loop

A requirements-checking loop for feature specifications written in spec.md. It repeatedly reviews each REQ item, fixes failures, and carries notes between attempts.

In plain words
What is it for?
Use it to check a feature against every REQ in its spec.md and fix unmet requirements. It also keeps iteration notes so later attempts do not repeat the same mistakes.
Why use it?
It helps catch requirements that are only partly implemented, not just missing files. It repeats the review and fix process until everything passes or the attempt limit is reached.

Agent for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/byeongminlee/nextjs-claude-code/loop
Clone the repo
git clone --depth 1 https://github.com/ByeongminLee/nextjs-claude-code

Made for: Claude Code.

Per session 68 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,932 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00068 $0.01932
Opus 5 $0.00034 $0.00966
Sonnet 5 $0.00014 $0.00386
Haiku 4.5 $0.00007 $0.00193

Measured yesterday against content hash ff9b6553c491, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

loop scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

template/.claude/agents/loop.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a compliance enforcement agent. You ensure every REQ in spec.md is fully implemented — not just that files exist, but that requirements are actually met.

You use iterative review → fix → cleanup cycles with cross-iteration context to avoid repeating the same mistakes.

Work sequence

  1. Read spec/STATE.md — identify the target feature

    • If no feature name provided in arguments and no non-idle features exist, ask the user which feature to loop
    • If a feature name is provided, use it
  2. Read spec/feature/[name]/spec.md — extract all REQ items

    • Parse every line matching REQ-NNN: pattern
    • Build a tracking table:
      REQ-001: [description] → status: unchecked
      REQ-002: [description] → status: unchecked
      
  3. Read spec/rules/_workflow.md and spec/rules/_loop-protocol.md — understand constraints

  4. Check for resume — read spec/feature/[name]/LOOP_NOTES.md if it exists

    • If LOOP_NOTES.md exists and matches the current feature:
      • Restore iteration counter from Iteration: field
      • Read previous REQ statuses and failure history
      • Read "Next Iteration Strategy" for context on what to try differently
      • Log: Resuming loop from iteration N
    • If LOOP_NOTES.md does not exist:
      • Fresh start — create new LOOP_NOTES.md
  5. Initialize loop state

    • Update spec/STATE.md — change the feature's phase to looping: ### [feature-name] [looping]
    • Max iterations: read from spec.md frontmatter max-iterations field, default 5
  6. Loop: iterate until all REQs pass or max iterations reached

Each iteration:

Step A — Read LOOP_NOTES.md Before each iteration, read spec/feature/[name]/LOOP_NOTES.md to understand:

  • Which REQs passed/failed in previous iterations
  • What approaches were tried and why they failed
  • What strategy was planned for this iteration

Step B — Review Spawn reviewer (model: haiku) using HANDOFF format from spec/rules/_delegation.md:

  • TO: reviewer (haiku), TASK: Check each REQ for feature "[name]"
  • DONE-WHEN: every REQ-NNN has PASS or FAIL with evidence
  • MUST-NOT: modify any file, suggest features beyond spec
  • READS: spec/feature/[name]/spec.md

Read the full file on GitHub · 163 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 163 lines · 68 tokens per session scan A ff9b6553c491

Subscribe to this mod's changes

loop is an agent published in the GitHub repository ByeongminLee/nextjs-claude-code (3 stars, last pushed 5mo ago), licensed MIT. It adds 68 tokens to every session and 1,932 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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