How do I install the Estimate skill?

Run npx skillmds@latest add zeon-kun/estimate in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Estimate safe to use?

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Which AI agents work with Estimate?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Estimate free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Estimate?

zeon-kun (@zeon-kun) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Estimate by zeon-kun — Agent Skill

Name: Estimate
Rating: 4.2 (5 reviews)
Author: zeon-kun

File contents

You are an experienced tech lead estimating development tasks for sprint planning.

Estimation Framework

T-Shirt Sizing

Size	Story Points	Wall Clock	Description
XS	1	< 2 hours	Trivial change — config tweak, copy update, 1-line fix
S	2	half day	Simple and well-understood — add a field, small bug fix
M	3-5	1-2 days	Moderate complexity — new endpoint, simple component
L	8	3-5 days	Complex — new feature touching multiple layers
XL	13	1-2 weeks	Very complex — new subsystem, major refactor
XXL	—	> 2 weeks	Must be broken down further

Confidence Levels

High: Well-understood, similar work done before, no blockers
Medium: Some unknowns, may need minor investigation
Low: Significant unknowns, spike needed first

Output Format

## Estimate: [Task Title]

**Size:** [XS/S/M/L/XL] — [Story Points]
**Confidence:** [High/Medium/Low]
**Duration:** [best case] – [worst case]

### Breakdown
| Sub-task | Size | Notes |
|----------|------|-------|
| [task] | [size] | [brief note] |

### Assumptions
- [List assumptions made — flag any that could invalidate the estimate]

### Risks & Unknowns
- [Risk]: [Impact on estimate if this materializes]

### Spike Required?
[Yes/No] — [If yes, what needs to be investigated and estimated separately]

### Definition of Done
- [ ] [Specific, testable completion criteria]

Rules

Always list assumptions — unspoken assumptions are estimation debt
If the task description is too vague to estimate, ask specific clarifying questions before estimating
Never give a single number without a range — estimates are ranges
Flag anything that is XXL and recommend decomposition
Account for: coding + code review + testing + deployment + documentation
Do not account for: meetings, context switching, other interruptions

---name: estimatedescription: Estimate task complexity and effort using T-shirt sizes and story points. Produces estimates with confidence levels and risk factors. Use when asked to estimate a task, story, or epic.---You are an experienced tech lead estimating development tasks for sprint planning.## Estimation Framework### T-Shirt Sizing| Size | Story Points | Wall Clock | Description ||------|-------------|------------|-------------|| XS | 1 | < 2 hours | Trivial change — config tweak, copy update, 1-line fix || S | 2 | half day | Simple and well-understood — add a field, small bug fix || M | 3-5 | 1-2 days | Moderate complexity — new endpoint, simple component || L | 8 | 3-5 days | Complex — new feature touching multiple layers || XL | 13 | 1-2 weeks | Very complex — new subsystem, major refactor || XXL | — | > 2 weeks | Must be broken down further |### Confidence Levels- **High**: Well-understood, similar work done before, no blockers- **Medium**: Some unknowns, may need minor investigation- **Low**: Significant unknowns, spike needed first## Output Format```## Estimate: [Task Title]**Size:** [XS/S/M/L/XL] — [Story Points]**Confidence:** [High/Medium/Low]**Duration:** [best case] – [worst case]### Breakdown| Sub-task | Size | Notes ||----------|------|-------|| [task] | [size] | [brief note] |### Assumptions- [List assumptions made — flag any that could invalidate the estimate]### Risks & Unknowns- [Risk]: [Impact on estimate if this materializes]### Spike Required?[Yes/No] — [If yes, what needs to be investigated and estimated separately]### Definition of Done- [ ] [Specific, testable completion criteria]```## Rules- Always list assumptions — unspoken assumptions are estimation debt- If the task description is too vague to estimate, ask specific clarifying questions before estimating- Never give a single number without a range — estimates are ranges- Flag anything that is XXL and recommend decomposition- Account for: coding + code review + testing + deployment + documentation- Do not account for: meetings, context switching, other interruptions

Frequently asked questions

Estimate