AutoHarness

AutoHarness is an open-source Claude Code plugin from Tigerless Labs that maintains a skill library for you. It watches your real sessions, distills reusable lessons into native Agent Skills, folds same-scenario skills together instead of piling up near-duplicates, updates them when you correct them, and archives the ones that stop getting used. It only ever touches the skills it wrote itself. What it does - Learns in the background: once a session has done enough work (every 50 tool calls by default), a reflection reads that stretch of the session and proposes new skills or changes to existing ones - /learn distills the session you're in right now, when you've just worked something out and want it kept - Patches and merges instead of duplicating: a correction updates the existing skill, and a periodic curator pass folds narrow skills into broader ones - Opens each session with a grouped index of the skills it wrote, plus a one-line report of what the last run added or rejected - Keeps a skill by whether later sessions actually use it, not by a benchmark score; unused skills are archived (moved aside, never deleted) and can be restored - Logs why each skill was created or changed, with the redacted session excerpt that justified it How it works - Skills land as plain SKILL.md folders in your project's .claude/skills/ or, for techniques that aren't tied to one repo, in ~/.claude/skills/. Its own state lives in .claude/autoharness/. - Reflection runs as a separate background Claude Code session on Haiku, with read-only tools and one staging tool, so it can only propose. A deterministic validator checks each proposal (safety, structure, size, self-authored only) and is the only part that writes. - By default the reflector gets a redacted window of the session plus a short digest of what came before. - It's tunable with AUTOHARNESS_* environment variables: how often it learns and consolidates, a project-only mode, the session-start index, how many skills each layer keeps, and optional desktop or custom notifications. How to install it - It needs Python 3.11 or newer as python3 on your PATH, with no third-party dependencies. - In Claude Code: /plugin marketplace add tigerless-labs/autoharness, then /plugin install autoharness@autoharness, then /reload-plugins. Good to know - It's MIT-licensed, from Tigerless Labs, and built for Claude Code. - Background reflections are extra Claude Code sessions, so they count toward your usage. They run unattended with permission prompts skipped, limited to read tools and the staging tool. - Uninstalling stops it, but the skills it wrote and its state stay on disk until you delete them. Your own skills are never touched.

• “/learn”

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• “Remember this workaround for next time.”

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• “Save how we just fixed this as a skill.”

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• “Distill the lessons from this session.”

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