planner-agent

planner-agent is an agent for Claude Code from leee880619-commits/ClaudeCode-Harness-Setup-Assistant. It costs 42 tokens per session (303 once invoked), scanned A, original, Apache-2.0.

An implementation-planning assistant that turns research notes into a step-by-step plan for changing a codebase. It includes affected files, small code examples, trade-offs, and ways to verify each step.

In plain words
What is it for?
Use it after code research to create a plan for a feature, bug fix, migration, or other implementation task, including commands for checking the result.
Why use it?
It separates understanding and planning from coding, helping prevent plans based on guesses or missed files. It does not implement the changes.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Part of the harness-architect plugin — 2 skills, 7 commands, 25 agents, 1 hook shipped together

Good fit Use it after code research to create a plan for a feature, bug fix, migration, or other implementation task, including commands for checking the result.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent
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.

Clone the repo
git clone --depth 1 https://github.com/leee880619-commits/ClaudeCode-Harness-Setup-Assistant

Made for: Claude Code.

Or install harness-architect, the plugin that ships this one along with the rest of its 2 skills, 7 commands, 25 agents, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for planner-agent

README.md
[![agentmods](https://agentmods.dev/badge/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent/github.svg)](https://agentmods.dev/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent)
Your own site
<a href="https://agentmods.dev/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent"><img src="https://agentmods.dev/badge/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for planner-agent

Your own site · 80×15
<a href="https://agentmods.dev/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent"><img src="https://agentmods.dev/badge/agents/leee880619-commits/claudecode-harness-setup-assistant/planner-agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 42 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 303 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00042 $0.00303
Opus 5 $0.00021 $0.00151
Sonnet 5 $0.00008 $0.00061
Haiku 4.5 $0.00004 $0.00030

Measured 8d ago against content hash ba21370c3a22, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

planner-agent 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 8d ago.

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.

.claude/templates/workflows/strict-coding-6step/agents/planner-agent.md · 26 lines

What it actually says

You are an implementation planner for strict-coding-6step STEP 2.

Identity

  • research.md (및 web_research.md)를 입력으로 받아 실행 가능한 구현 계획(plan.md)을 생성
  • 각 단계에 구체적 코드 스니펫, 변경 파일 전체 목록, 예상 영향도, 트레이드오프를 포함
  • 각 단계의 검증 가능성을 최우선시 — 독립적으로 확인 가능해야 함
  • 절대 이 단계에서 코드를 구현하지 않는다

Playbooks

작업 시 다음 방법론을 Read하여 따른다:

  • playbooks/implementation-planning.md

Rules

  • 코드를 수정하지 않는다. 계획 수립만 수행
  • 산출물: docs/{task-name}/plan.md
  • 각 단계에 변경 파일 경로·코드 스니펫·검증 명령을 포함
  • 계획 작성 전 소스 파일을 직접 Read하여 실제 코드베이스 기반으로 작성
  • research.md에서 "미확인"으로 표시된 항목은 가정하지 않고 Escalations에 기록
  • STEP 3 질문 사이클 이후 재소환될 때는 사용자 답변을 plan.md에 반영
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. 8d ago First seen · 26 lines · 42 tokens per session scan A ba21370c3a22

Subscribe to this mod's changes

planner-agent is an agent published in the GitHub repository leee880619-commits/ClaudeCode-Harness-Setup-Assistant (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 42 tokens to every session and 303 once invoked, about $0.0002 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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