LOOPcodingfeaturesevidencetestingloop

Evidence-First Feature Delivery Loop

A bounded coding loop for shipping one feature slice only after the agent proves the current contracts, risks, and user path.

Prompts capture what to ask. Playbooks capture repeatable methods. Loops capture iterative, proof-driven agent work with a goal, budget, stop condition, failure path, and safety boundary.

June 24, 2026BurmCode

TRIGGER

Run when a feature request can be split into one small delivery slice and guessing about APIs, data contracts, or user behavior would create risk.

GOAL

Ship one bounded feature slice whose assumptions are backed by current repository evidence and verified with relevant checks.

STOP CONDITION

Stop when the slice is implemented and verified, when inspection changes the scope, when approval is required, when checks cannot prove the result, or when three attempts fail to make progress.

ITERATION

Action / Observe / Evaluate

Inspect current contracts, state the evidence and risks, implement only the supported slice, run focused checks, manually verify affected user states when present, then stop with one next recommended slice.

VERIFY / PROOF

Evidence Gate

Require repository evidence for APIs, data shapes, affected files, persistence behavior, and user states. The final result must include command output summaries, manual verification notes when applicable, and a list of anything not proved.

STATE / MEMORY

Memory Contract

Read project instructions, previous slice notes, known risks, current contracts, and validation history. Write the slice evidence, changed files, verification results, limits, and the next recommended slice.

TOOLS

GitGitHubTypeScriptJestVitestPlaywrightDatabaseAPI clientBrowser

MODELS

gpt-5.3-codexclaude-sonnet-4.5

BUDGET

One feature slice, up to three implementation attempts, or 90 minutes, whichever comes first.

FAILURE HANDLING

No-Progress And Unsafe States

If a check fails, identify whether it is caused by the slice or pre-existing state. Fix only slice-caused failures. If a contract is missing or contradictory, stop and report the blocker instead of inventing behavior.

SAFETY CONSTRAINTS

Boundary Conditions

Do not overwrite unrelated work, invent APIs, silently persist user data, touch production systems, expose secrets, delete user data, change public contracts, or continue into another slice without approval.

EXAMPLE OUTPUT

Expected Public Result

Decision: pass. Slice: invite resend button. Evidence: existing invite service, permission guard, pending invite state, and toast pattern. Checks: unit test and Playwright path passed. Limit: email provider was mocked. Next slice: add rate-limit copy.

INSTRUCTIONS

Loop Method

Use this loop when a feature is too large or too risky to hand to an agent as one open-ended task. The loop forces the agent to pick one slice, inspect the real code and contracts, then prove the result before moving on.

The point is simple: no invented APIs, no hidden persistence changes, no silent scope creep.

Pre-flight:

1. Define the feature slice. Name the smallest user-visible or system-visible change that can be reviewed on its own.
2. Read the project instructions, current implementation, service boundaries, routes, types, data models, tests, and relevant docs before editing.
3. Record the evidence. List the files, functions, endpoints, schemas, UI states, and tests that support the planned change.
4. State the risk. Call out persistence effects, auth or permission checks, external services, migrations, destructive behavior, privacy concerns, and anything that changes what users can see or save.
5. Decide the verification plan. Include repository checks and a manual user-path check when the change affects the product surface.
6. Stop for approval if the inspection changes the requested scope or reveals a production, destructive, privacy-sensitive, or silent-persistence change.

Iteration cycle:

1. Implement only the supported slice.
2. Preserve unknown fields, existing round-trip behavior, user data, routes, public contracts, and unrelated work.
3. Avoid broad abstractions unless the current code already uses that pattern and the slice needs it.
4. Run the relevant tests, type checks, lint checks, builds, or targeted commands.
5. Manually verify user-facing states where they exist: loading, empty, error, stale, save, reload, and cleanup.
6. Record what passed, what failed, what was unavailable, and what remains unproven.
7. Stop after the slice. Recommend the next slice, but do not begin it without a new request.

Quality rules:

- Do not invent endpoints, request shapes, database fields, or framework behavior.
- Do not quietly autosave, overwrite, delete, migrate, publish, email, charge, or call production systems.
- Do not treat a screenshot or preview as proof unless it reflects the same state users will get from the source of truth.
- If a check cannot run, say why and keep the result limited.
- If the implementation requires a larger change than expected, stop and explain the new scope.

Recommended final report:

- Feature slice attempted
- Evidence read before editing
- Files changed
- Contract or persistence impact
- Verification commands and results
- Manual user-path evidence
- Unavailable checks or pre-existing failures
- Risks and limits
- One recommended next slice

Published by BurmCode

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