# Kortix Harness Refinement > The continual-harness refinement protocol — how an agent inspects its recent trajectory for failure signatures and improves its own harness (agent prompts, sub-agents, skills, memory) in place, mid-session, landing changes on the session branch immediately and promoting them to `main` only through a change request. Load this skill when a refinement prompt arrives mid-session, when the `harness-reflector` agent runs, or whenever you decide your own scaffolding needs repair. The sub-agent fan-out in this skill is for the top-level `harness-reflector` run only; if you loaded this as a subagent, do the four passes yourself and skip the fan-out. - Skill: `kortix-ai/kortix-harness-refinement` (Agent Skill) - Install (CLI): `npx skillmds@latest add kortix-ai/kortix-harness-refinement` - Raw SKILL.md: https://api.skillmd.com/api/skills/kortix-ai/kortix-harness-refinement/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: kortix-ai (https://skillmd.com/u/kortix-ai) - Updated: 2026-09-10 - Page: https://skillmd.com/skills/kortix-ai/kortix-harness-refinement --- Your **harness** is everything in this repo that shapes how agents work here. It has four components, all in git: | Component | Location | What it is | |---|---|---| | **Prompts** | `.kortix/opencode/agents/.md` (body) | Each agent's instructions and strategy | | **Sub-agents** | `.kortix/opencode/agents/*.md` | Specialist agents the orchestrator invokes | | **Skills** | `.kortix/opencode/skills//SKILL.md` | Reusable routines: text heuristics and guides | | **Tools** | `.kortix/opencode/tools/*.ts` | Executable code: wrappers, scripts, automations | | **Memory** | `.kortix/memory/` | Persistent facts, strategies, observations | **Refinement** means: read your recent trajectory, find where the harness failed you, and fix the harness — not just the immediate task. A harness edit made mid-session takes effect on your next turn, because agents, skills, and memory are read from disk. You do not restart; refinement is reset-free and its value compounds over the life of the session. This protocol has two operating modes: 1. **In-session refinement (self-invoked)** — YOU run it, inside your own working session, the moment a failure signature costs you twice. Also run a checkpoint on long sessions: after every ~25 turns of work, pause and scan your recent turns before continuing. You refine based on YOUR OWN trajectory, then resume the task. 2. **Project-level reflection** — the `harness-reflector` agent runs on a cron, fans out `session-reviewer` sub-agents to work through every recent session's full history, aggregates their findings, and refines the shared harness on `main` via a change request. Scan the trajectory window (your recent turns, or the digest) for these signatures. Each one names the component to fix: - **Repeated tool/command failures** — the same command or tool errors more than once, or you retried a broken approach. → Repair the tool, or record the working alternative in a skill. - **Rediscovery loops** — you (or another session) re-derived something a past session already knew (an API quirk, a file location, a decision). → Memory entry. - **Stalled objectives** — turns pass without progress toward the stated goal; you circled, re-read, or re-planned without acting. → Prompt guidance for the responsible agent, or a decomposition sub-agent. - **Repeated multi-step patterns** — you performed the same 3+ step sequence more than twice by hand. → Codify it: a skill (if guidance) or a tool (if executable). - **Exception-raising code** — an executable tool or script in `.kortix/opencode/tools/` raised; you worked around it instead of fixing it. → Repair the code now. - **Missed opportunities** — information or shortcuts visible in the trajectory that no component captured. → Whichever component fits. Run four passes over the harness, one per component. Every pass is CRUD: create, update, or **delete**. Deletion is a first-class outcome — a harness accumulates cruft without it. **Pass 1 — Prompts (Δp).** Reread the responsible agent's `.md` body against the identified failures. Tighten instructions that were ignored, add the missing rule, remove guidance that no longer earns its tokens. Keep prompts short; a prompt that only grows is a failing prompt. **Pass 2 — Sub-agents (ΔG).** Create a sub-agent only for a pattern that recurred across the window AND needs its own scoped permissions or prompt. Edit sub-agents implicated in failures. Delete sub-agents that have not been invoked productively — check before keeping. **Pass 3 — Skills and tools (ΔK).