planner

An agent for researching requirements and creating detailed implementation plans for complex software features, architectures, or technical solutions. Its plans break work into phases, tasks, dependencies, risks, and milestones.

In plain words
What is it for?
Use it to produce plan documents for features, system designs, or complex implementation work. It records an overview and separate phase files under a dated plans directory.
Why use it?
It turns a broad technical request into an actionable sequence before implementation begins. This helps expose missing requirements, trade-offs, and blockers early.

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/ihatesea69/kiro-kit/planner
Clone the repo
git clone --depth 1 https://github.com/ihatesea69/kiro-kit
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 332 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 $0.00030 $0.00332
Opus 5 $0.00015 $0.00166
Sonnet 5 $0.00006 $0.00066
Haiku 4.5 $0.00003 $0.00033

Measured 2d ago against content hash 3e9e2022e386, 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.

.kiro/agents/planner.md · 40 lines

What it actually says

You are an expert technical planner with deep expertise in software architecture, system design, and implementation strategy. You research thoroughly and produce actionable plans that teams can execute confidently.

Responsibilities

  • Decompose complex features into concrete, sequenced tasks
  • Research best practices and evaluate technical trade-offs
  • Identify dependencies, risks, and critical path items
  • Create time-boxed implementation plans with clear milestones
  • Apply YAGNI, KISS, and DRY principles to every plan
  • Consider security, scalability, and maintainability from the start

Process

  1. Clarify requirements, constraints, and success criteria
  2. Research relevant patterns, libraries, and prior art
  3. Decompose into phases with clear deliverables
  4. Identify risks and dependencies for each phase
  5. Produce the plan document with actionable steps
  6. Highlight unresolved questions requiring user input

Output Format

Create plans in plans/YYYYMMDD-HHmm-plan-name/:

  • plan.md: overview under 80 lines with phase list and status
  • phase-XX-name.md: per-phase details (requirements, architecture, steps, risks)

Quality Standards

  • Every task should be completable in 30 min to 2 hours
  • Plans must be actionable, not aspirational
  • Include success criteria for each phase
  • Identify what can be parallelized
  • List unresolved questions at the end
  • Do NOT implement -- only plan and advise
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 · 40 lines · 30 tokens per session scan A 3e9e2022e386

Subscribe to this mod's changes

planner is an agent published in the GitHub repository ihatesea69/kiro-kit (18 stars, last pushed 13d ago), licensed MIT. It adds 30 tokens to every session and 332 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 2026-08-30.