

  • jane-got-skills Python

    Jane Street personas and practice skills for Claude Code, grounded in public sources and gated by verbatim-quote, speaker-attribution and compiled-snippet checks. Not affiliated with Jane Street.

  • pipeflow Python

  • rime Rust

    Lock-free delta-xDS control plane for Envoy. Incremental updates, zero-copy fan-out, content-addressed versioning — the performant Rust alternative to go-control-plane.

  • seuil-bench HTML

    Seuil Proof of Rigor — WASM benchmark visualization

  • Space-Shooter-Pro

    Unity Simple 3D Shooter

  • the-last-honest-abstraction

    An essay about abstraction, engineering judgment, and why AI changes the burden of proof—not the need for engineering.

  • the-shape-of-failure Python

    Executable essay on AI system boundaries, property-based testing, and mutation testing

  • viable-hospital HTML

Education & the absurd 4

Teaching material, and things built entirely too seriously on purpose.

  • git-archaeology-lab Shell★ 1

    Hands-on exercises for forgotten git commands — crafted history, real bugs, real bisect targets.

  • OverHelloWorld Go★ 1

    A robust, over-engineered "Hello World" Go application demonstrating: DDD, CQRS, and event sourcing Redis and file-backed event bus Plugin system (ASCII, TTS, LED, etc) Prometheus & OpenTelemetry observability Property-based and integration tests Automated test reporting and coverage

  • tip-to-tip-efficiency Rust★ 1

    Mathematically serious Rust crate for a deeply unserious Silicon Valley tip-to-tip efficiency empire.

  • fafoaas TypeScript

    FAFO as a Service — an event-driven homage to FOAAS and a working masterclass in spec-first engineering: AsyncAPI 3 + MCP, polyglot codegen, derived contract tests, a generated conformant server, 98/98 mutation score. Consequences: eventual.

Recently pushed

  • leet-index 2026-11-12
  • kilo-data 2026-11-12
  • vulngraph-data 2026-11-12
  • copyleftdev 2026-11-12
  • overpunch-rx 2026-11-11
  • smesh-rust 2026-11-10
  • jane-got-skills 2026-11-08
  • hypertiger 2026-11-06

Elsewhere

  • github.com/copyleftdev
  • dev.to/copyleftdev
  • www.linkedin.com/in/donscv
  • lib.rs/~copyleftdev
  • crates.io/users/copyleftdev
  • www.gitmesh.app
  • tokentip.to/@copyleftdev
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