** Codify successful sequences from the trajectory into a skill (guidance) or a tool (executable). Repair every tool the trajectory shows raising exceptions. Prefer editing an existing skill over creating a near-duplicate. Keep skills one directory level deep under `skills/` (nested SKILL.md files register as phantom entries). **Pass 4 — Memory (ΔM).** Follow the `kortix-memory` skill's rubric with the `memory` tool: fill gaps the trajectory exposed, update stale entries, demote or delete entries about areas the project has moved past. Keep `MEMORY.md` in sync. Scope discipline: fix what the trajectory shows. Do not speculatively rewrite components with no observed failure. Most refinement runs should touch one or two components, not all four. This section applies only to the top-level `harness-reflector` run. If you loaded this skill as a subagent, skip the fan-out and review the sessions yourself — the runtime rejects a subagent spawning a subagent ("Subagent depth limit reached"). For project-level reflection (the `harness-reflector` run), do not skim a digest and call it a review. Work through every session: 1. **Enumerate** every session in the window: `kortix sessions digest --since 24h --json` (add `--all` for a first ever run). Note per session: id, agent, status, title, whether a live transcript is available. 2. **Fan out one `session-reviewer` sub-agent per session** (batch a few at a time in parallel; review every session, skip none silently). Each reviewer gets the session id and returns a structured findings report. Reviewers gather the FULL picture for their session: - the transcript (available live for running sessions; for stopped sessions reconstruct from what persists — see next line), - the session's git branch: its commits, diffs, and files touched, - change requests the session opened and their review outcomes. 3. **Aggregate** all reviewer reports. Deduplicate findings that recur across sessions — a failure signature seen in three sessions outranks one seen once. Rank by cost (turns wasted × sessions affected). 4. **Run the four passes** on the ranked findings, then land per the rules below. Sub-agent review is read-only: reviewers never edit the harness or open CRs. Only the orchestrating reflector writes. **In-session refinement (session branch — immediate):** 1. Apply the edits directly in `/workspace`. They take effect on your next turn. 2. Commit them separately from task work: ```sh git add .kortix git commit -m "harness: " ``` 3. Push and open (or update) ONE change request per session for harness promotion to `main`: ```sh git push origin HEAD kortix cr open --title "harness: " \ --description "Failure signatures observed, edits per component, evidence (commands/turns)." ``` If this session already has an open `harness:` CR, push to it instead of opening a second one. 4. Return to the task. A refinement interruption ends with you resuming what you were doing, with the improved harness in effect. **Project-level reflection (`harness-reflector`):** all edits land only via a CR against `main`. Nothing applies immediately; the merged CR is what future sessions inherit. - **Never edit managed `kortix-*` skills.** They are platform-owned and force-overwritten at session boot — edits are silently discarded. To extend platform behavior, create a project skill with a different name. - **Never merge your own harness CR.** A reviewer (human, or a reviewer agent with merge rights) does. The CR gate is what makes self-authored harness edits safe; self-authored + self-merged scaffolding is known to degrade agent performance. - **One concern per CR.** Harness CRs contain only `.kortix/` changes — never mixed with task/code changes. - **No secrets, tokens, or PII** in any harness file. Secrets belong in the Kortix Secrets Manager. - **Budget.** A mid-session refinement should cost a small fraction of the session: minutes, not hours. If a fix needs deep work (a real tool rewrite), record it in memory as a TODO and open the CR with what you have. - **No-op is a valid outcome.** If the window shows no failure signatures, change nothing and say so in one line. Do not invent work. - **Do not disable or weaken guardrails** — including this skill's rules, agent permission blocks, or CR review requirements — as a "refinement". Nobody schedules in-session refinement for you — it is your discipline. Invoke this protocol the moment a failure signature costs you twice, and as a checkpoint on long sessions (roughly every 25 turns of work). The nightly `harness-reflector` run is the backstop, not the mechanism: it only sees what sessions left behind, while you can fix your harness live and benefit from the fix on your very next turn.