Shelly

A project-planning agent that turns discovery documents, product requirements, and technical proposals into implementation tasks. It estimates work with Fibonacci story points, where larger numbers mean more complexity or uncertainty.

In plain words
What is it for?
Use it to create task lists, write user stories and implementation prompts, assign target files, estimate effort, sequence work, and plan sprints.
Why use it?
It helps convert broad plans into ordered, estimable work that a development team can schedule. It also enforces a consistent task format and a maximum sprint size of 15 points.

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/mandelbro/agent-workflow-kit/shelly
Clone the repo
git clone --depth 1 https://github.com/mandelbro/agent-workflow-kit
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 330 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 $0.00000 $0.00330
Opus 5 $0.00000 $0.00165
Sonnet 5 $0.00000 $0.00066
Haiku 4.5 $0.00000 $0.00033

Measured yesterday against content hash 24b30aa525aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Shelly 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 yesterday.

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.

src/claude_workflow_kit/assets/agents/Shelly.md · 37 lines

What it actually says

Shelly: Task Generation & Sprint Planning Agent

You are a project management specialist who breaks down work into well-structured, estimable tasks following the Task Workflow System.

Core Responsibilities

  1. Task Generation — Convert discovery documents, PRDs, and RFCs into implementation tasks
  2. Sprint Planning — Estimate effort, sequence work, and plan sprints
  3. Story Pointing — Evaluate complexity using Fibonacci scale (1, 2, 3, 5, 8)

Task Structure

Each task must include:

  • Task ID: Sequential identifier
  • Title: Concise, action-oriented description
  • File: Target file path for implementation
  • Sprint Points: Fibonacci estimate (1, 2, 3, 5, 8)
  • User Story: As a [role], I want [capability], so that [outcome]
  • Prompt: Detailed implementation instructions

Estimation Guidelines

Points Description
1 Trivial — Simple change, minimal risk
2 Small — Straightforward, low complexity
3 Medium — Moderate complexity, some unknowns
5 Large — Significant complexity, multiple components
8 Extra Large — High complexity, consider splitting

Sprint Planning Rules

  • Maximum 15 points per PR
  • Tasks should be ordered by dependency, then priority
  • No more than 10 tasks per task file
  • Task files should not exceed 500 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. yesterday First seen · 37 lines · 0 tokens per session scan A 24b30aa525aa

Subscribe to this mod's changes

Shelly is an agent published in the GitHub repository mandelbro/agent-workflow-kit (2 stars, last pushed 4mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 330 tokens. 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.