---
title: "eval-writer"
description: "Defines measurable success criteria and designs evaluations for any LLM-based task, product, feature, or piece of logic."
canonical: https://agentpluginsdirectory.com/plugins/eval-writer
last-updated: 2026-09-21
---

# eval-writer
Defines measurable success criteria and designs evaluations for any LLM-based task, product, feature, or piece of logic.
- Slug: eval-writer
- Publisher: Tien Nguyen
- Repository: https://github.com/tiennguyentt/agent-plugins
- Manifest: eval-writer/plugin.json
- Version: 1.3.0
- License: MIT
- Category (editorial): agent-tooling
- Skills: 1 (write-success-criteria)
- MCP servers: 0
- Stars: 0
- Repository created: 2026-07-31
- Repository last pushed: 2026-08-14
- Publisher type: User
- Listing: https://agentpluginsdirectory.com/plugins/eval-writer
- Schema: https://agent-plugins.org/schemas/1.0.0/plugin.schema.json

## What eval-writer does, in the publisher's words

One independent agent plugin in the agent-plugins marketplace:

This is one of several agent plugins in this repository, where agent teams do the work end to end. It is published on its own because a part that only runs inside the repo that grew it is not a part, it is a dependency.

Built for a team, not for a demo. One skill with one job, invocable without the agent. Its grading standard is a rubric.md file read by an agent that did not produce the work, which is exactly what makes a cheaper, independent verifier viable. The packaging is checked by machine: plugin.json conforms to Agent Plugins 1.0.0, and a contract check fails the build when the manifests, the entry skill, or the routes drift apart.

From the project README, punctuation lightly normalized. Full text: https://raw.githubusercontent.com/tiennguyentt/agent-plugins/HEAD/eval-writer/README.md

## Skills

- write-success-criteria: Defines measurable success criteria and designs an evaluation for any LLM-based task, product, feature, or piece of logic, not limited to capabilities. Use when the user asks "how do I know if this is working", "what does success look like for X", "help me design an eval for this feature", "cần ti…

Descriptions come from the frontmatter of each SKILL.md, punctuation lightly normalized.