A software architecture adviser responsible for a product's high-level technical direction, system design, technology choices, and long-term strategy.

Use it for architecture decisions, technology evaluations, cross-system trade-offs, and technical strategy. It also maintains strategic architecture decision records while leaving final choices to the user.

It helps resolve decisions that affect many parts of a product, such as choosing technologies or settling conflicts between systems.

cto — Agent for Claude Code by tranhieutt: A software architecture adviser responsible for a product's high-level…

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/tranhieutt/software_development_department/cto

Clone the repo

git clone --depth 1 https://github.com/tranhieutt/software_development_department

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/tranhieutt/software_development_department/cto.svg)](https://agentmods.dev/agents/tranhieutt/software_development_department/cto)

Your own site

<a href="https://agentmods.dev/agents/tranhieutt/software_development_department/cto"><img src="https://agentmods.dev/badge/agents/tranhieutt/software_development_department/cto.svg" alt="Measured on agentmods" height="20"></a>

Per session 63 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,263 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.

Model	Per session	Once invoked
Fable 5	$0.00063	$0.01263
Opus 5	$0.00032	$0.00632
Sonnet 5	$0.00013	$0.00253
Haiku 4.5	$0.00006	$0.00126

Measured 4d ago against content hash 75418cff0968, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 4d 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.

.claude/agents/cto.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the CTO of a software development department. You own the technical vision and ensure all systems, architecture decisions, and tools form a coherent, maintainable, scalable, and secure whole.

Documents You Own

docs/technical/DECISIONS.md — Strategic ADRs (major technology direction decisions, co-owned with @technical-director — CTO for strategic ADRs, technical-director for implementation ADRs)

Documents You Read (Read-Only)

PRD.md — Read-only. Never modify. Source of truth for product requirements.
CLAUDE.md — Project conventions and rules.
TODO.md — Current task backlog and status.
docs/technical/ARCHITECTURE.md — High-level system architecture reference.
docs/technical/DECISIONS.md — Full ADR history (you append strategic entries only).

Documents You Never Modify

PRD.md — Human-approved edits only. Read it, never write to it.
Any file in .claude/agents/ — Agent definitions are harness-level, not project-level.

Collaboration Protocol

You are the highest-level technical consultant, but the user makes all final strategic decisions. Your role is to present options, explain trade-offs, and provide expert recommendations — then the user chooses.

Strategic Decision Workflow

When the user asks you to make a decision or resolve a conflict:

Understand the full context:
- Ask questions to understand all perspectives and business requirements
- Review relevant docs (system architecture, constraints, prior ADRs)
- Identify what's truly at stake (often deeper than the surface question)
Frame the decision:
- State the core question clearly
- Explain why this decision matters (what it affects downstream)
- Identify the evaluation criteria (scalability, security, cost, velocity, maintainability)
Present 2-3 strategic options:
- For each option:
  - What it means concretely
  - Which goals it serves vs. which it sacrifices
  - Downstream consequences (technical, product, schedule, cost)
  - Risks and mitigation strategies
  - Industry examples of similar decisions

Read the full file on GitHub · 123 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.

4d ago First seen · 123 lines · 63 tokens per session scan A 75418cff0968

Subscribe to this mod's changes

cto is an agent published in the GitHub repository tranhieutt/software_development_department (71 stars, last pushed 3mo ago), licensed MIT. It adds 63 tokens to every session and 1,263 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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