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Iterate Until Verified

Free

Enhance task execution with rigorous verification loops.

by mengto4.6k stars on mengto/skills
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Updated Aug 9, 2026
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Free · Opens the source repo

What Iterate Until Verified does

The Iterate Until Verified skill is designed to improve the execution and verification of substantial tasks by applying a structured workflow that preserves the original request. This skill is particularly useful for developers and designers who need to ensure that their outputs meet specific quality standards while maintaining the integrity of the initial task. By using this skill, users can systematically break down complex tasks into manageable workstreams, assign clear ownership, and implement rigorous verification processes to achieve high-quality results.

At its core, the skill emphasizes the importance of a task contract, which includes key elements such as expected outcomes, audience considerations, and constraints. This contract serves as a guiding document throughout the execution process, ensuring that the original intent of the task is not lost. The skill also introduces an acceptance matrix that translates subjective quality criteria into observable checks, allowing users to evaluate their work against defined standards.

The workflow includes a loop that allows for continuous improvement, where tasks can be refined based on feedback from independent verifiers. This separation of roles between implementers and verifiers helps to ensure that the final output is critically assessed and meets all specified quality gates. The skill encourages a disciplined approach to task management, fostering accountability and thoroughness in the execution process.

Overall, Iterate Until Verified is an essential tool for professionals who prioritize quality and rigor in their work, making it suitable for a variety of contexts where verification and iterative improvement are crucial.

When to use it

Use this skill when you need to execute substantial tasks that require multiple workstreams and rigorous quality checks.

When not to use it

This skill may not be suitable for simple tasks that do not require detailed verification or for scenarios where speed is prioritized over quality.

What you can build with it

Software Development

Use this skill to manage complex software projects, ensuring that all components are rigorously tested and verified before integration.

Content Creation

Apply this skill to writing tasks where multiple drafts or revisions are needed, allowing for independent review and quality checks.

Design Projects

Utilize this skill in design workflows to maintain high standards of quality and consistency across different design elements.

How to install Iterate Until Verified

View source

1. Install with the skills CLI

npx skills add mengto/skills/iterate-until-verified --agent claude-code

2. Or install it manually

Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.

Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs

Inside SKILL.md

Written by mengto

Iterate Until Verified

Preserve the task. Strengthen the process around it.

Choose the mode

  • Execute: Complete the original task with the workflow below. Use this mode by default.
  • Compose: When the user asks for an improved prompt rather than the finished work, return a reusable prompt wrapper. Keep the original task authoritative and unchanged inside the wrapper.

Do not silently switch from composing a prompt to executing it.

1. Lock the original task

Extract:

  • outcome and deliverables
  • audience and use case
  • supplied inputs and references
  • constraints, tools, formats, and exclusions
  • authorized actions and protected boundaries
  • explicit definition of done

Treat these as the task contract. Do not replace the subject, invent requirements, relax constraints, expand permissions, or let the verification method become the deliverable.

Ask a question only when a missing answer would materially change the work and cannot be discovered safely. Otherwise, state a reasonable assumption and proceed.

2. Convert ambition into gates

Translate words such as perfect, best, professional, production-ready, or AAA into observable checks. Select only the dimensions relevant to the task:

  • correctness and factual accuracy
  • completeness against the request
  • craft, clarity, and audience fit
  • usability and accessibility
  • robustness, edge cases, and regression safety
  • performance, security, or compliance
  • visual, editorial, or technical fidelity to a supplied benchmark

Create a compact acceptance matrix:

GateVerification methodPass conditionEvidence
Relevant quality dimensionTest, inspection, comparison, or read-backObservable binary conditionCommand, source, screenshot, output, or artifact

Prefer pass/fail conditions over vague scores. A strong reaction such as “wow” may be a useful signal, but it is never the only gate.

3. Decompose and assign

Split the task into the smallest meaningful workstreams with clear ownership, inputs, outputs, and integration boundaries.

