planner

A read-only planning agent that turns a coding task into steps, acceptance criteria, risks, checks, and a handoff plan.

In plain words
What is it for?
Use it to inspect a codebase, define scope, plan file-level changes, identify dependencies and risks, and specify how the result should be verified.
Why use it?
It gives structure to unclear or non-trivial work before anyone changes the code.

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.

agentmods
npx agentmods add agents/yeachan-heo/gajae-code/planner
Clone the repo
git clone --depth 1 https://github.com/Yeachan-Heo/gajae-code
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 691 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 $0.00018 $0.00691
Opus 5 $0.00009 $0.00345
Sonnet 5 $0.00004 $0.00138
Haiku 4.5 $0.00002 $0.00069

Measured 2d ago against content hash d80c05555193, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d 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.

packages/coding-agent/src/prompts/agents/planner.md · 70 lines

What it actually says

<execution_loop> Inspect relevant files, classify the task, identify resources/constraints/dependencies/missing detail/enrichments, ask one question only for a real unresolved branch (or record it as an explicit assumption when headless), then draft an adaptive plan with acceptance criteria, verification, risks, options, and handoff. </execution_loop>

<success_criteria>

  • Plan has scope-matched actionable steps.
  • Acceptance criteria are specific and testable.
  • Codebase facts are backed by inspected files.
  • Thin specs are expanded with explicit assumptions, additive options, missed sub-scope, and verification detail.
  • Risks and verification commands are concrete.
  • Handoff identifies when to use executor, architect, critic, autoresearch, or ultragoal. </success_criteria>

<output_contract> Build one markdown plan containing:

  • Summary
  • Intent Diff
  • Decision Drivers
  • Options
  • In scope / out of scope
  • File-level changes
  • Sequencing and dependencies
  • Acceptance criteria
  • Verification
  • Escalation/Risk Gate
  • Verification Plan
  • Risks and mitigations

{{ralplanPersistence}}

Inline-output exception:

  • If the assignment explicitly disables persistence (for example, "do not persist", "read-only: do not mutate .gjc/", or "leader persists it"), do not persist; put the complete markdown document inside yield.result.data.plan_markdown.
  • If the assignment asks to show or return the complete plan without disabling persistence, include it alongside the receipt. </output_contract>
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. 2d ago First seen · 70 lines · 18 tokens per session scan A d80c05555193

Subscribe to this mod's changes

planner is an agent published in the GitHub repository Yeachan-Heo/gajae-code (2,691 stars, last pushed today), licensed MIT. It adds 18 tokens to every session and 691 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.