epoch

name	epoch
description	Multi-round optimization loop for improving prompts, rules, hyperparameters, and code through evidence-based iteration. Use this skill when the user mentions "epoch" or invokes /epoch. Reads a epoch_run.yaml config to determine task type and dispatches to the appropriate workflow.

EPOCH: Multi-Round Optimization

EPOCH runs an iterative optimization loop: Investigate failures, implement a fix, evaluate the result, accept or reject with evidence, repeat.

When to Use

• User says "epoch", "run epoch", or uses /epoch
• User has a epoch_run.yaml config file
• User describes an optimization task in conversation

Quick Start

Config provided (e.g. /epoch projects/wine_run.yaml):

1. Read the project's epoch_run.yaml
2. If env is configured, ensure the environment is set up (e.g. uv sync in env.path). Wrap all commands (evaluation.cmd, evaluation.test_cmd, evaluation.train_cmd/evaluation.eval_cmd) with the env manager (e.g. uv run --project <env.path> <cmd>)
3. Identify task_type from config
4. Load the matching reference and active agents
5. Execute the workflow

No config (e.g. /epoch or "epoch, classify wine cultivars"):

1. Load references/create_project.md
2. Interview the user (3-5 questions max)
3. Generate projects/<slug>_run.yaml + scaffold project files using ONLY the templates in create_project.md — do NOT read or reference other project folders, and do NOT check git log or git history
4. Validate the scaffold runs
5. Confirm with user, then proceed with the generated config

---

Dispatch

Read epoch_run.yaml and dispatch based on run.task_type:

task_type	Reference to Load	Description
prompt_tune	references/prompt_tune.md	Optimize LLM prompts
finetune	references/finetune.md	Tune ML hyperparameters
rule_based	references/rule_based.md	Optimize rule-based systems
code_improvement	references/code_improvement.md	Fix bugs, optimize performance

If no config is provided, load references/create_project.md to interview the user and scaffold the project.

If task_type is not recognized, load references/create_skill.md to generate a new task-type reference.

---

Agents

Agents define role behavior, permissions, and constraints. Load them as needed during the workflow.

Agent	When to Load	Purpose
agents/orchestrator.md	Always	Coordinates rounds, manages branches and PRs
agents/seed_planner.md	Round 1	Designs baseline evaluation approach
agents/baseline_executor.md	Round 1	Implements evaluation infrastructure
agents/investigator.md	Rounds 2+	Analyzes failures, proposes changes
agents/executor.md	Rounds 2+	Implements changes, commits
agents/reviewer.md	Rounds 2+	Evaluates results, accepts/rejects

Users may add custom agents or exclude agents from this list based on their needs.

---

Shared Conventions

These apply across all task types.

Run ID and Branching

• Run ID: run-YYYYMMDD-HHMM
• Branch: epoch/<project_slug>/<run_id>/round-<N>
• One branch per round. Retries stay on the same branch.

Project Output Directory

Config and task files are organized as:

projects/
├── <slug>_run.yaml            # epoch config (sibling to task folder)
└── <slug>/                    # task folder
    ├── evaluate.py            # ML tasks: train/eval metric runner
    ├── tests/                 # code_improvement: test suite
    ├── rules/                 # or other task-specific files
    └── <run_id>/              # run artifacts
        ├── baseline_metrics.json
        ├── proposed_metrics.json
        ├── delta_round_N.json
        ├── pr_body.md
        └── run_summary.md

Never write outputs to the repository root.

PR Format

• Round 1: [Round 1] (Baseline: <metric>=<value>) Initial <artifact>
• Round 2+: [Round N] (<metric>: <old> -> <new>) <brief summary>

Acceptance Criteria

A round is accepted when:

1. Primary metric improves >= min_delta (from config)
2. No constraint violations (task-specific)
3. Evidence is provided (metrics table + rationale)

Rejection Requirements

Every rejection must include:

1. Metrics table with baseline, proposed, delta, threshold, status
2. Root cause — why the change didn't work
3. Retry recommendation — what to try differently

No subjective rejections. "Doesn't seem right" is not valid.

Retry Protocol

When a round is rejected and retries remain:

1. Read the rejection evidence (PR comments)
2. Analyze what failed and why
3. Choose strategy:
   • REFINE: Small regression + right direction — adjust magnitude
   • REVERT: Large regression + wrong direction — try different approach
4. Propose a different change than the previous attempt

TRAIN/EVAL Separation

For ML tasks (prompt_tune, finetune, rule_based):

• Investigation: TRAIN split only — never inspect EVAL data
• Evaluation: EVAL split only — metrics computed here
• This prevents overfitting to the evaluation set

For code_improvement: All tests are visible (no split).

---

Workflow Overview

Phase 1: Baseline (Round 1)

1. Read agents/seed_planner.md — design evaluation approach
2. Read agents/baseline_executor.md — implement and run baseline
3. Save baseline_metrics.json
4. Create branch, commit, push, open PR

Phase 2: Optimization (Rounds 2+)

For each round:

1. Branch setup: Create or reuse branch
2. Investigate: Read agents/investigator.md + task reference — analyze failures on TRAIN, propose changes
3. Implement: Read agents/executor.md — apply changes, commit, push
4. Evaluate: Read agents/reviewer.md — run EVAL, compare metrics, decide accept/reject
5. Handle decision:
   • Accept: Merge PR, proceed to next round
   • Reject + retries left: Retry on same branch
   • Reject + no retries: Close PR, proceed to next round

Completion

After all rounds, generate a run summary with the full metrics progression.

---

Configuration

Each project needs a epoch_run.yaml. The config structure differs by task type:

ML tasks (prompt_tune, finetune, rule_based) use evaluation: with train/eval split:

project:
  name: "Project Name"
  slug: "project_slug"

run:
  task_type: "rule_based"   # prompt_tune | finetune | rule_based
  max_rounds: 10
  max_retries_per_round: 2

env:
  manager: uv
  path: "projects/<slug>"

evaluation:
  primary_metric: "precision"
  min_delta: 0.01
  deterministic: true
  train_cmd: "python projects/<slug>/evaluate.py train"
  eval_cmd: "python projects/<slug>/evaluate.py eval"

git:
  push_to_remote: true
  create_prs: true
  target_branch: "develop"

Code improvement uses evaluation: with cmd (the program under test) and test_cmd (the test runner):

project:
  name: "Project Name"
  slug: "project_slug"

run:
  task_type: "code_improvement"
  max_rounds: 5
  max_retries_per_round: 1

env:
  manager: uv
  path: "projects/<slug>"

evaluation:
  primary_metric: "execution_time"
  min_delta: 0.05
  deterministic: true
  cmd: "python projects/<slug>/main.py"
  test_cmd: "pytest projects/<slug>/tests/"

git:
  push_to_remote: true
  create_prs: true
  target_branch: "develop"

Task-specific config sections (llm:, ml:, rules:) are documented in the corresponding reference file.

---

Discipline

1. No git archaeology during project creation — when creating a new project or generating a config yaml, do NOT run git log, git show, or any git history commands to look at past runs or projects. Start fresh from the templates and the user's input only.
2. One hypothesis per round — clear attribution of what caused the change
3. No scope creep — only modify what the investigation identified
4. Always re-run evaluation — never assume improvement
5. Every rejection must change strategy — no repeating the same approach
6. Small change, measure, decide, repeat
7. Project isolation — only read/modify files within projects/<slug>/ and projects/<slug>_run.yaml. Never scan, read, or reference other project folders — not even to "check patterns" or "follow conventions". Each project is scaffolded from the templates in create_project.md, not copied from siblings.