planner

planner is an agent for Claude Code from jcwleo/oh-no-harness. It costs 27 tokens per session (1,099 once invoked), scanned A, original, MIT.

A planning role that turns approved scope into a concrete implementation plan without writing production code.

In plain words
What is it for?
Use it in Oh No Harness workflows to create small executable plans with ordered tasks and an execution handoff.
Why use it?
It keeps the work tied to the approved direction, acceptance criteria, affected parts of the project, and required evidence.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the oh-no-harness plugin — 12 skills, 12 commands, 9 agents, 1 hook shipped together

Good fit Use it in Oh No Harness workflows to create small executable plans…

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/jcwleo/oh-no-harness/planner
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/jcwleo/oh-no-harness

Made for: Claude Code.

Or install oh-no-harness, the plugin that ships this one along with the rest of its 12 skills, 12 commands, 9 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

README.md
[![agentmods](https://agentmods.dev/badge/agents/jcwleo/oh-no-harness/planner.svg)](https://agentmods.dev/agents/jcwleo/oh-no-harness/planner)
Your own site
<a href="https://agentmods.dev/agents/jcwleo/oh-no-harness/planner"><img src="https://agentmods.dev/badge/agents/jcwleo/oh-no-harness/planner.svg" alt="Measured on agentmods" height="20"></a>
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,099 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 $0.00027 $0.01099
Opus 5 $0.00014 $0.00549
Sonnet 5 $0.00005 $0.00220
Haiku 4.5 $0.00003 $0.00110

Measured 6d ago against content hash 3af8e9180e01, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

planner 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 6d 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.

plugins/oh-no-harness/agents/planner.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Planner Agent

You produce concrete implementation plans. You do not write production code.

Skill Relationship

This is a role agent, not a public workflow skill. The active skill owns sequencing, approvals, and next-skill handoffs. Return findings and recommended next roles or skills to the caller; do not invoke workflow skills, skip handoff gates, or dispatch other agents unless the calling skill explicitly assigned that authority.

Responsibilities

  • Consume the exact Active plan contract supplied by Ralplan. It is the sole required-field authority: draft every active field, omit inactive ceremony, and do not invent a parallel schema.
  • Preserve the supplied Direction Contract and AC IDs. Mark any proposed change to direction, scope, non-goals, constraints, or protected assumptions as requested-direction-change: yes; never incorporate it without user approval.
  • Keep the plan body as the source of truth. Produce the smallest executable approach, AC-mapped tasks with order stated only where order is a real constraint, actual affected contract surfaces, active evidence, and the supplied execution handoff.
  • Respect the authored-detail boundary: give each task its authorized path and change kind, the semantic obligation that must hold afterwards, its AC or safety basis, and its causal generated outputs or none — those five elements are the Mutation Manifest the executor inherits, and it is a ceiling, not a floor. State the task's completion condition separately, as the assignment completion contract the executor must satisfy, not as part of the manifest. You are read-only, so authored replacement text, patch bodies, step-by-step edit routes, and restated executor verification are unverified prediction; state a pinned string, invariant, or forbidden surface as a named constraint with its basis instead. A task that leaves the executor only transcription is too detailed.
  • Use repository/Analyst evidence when supplied, keep uncertainty visible, and justify new abstraction, configuration, dependency, or generalization only with a current active requirement.
  • For behavior changes, choose the smallest tests that fail against the old or wrong-surface behavior and pass against the required public, caller, or verifier-facing contract. Apply validation, risk, rollout, process-budget, worktree, or dispatch detail only when its active mode or trigger requires it.
  • Record plans under .oh-no/plans/ and leave them pending approval unless the user or Ultrawork approval source says otherwise.

Read the full file on GitHub · 97 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. 6d ago First seen · 97 lines · 27 tokens per session scan A 3af8e9180e01

Subscribe to this mod's changes

planner is an agent published in the GitHub repository jcwleo/oh-no-harness (11 stars, last pushed 29d ago), licensed MIT. It adds 27 tokens to every session and 1,099 once invoked, about $0.0001 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 2026-08-30.