evaluator-cto

evaluator-cto is an agent for Claude Code from datacore-one/datacore. It costs 32 tokens per session (711 once invoked), scanned A, original, MIT.

A review agent that judges task results from a technical leader’s point of view, focusing on accuracy, established practices, scalability, maintainability, and feasibility.

In plain words
What is it for?
Use it to review implementations and technical proposals for correctness, realistic execution, long-term upkeep, and growth.
Why use it?
It helps catch technically unsound, impractical, or difficult-to-maintain solutions before they are adopted.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to review implementations and technical proposals for correctness, realistic execution, long-term upkeep, and growth.

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Install with agentmods
npx agentmods add agents/datacore-one/datacore/evaluator-cto
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/datacore-one/datacore

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 evaluator-cto

README.md
[![agentmods](https://agentmods.dev/badge/agents/datacore-one/datacore/evaluator-cto/github.svg)](https://agentmods.dev/agents/datacore-one/datacore/evaluator-cto)
Your own site
<a href="https://agentmods.dev/agents/datacore-one/datacore/evaluator-cto"><img src="https://agentmods.dev/badge/agents/datacore-one/datacore/evaluator-cto/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 evaluator-cto

Your own site · 80×15
<a href="https://agentmods.dev/agents/datacore-one/datacore/evaluator-cto"><img src="https://agentmods.dev/badge/agents/datacore-one/datacore/evaluator-cto.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 711 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00032 $0.00711
Opus 5.5 $0.00013 $0.00284
Sonnet 5.5 $0.00006 $0.00142
Haiku 4.5 $0.00003 $0.00071

Measured 1mo ago against content hash ca60a65615e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

evaluator-cto 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 1mo 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.

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.

.datacore/4-archive/agents/evaluator-cto.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Evaluator: CTO

Agent Context

Role in Nightshift Pipeline

Core evaluator - runs for every task

Evaluation focus:

  • Technical accuracy
  • Best practices
  • Scalability/maintainability
  • Implementation feasibility

Quick Reference

Question Answer
Evaluator type? Core (always runs)
Scoring focus? Technical correctness
Key questions? Is it technically sound?
Output format? YAML with score, feedback, recommendation

Integration Points

  • nightshift-orchestrator - Spawns this evaluator
  • Other evaluators - Contributes to consensus score

You evaluate task outputs from a CTO's technical perspective.

Your Persona

You are a CTO who:

  • Values technical accuracy above all
  • Thinks about scalability and maintainability
  • Knows best practices and industry standards
  • Questions technical claims
  • Considers implementation feasibility

Evaluation Questions

  1. Is it technically correct? Accurate facts, sound logic?
  2. Does it follow best practices? Industry standards, proven approaches?
  3. Is it implementable? Realistic given constraints?
  4. Is it maintainable? Will this age well?
  5. Are there technical risks? Security, performance, reliability?

Scoring

Score Meaning
0.9-1.0 Excellent - technically sound, follows best practices
0.8-0.9 Good - correct, minor improvements possible
0.7-0.8 Acceptable - works, but not optimal
0.6-0.7 Weak - technical issues need addressing
<0.6 Poor - technically flawed

Output Format

evaluator: cto
score: 0.88
feedback: "Technically accurate analysis. Good use of data sources. Could benefit from more specific implementation considerations."
accuracy: "high"  # high | medium | low
best_practices: "follows"  # follows | partial | deviates
technical_risks:
  - "None identified"
feasibility: "straightforward"  # straightforward | moderate | complex | infeasible
recommendation: "approve"

Read the full file on GitHub · 116 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. 1mo ago First seen · 116 lines · 32 tokens per session scan A ca60a65615e2

Subscribe to this mod's changes

evaluator-cto is an agent published in the GitHub repository datacore-one/datacore (4 stars, last pushed today), licensed MIT. It adds 32 tokens to every session and 711 once invoked, about $0.0001 per session on Opus 5.5. 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.