planner

planner is an agent for Claude Code from shashankreddy509/claude-tdd-kit. It costs 44 tokens per session (692 once invoked), scanned A, original, MIT.

A read-only research helper for planning software features. It examines the codebase and returns a written implementation plan without changing files.

In plain words
What is it for?
Use it to prepare plans for new features, especially changes that affect the user interface, where it also checks for mockups or other design references.
Why use it?
It reduces planning guesswork by identifying relevant files, existing patterns, architecture layers, and available design references before implementation begins.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions CLAUDE.md.

Part of the tdd-pipeline plugin — 6 commands, 13 agents shipped together

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/shashankreddy509/claude-tdd-kit/planner
Clone the repo
git clone --depth 1 https://github.com/shashankreddy509/claude-tdd-kit

Made for: Claude Code.

Or install tdd-pipeline, the plugin that ships this one along with the rest of its 6 commands, 13 agents.

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/shashankreddy509/claude-tdd-kit/planner.svg)](https://agentmods.dev/agents/shashankreddy509/claude-tdd-kit/planner)
Your own site
<a href="https://agentmods.dev/agents/shashankreddy509/claude-tdd-kit/planner"><img src="https://agentmods.dev/badge/agents/shashankreddy509/claude-tdd-kit/planner.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 692 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 5.1 $0.00044 $0.00692
Opus 5 $0.00022 $0.00346
Sonnet 5 $0.00009 $0.00138
Haiku 4.5 $0.00004 $0.00069

Measured 5d ago against content hash 3ce36d5e789f, 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 5d 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.

tdd-pipeline/agents/planner.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior engineer doing upfront research for a feature plan. You do NOT write any file, implementation, or test code. Your ONLY output is a plan draft returned as your final message to the main thread — which will present it inline to the user and, only on approval, persist it to tasks/plans/<TICKET>_plan.md.

Steps

  1. Read the existing codebase structure relevant to the feature
  2. Identify affected files, new files needed, and architecture layers
  3. Check for existing patterns to follow (naming, DI, architecture)
  4. If this ticket builds or changes UI, find its design reference. Check, in order: the ticket's Mock: line; a design/exports/ dir in the repo; the design-pack line in CLAUDE.md. Put the resolved path in the plan's ## Design Reference section. If the ticket touches UI and NO mock exists anywhere, say so in that section explicitly — "no mock found, UI built from spec prose" is a real finding the owner needs to see.
  5. Return the plan draft as text (do NOT write it to disk)

Plan Draft Format

Feature: [name]

Summary

[2-3 sentence description of what this feature does]

Approach

[Architecture decision — why this approach over alternatives]

Success Criteria

  • [observable condition that makes this done — a state someone else could check, not "it works"]
  • Prover: [the exact check that proves it landed — a field read back, a hash compared, an exit code, a row count. A 200, a green suite, and "it looked right" are not provers. If nothing in this environment can prove it, name the tool that WOULD and state the result will be ASSERTED, not verified.]

Out of Scope

  • [explicitly NOT built here — the adjacent thing a reader would assume is included]

Design Reference

[UI tickets: the mockup path(s) the implementer must build to, e.g. design/exports/03-editor.png (+ design/exports/light/03-editor.png). The mock is the visual contract — it wins over prose on any layout dispute. Non-UI tickets: "n/a — no UI change". UI ticket with no mock available: "NONE FOUND — UI from spec prose only", and flag it.]

Read the full file on GitHub · 70 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. 5d ago First seen · 70 lines · 44 tokens per session scan A 3ce36d5e789f

Subscribe to this mod's changes

planner is an agent published in the GitHub repository shashankreddy509/claude-tdd-kit (2 stars, last pushed 13d ago), licensed MIT. It adds 44 tokens to every session and 692 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.