  • Fan out only workstreams that are genuinely independent.
  • Keep coupled edits with one owner to avoid racing changes.
  • Give each worker the original task contract and only the context it needs.
  • Require every worker to return an artifact or evidence, not a confidence claim.
  • Keep one integrator responsible for cross-workstream consistency and regressions.

Use subagents or delegated workers when they are available, permitted, and useful. Otherwise, perform the workstreams sequentially while preserving the same ownership boundaries.

4. Separate making from judging

Do not let an implementer be the sole approver of its own work.

Give the verifier:

  • the original task contract
  • the acceptance matrix
  • the candidate artifact
  • the relevant benchmark or source material

Withhold the implementer’s rationale and self-assessment unless the verifier needs them to reproduce a check. Instruct the verifier to find failures first, cite evidence, reject unsupported claims, and return a gate-by-gate verdict.

For blind comparison:

  • anonymize and randomize candidates when practical
  • compare like with like using the same conditions
  • keep the evaluator blind to author or candidate identity, not to the task or rubric
  • do not call a comparison blind when obvious identity cues remain

5. Match proof to the work

Use the strongest verification surface available:

  • Code: focused tests, typechecks, builds, linters, security checks, runtime behavior, and regression tests.
  • Visual work: rendered output at relevant sizes, interaction checks, accessibility checks, and side-by-side comparison with an accessible reference.
  • Research or analysis: primary sources, reproducible calculations, citation checks, and contradiction searches.
  • Writing: factual checks, brief coverage, audience fit, structure, and an editorial pass against representative references.
  • Plans or decisions: constraint coverage, dependency checks, failure scenarios, feasibility, and explicit tradeoffs.
  • External actions: exact target resolution followed by post-action read-back.

Never substitute a self-rating for evidence. Never invent a benchmark, source, test result, screenshot, or blind verdict.

6. Run the loop

Repeat:

  1. Produce or improve the candidate.
  2. Run every applicable gate.
  3. Record pass, fail, or blocked with evidence.
  4. Route each failure to the responsible workstream.
  5. Make the smallest revision that addresses the evidence.
  6. Re-run the failed gate and any affected regression gates.
  7. Integrate only verified work.

Continue while required gates fail and a safe, in-scope action can make meaningful progress. Do not churn on the same approach after repeated failure; change the approach or report the blocker.

7. Stop honestly

Finish only when:

  • every required gate passes
  • the integrated result still satisfies the original task
  • regressions relevant to the changed work have been checked
  • evidence supports the final claims
  • remaining unknowns are disclosed

Stop as blocked when a required gate depends on missing access, unavailable inputs, new authority, or an infeasible constraint. Name the exact blocker and the minimum next action. Do not weaken a gate merely to declare success.

Compose mode template

When returning an enhanced prompt, use this shape:

Use an iterative execution-and-verification workflow around the authoritative task below.

AUTHORITATIVE TASK
<preserve the user's original task here without changing its subject, deliverables, or constraints>

PROCESS
1. Extract the task contract and convert subjective quality language into observable acceptance gates.
2. Decompose independent workstreams and fan them out when delegation is useful and permitted.
3. Keep one integrator responsible for consistency.
4. Assign an independent verifier that sees the task, rubric, candidate, and references—but not the implementer's self-assessment.
5. Verify with task-appropriate evidence. Use anonymized side-by-side comparison when a real comparable benchmark exists.
6. Route failed gates back to the responsible workstream, revise, and re-check affected regressions.
7. Do not finish until every required gate passes or a concrete blocker is proven.

FINAL RESPONSE
Return the deliverable, a concise gate-by-gate evidence summary, and anything still unverified. Do not claim checks that were not run.

Adapt the process to the task. Do not copy domain-specific tools, benchmarks, or quality claims from another prompt unless they apply here.

Completion checks

  • The original task remains authoritative.
  • Subjective ambition became observable gates.
  • Independent work was separated without creating racing edits.
  • Making and judging were assigned to different roles.
  • Benchmarks were real, comparable, and honestly labeled.
  • Failed gates drove revisions.
  • The final claims match the collected evidence.

Frequently asked questions about Iterate Until Verified

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