🧠 WikiSkill

Compile agent experience into a persistent wiki — and let skills evolve themselves.

📚 Docs site: ashutoshsinghpr7.github.io/wikiskill · arXiv: 2608.27454

A faithful, production-minded implementation of WikiSkill: Compiling Agent Experience into Persistent Knowledge for Skill Evolution (arXiv:2608.27454, Google Research). The loop is agent-agnostic — Hermes Agent is the reference backend (built natively), Claude Code ships in the box, and Codex/OpenCode are on the roadmap (issue #13). Your agent becomes both the student and the teacher.

What this is

Agents fail. They also learn — but the lessons usually die with the session. WikiSkill fixes that by keeping a persistent knowledge wiki alongside the skill set, and running a closed evolution loop:

1. The agent runs training tasks with its current skills → raw execution traces
2. A Wiki Maintainer agent distills the traces into pattern pages (root causes, fixes)
3. A Skill Proposer agent reads the wiki + traces and proposes one skill change (create or patch)
4. Gating: the change is validated on held-out tasks — strictly better than the best score so far → kept; otherwise rolled back. The wiki is never rolled back.

Over iterations, knowledge compounds in the wiki while only proven improvements touch the skills.

                ┌──────────────────────────────────────────────────────┐
                │              EVOLUTION LOOP (Algorithm 1)            │
                │                                                      │
   tasks ─────► │  Inference Agent ──► raw/traces/ (immutable)         │
                │        │                                            │
                │        ▼                                            │
                │  Wiki Maintainer ──► wiki/patterns/, index, log     │
                │        │                                            │
                │        ▼                                            │
                │  Skill Proposer ──► proposal (create/patch skill)   │
                │        │                                            │
                │        ▼                                            │
                │  GATE: val score > R_best? ──yes──► keep, R_best=R  │
                │        │ no                                         │
                │        ▼                                            │
                │  rollback skills; wiki retained forever             │
                └──────────────────────────────────────────────────────┘

Why Hermes?

This is not a toy simulator. Every component is a real Hermes agent turn:

Why the isolated profile matters: gating is only meaningful if the agent sees exactly the candidate skill set. Each evolution workspace gets its own HERMES_HOME (bundled skills opted out, empty memory, skills symlinked per stage) — your real profile is never touched.

Quickstart (60 seconds)

pip install wikiskill        # from PyPI (wheel + sdist, Python ≥3.10)
wikiskill init demo           # workspace + 22-task auto-graded bench (13 train / 9 val)
wikiskill status
wikiskill evolve --iters 3    # full Algorithm 1 loop with your default model

Or from source: pip install -e . (installs the same wikiskill CLI).

That's it. Each evolution workspace lives at workspaces/<domain>/:

workspaces/demo/
├── raw/traces/iter-01/{train,val}/<task>.jsonl   # immutable execution traces
├── wiki/                                          # persistent knowledge (never rolled back)
│   ├── index.md  ·  log.md  ·  skill-impact.md  ·  patterns/*.md
├── skills/active/                                 # git-managed evolving skill set (S₀ = ∅)
├── skills/framework/                              # maintainer + proposer agent skills
├── bench/tasks/<id>/                              # task sandboxes (inputs + grader)
└── runs/                                          # per-run stdout, proposals, state

CLI

Bring your own tasks

Tasks are plain JSON (tasks.json); anything auto-gradable works:

{
  "id": "spec-format1-1", "split": "train",
  "title": "Format products according to spec",
  "prompt": "Read spec.md and products.json...",
  "sandbox": {"spec.md": "...", "products.json": "..."},
  "grader": {"type": "exact", "file": "output.txt", "expected": "alpha|35|active\n..."}
}

Graders: exact, contains, json_field, code_stdout (runs the produced script). Missing deliverables score 0, never crash.

Live results so far

Honest numbers from real agent runs on the bundled bench:

The gating mechanism has caught both a neutral and a harmful proposal live. Full logs in docs/RUNS.md.

Design decisions worth knowing

• --in doesn't pin the agent's CWD in single-query runs → every inference prompt embeds an absolute WORKING DIRECTORY and forbids exploring outside it.
• Sessions live in state.db, not loose files → transcripts are materialized via hermes sessions export --format jsonl.
• Rejected proposals are never lost — their full content is embedded in wiki/skill-impact.md so future proposers don't repeat them (per Appendix E.3).
• The demo bench has traps: subtle-spec tasks and multi-bug debug scripts whose bugs don't compensate (verified at generation time).

How this compares to other community implementations

We audited the three repos that appeared alongside the paper (see docs/RUNS.md). This is the only one that: runs on a real agent stack (Hermes), gates skills through a fully isolated profile, ships verbatim Appendix E prompts, and has a live-verified end-to-end loop (maintainer → proposer → gate → rollback).

Agent backends

The loop runs on any supported agent CLI — the raw/wiki/skill layers are backend-agnostic (issue #13).

Each workspace pins its backe