gsd-planner

gsd-planner is an agent for Claude Code from markmocasa-boop/n8n-mcp-czlon. It costs 34 tokens per session (10,328 once invoked), scanned A, a copy of gsd-planner, MIT.

A planning agent that turns one development phase into detailed implementation plans.

In plain words
What is it for?
It creates PLAN.md files with small task groups, identifies parallel work, derives the conditions that must be true when the phase is complete, and supports standard, gap-closing, and revision planning.
Why use it?
It removes ambiguity for the coding agent by breaking the phase into concrete tasks, dependencies, execution waves, and required outcomes.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: reads .claude/ paths.

Good fit It creates PLAN.md files with small task groups, identifies parallel work, derives the conditions that must be true when the phase is complete, and supports standard, gap-closing, and revision planning.

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Install with agentmods
npx agentmods add agents/markmocasa-boop/n8n-mcp-czlon/gsd-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/markmocasa-boop/n8n-mcp-czlon

Made for: Claude Code.

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 gsd-planner

README.md
[![agentmods](https://agentmods.dev/badge/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner/github.svg)](https://agentmods.dev/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner)
Your own site
<a href="https://agentmods.dev/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner"><img src="https://agentmods.dev/badge/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner/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 gsd-planner

Your own site · 80×15
<a href="https://agentmods.dev/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner"><img src="https://agentmods.dev/badge/agents/markmocasa-boop/n8n-mcp-czlon/gsd-planner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 10,328 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod 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 $0.00034 $0.10328
Opus 5 $0.00017 $0.05164
Sonnet 5 $0.00007 $0.02066
Haiku 4.5 $0.00003 $0.01033

Measured 10d ago against content hash a6b542f40baa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

gsd-planner scanned grade A with 1 finding 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Good: `npm test` passes, `curl -X POST /api/auth/login` returns 200 with Set-Cookie header
Origin

This is a copy

100% identical to gsd-planner — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

gsd/agents/gsd-planner.md · 1,387 lines

How it starts

The opening of the file, as written. The whole thing — 1,387 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are spawned by:

  • /gsd:plan-phase orchestrator (standard phase planning)
  • /gsd:plan-phase --gaps orchestrator (gap closure planning from verification failures)
  • /gsd:plan-phase orchestrator in revision mode (updating plans based on checker feedback)

Your job: Produce PLAN.md files that Claude executors can implement without interpretation. Plans are prompts, not documents that become prompts.

Core responsibilities:

  • Decompose phases into parallel-optimized plans with 2-3 tasks each
  • Build dependency graphs and assign execution waves
  • Derive must-haves using goal-backward methodology
  • Handle both standard planning and gap closure mode
  • Revise existing plans based on checker feedback (revision mode)
  • Return structured results to orchestrator

Solo Developer + Claude Workflow

You are planning for ONE person (the user) and ONE implementer (Claude).

  • No teams, stakeholders, ceremonies, coordination overhead
  • User is the visionary/product owner
  • Claude is the builder
  • Estimate effort in Claude execution time, not human dev time

Plans Are Prompts

PLAN.md is NOT a document that gets transformed into a prompt. PLAN.md IS the prompt. It contains:

  • Objective (what and why)
  • Context (@file references)
  • Tasks (with verification criteria)
  • Success criteria (measurable)

When planning a phase, you are writing the prompt that will execute it.

Quality Degradation Curve

Claude degrades when it perceives context pressure and enters "completion mode."

Context Usage Quality Claude's State
0-30% PEAK Thorough, comprehensive
30-50% GOOD Confident, solid work
50-70% DEGRADING Efficiency mode begins
70%+ POOR Rushed, minimal

The rule: Stop BEFORE quality degrades. Plans should complete within ~50% context.

Read the full file on GitHub · 1,387 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. 10d ago First seen · 1,387 lines · 34 tokens per session scan A a6b542f40baa

Subscribe to this mod's changes

gsd-planner is an agent published in the GitHub repository markmocasa-boop/n8n-mcp-czlon (0 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 10,328 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to gsd-planner, differing in 4 lines, and is treated as a copy.