Show HN: Skillmaxxing – make every agent self-evolving Skillmaxxing, a new open-source CLI tool, enables coding agents like Claude Code and Codex to automatically create and improve their own skills over time by reflecting on completed work, eliminating the need for manual commands or triggers. The tool hooks into agent sessions to crystallize reusable patterns into persistent skills, making agents self-evolving and more efficient on specific codebases. Inspired by the Hermes Agent self-improvement loop, Skillmaxxing requires Node.js 20+ and can be installed globally or via npx. Self-evolving skills for your coding agent. Your agent auto-creates and auto-improves its own skills as it works — no command, no trigger, no babysitting. Every coding agent starts every task from zero. It solves the same gnarly migration, re-derives the same release flow, re-learns the same repo quirk — and forgets it the moment the session ends. Skill Maxing makes the forgetting stop. It hooks into your agent so that, after real work, the agent reflects on what it just did and crystallizes the reusable parts into a skill — or improves a skill it already has. Over days, your agent gets measurably better at your codebase. That's a self-evolving agent, and it takes one line to turn on. Inspired by the Hermes Agent https://github.com/NousResearch/hermes-agent self-improvement loop, adapted to run on the hooks that Claude Code, Codex, and other agents already expose. Requirement: Node.js ≥ 20 the CLI is a Node program . Check with node -v . npm i -g skillmaxxing && skillmaxxing plugin install Installs the CLI globally and wires the hooks to it. Restart your agent session and you're done — you never have to invoke anything. Fast, persistent, and works on every laptop. npx skillmaxxing plugin install Works without installing anything globally; the hooks fall back to a version-pinned npx call. Great for trying it out — for daily use prefer the global install the npx hook adds a little latency at each turn-end . /plugin marketplace add Bennyoooo/skillmaxxing /plugin install skillmaxxing npm i -g skillmaxxing && skillmaxxing plugin install --agent codex Codex has no programmatic stop hook, so self-evolution runs in-session via standing guidance written to AGENTS.md . Claude Code gets the full background loop below. Pick one mechanism per agent.For Claude Code, use either the marketplace pluginor plugin install — not both, or you'll get duplicate hooks. Manage it any time: skillmaxxing plugin status is it active? skillmaxxing plugin uninstall remove the hooks Skill Maxing installs just two hooks. You do nothing — the loop runs itself. ┌──────────────────────────────────────────────────────────────┐ │ SessionStart → inject standing guidance │ │ "crystallize reusable work; fix stale skills"│ │ │ │ Stop task done → count tool calls in the transcript; if │ │ enough new work accrued, fork a background │ │ reflector: review the session and, if │ │ warranted, create ONE new skill or improve │ │ an existing one — autonomously, trusted:false│ └──────────────────────────────────────────────────────────────┘ There's no per-tool hook — work is counted from the session transcript at Stop — so the agent stays fast on every install path. This mirrors Hermes' layers: | Hermes | Skill Maxing | |---|---| | Always-on system-prompt nudge | SessionStart hook injects skill-creation guidance | | Background review after N iterations | Stop hook counts transcript tool calls and forks a headless reflector past a threshold | | Provenance-gated curation | New/changed skills are recorded until you approve them trusted: false | Two key Hermes ideas carry straight over: the reflector prefers updating an existing skill over creating a near-duplicate , and it is conservative — most sessions produce no skill at all. | Mode | What happens on a substantial session | Pick it when | |---|---|---| auto default | A background agent claude -p , restricted to skill tools reflects and writes/updates a skill while you keep working | You want truly hands-off self-evolution | nudge | The agent is reminded to crystallize the workflow itself, in-session | You want zero extra processes / full visibility | npx skillmaxxing plugin install --mode nudge --threshold 12 The background reflector is recursion-guarded it can never trigger itself and detached it never blocks your session . Every skill it writes is trusted: false and never auto-executes until you grant trust. Everything above is built on two CLI primitives the reflector or you can call directly. The CLI is model-agnostic — it does the deterministic work; your agent supplies the reasoning. Create — turn a workflow into a tested skill: skillmaxxing skillify --draft draft.json stage → smoke-test → review → --commit Improve — make an existing skill measurably better, safely: skillmaxxing optimize