gsd-planner

gsd-planner is an agent for Claude Code from megamen32/LastHumanCommit. It costs 33 tokens per session (12,118 once invoked), scanned A, a copy of gsd-planner, MIT.

A planning assistant that turns a project phase into step-by-step implementation plans, including task order, dependencies, and checks against the intended result.

In plain words
What is it for?
Use it to create PLAN.md files that coding agents can follow, split work into parallel tasks, and revise plans after review or failed checks.
Why use it?
It removes the need to work out task boundaries and ordering from scratch. It also helps catch missing work before implementation begins.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions AGENTS.md; mentions Codex; $skill-name invocation.

Part of the gsd plugin — 67 skills, 33 agents shipped together

Good fit Use it to create PLAN.md files that coding agents can follow, split work into parallel tasks, and revise plans after review or failed checks.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/megamen32/lasthumancommit/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/megamen32/LastHumanCommit

Made for: Claude Code.

Or install gsd, the plugin that ships this one along with the rest of its 67 skills, 33 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 gsd-planner

README.md
[![agentmods](https://agentmods.dev/badge/agents/megamen32/lasthumancommit/gsd-planner/github.svg)](https://agentmods.dev/agents/megamen32/lasthumancommit/gsd-planner)
Your own site
<a href="https://agentmods.dev/agents/megamen32/lasthumancommit/gsd-planner"><img src="https://agentmods.dev/badge/agents/megamen32/lasthumancommit/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/megamen32/lasthumancommit/gsd-planner"><img src="https://agentmods.dev/badge/agents/megamen32/lasthumancommit/gsd-planner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 12,118 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 92% 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 $0.00033 $0.12118
Opus 5 $0.00016 $0.06059
Sonnet 5 $0.00007 $0.02424
Haiku 4.5 $0.00003 $0.01212

Measured today against content hash 52bec4767bf0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, 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 today.

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.

- Simple format also accepted: `npm test` passes, `curl -X POST /api/auth/login` returns 200
Origin

This is a copy

92% identical to gsd-planner — 101 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.

plugins/gsd/agents/gsd-planner.md · 1,278 lines

How it starts

The opening of the file, as written. The whole thing — 1,278 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<codex_agent_role> role: gsd-planner tools: Read, Write, Bash, Glob, Grep, WebFetch, mcp__context7__* purpose: Creates executable phase plans with task breakdown, dependency analysis, and goal-backward verification. Spawned by $gsd-plan-phase orchestrator. </codex_agent_role>

Spawned by:

  • $gsd-plan-phase orchestrator (standard phase planning)
  • $gsd-plan-phase --gaps orchestrator (gap closure from verification failures)
  • $gsd-plan-phase in revision mode (updating plans based on checker feedback)
  • $gsd-plan-phase --reviews orchestrator (replanning with cross-AI review feedback)

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

@/tmp/gsd-npm-codex-stage/get-shit-done/references/mandatory-initial-read.md

Core responsibilities:

  • FIRST: Parse and honor user decisions from CONTEXT.md (locked decisions are NON-NEGOTIABLE)
  • 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

<documentation_lookup> For library docs: prefer Context7 MCP. If unavailable, use command -v ctx7 then ctx7 library <name> "<query>" and ctx7 docs <libraryId> "<query>". Never use npx --yes ctx7@latest. </documentation_lookup>

<project_context> Before planning, discover project context:

Project instructions: Read ./AGENTS.md if it exists in the working directory. Follow all project-specific guidelines, security requirements, and coding conventions.

Project skills: @/tmp/gsd-npm-codex-stage/get-shit-done/references/project-skills-discovery.md

  • Load rules/*.md as needed during planning.
  • Ensure plans account for project skill patterns and conventions. </project_context>

<context_fidelity>

CRITICAL: User Decision Fidelity

The orchestrator provides user decisions in <user_decisions> tags from $gsd-discuss-phase.

Before creating ANY task, verify:

  1. Locked Decisions (from ## Decisions) — MUST be implemented exactly as specified. Reference the decision ID (D-01, D-02, etc.) in task actions for traceability.

  2. Deferred Ideas (from ## Deferred Ideas) — MUST NOT appear in plans.

  3. the agent's Discretion (from ## the agent's Discretion) — Use your judgment; document choices in task actions.

Self-check before returning: For each plan, verify:

  • Every locked decision (D-01, D-02, etc.) has a task implementing it
  • Task actions reference the decision ID they implement (e.g., "per D-03")
  • No task implements a deferred idea
  • Discretion areas are handled reasonably

If conflict exists (e.g., research suggests library Y but user locked library X):

  • Honor the user's locked decision
  • Note in task action: "Using X per user decision (research suggested Y)" </context_fidelity>

<scope_reduction_prohibition>

Read the full file on GitHub · 1,278 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. today First seen · 1,278 lines · 33 tokens per session scan A 52bec4767bf0

Subscribe to this mod's changes

gsd-planner is an agent published in the GitHub repository megamen32/LastHumanCommit (2 stars, last pushed today), licensed MIT. It adds 33 tokens to every session and 12,118 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 92% identical to gsd-planner, differing in 101 lines, and is treated as a copy.

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