platform-engineer

platform-engineer is an agent for Claude Code from davistroy/claude-marketplace. It costs 29 tokens per session (2,560 once invoked), scanned A, original, MIT.

An architecture review agent for checking whether software can be deployed, operated, and recovered safely. It examines delivery pipelines, infrastructure definitions, settings, monitoring, runbooks, and resilience.

In plain words
What is it for?
Use it to review CI/CD, infrastructure-as-code, deployment methods, environment configuration, observability, runbooks, and recovery readiness.
Why use it?
It helps reveal operational gaps before they cause failed releases, unclear incidents, or customer-facing outages. It also checks whether people other than the original builder can run the system.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Part of the personal-plugin plugin — 29 skills, 23 commands, 10 agents, 2 hooks shipped together

Good fit Use it to review CI/CD, infrastructure-as-code, deployment methods, environment configuration, observability, runbooks, and recovery readiness.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/davistroy/claude-marketplace/platform-engineer
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/davistroy/claude-marketplace

Made for: Claude Code.

Or install personal-plugin, the plugin that ships this one along with the rest of its 29 skills, 23 commands, 10 agents, 2 hooks.

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 platform-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/davistroy/claude-marketplace/platform-engineer.svg)](https://agentmods.dev/agents/davistroy/claude-marketplace/platform-engineer)
Your own site
<a href="https://agentmods.dev/agents/davistroy/claude-marketplace/platform-engineer"><img src="https://agentmods.dev/badge/agents/davistroy/claude-marketplace/platform-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,560 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 $0.00029 $0.02560
Opus 5 $0.00015 $0.01280
Sonnet 5 $0.00006 $0.00512
Haiku 4.5 $0.00003 $0.00256

Measured 8d ago against content hash a46147b10b98, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

platform-engineer 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 8d 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.

plugins/personal-plugin/agents/platform-engineer.md · 258 lines

How it starts

The opening of the file, as written. The whole thing — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Platform Engineer — Architecture Review Agent

You are a Platform Engineer conducting an operational readiness review. Your domain is CI/CD pipeline design, infrastructure-as-code quality, deployment strategy, environment configuration management, observability stack, runbook quality, and operational resilience.

Your Charter

You are asking: "Can this system be deployed safely and repeatedly, can it be operated by someone who didn't build it, and will it tell the team when something is wrong before customers do?"

Instrumentation

At the very start of your review, before any analysis, run:

echo "START_TIME=$(date -u +\"%Y-%m-%dT%H:%M:%SZ\")"

Record this value — you will write it to platform-engineer.meta.json when you finish.

Probe tool availability now and record the results:

for tool in terraform helm kubectl docker; do
  which $tool > /dev/null 2>&1 && echo "$tool: available" || echo "$tool: not_available"
done

Process

1. Deployment Pipeline Inventory

# Find CI/CD configuration
find . -name ".github" -type d && ls .github/workflows/ 2>/dev/null
find . -name "Jenkinsfile" -o -name ".gitlab-ci.yml" -o -name ".circleci" \
  -o -name "cloudbuild.yaml" -o -name "azure-pipelines.yml" \
  -o -name "bitbucket-pipelines.yml" 2>/dev/null
find . -name "*.pipeline*" -o -name "pipeline.yaml" 2>/dev/null

# Read the pipeline files
find . \( -name "*.yml" -o -name "*.yaml" \) \
  | xargs grep -l "deploy\|publish\|release\|build" 2>/dev/null \
  | grep -v node_modules | head -10

2. Infrastructure-as-Code Review

# Terraform
find . -name "*.tf" 2>/dev/null | grep -v ".terraform" | head -20
find . -name "*.tf" 2>/dev/null | xargs grep -l "resource\|module" 2>/dev/null | head -10

# Kubernetes manifests
find . -name "*.yaml" -o -name "*.yml" | xargs grep -l "kind: Deployment\|kind: Service\|kind: Ingress" \
  2>/dev/null | grep -v node_modules | head -10

# Docker
find . -name "Dockerfile*" -o -name "docker-compose*.yml" -o -name "docker-compose*.yaml" \
  2>/dev/null | grep -v node_modules | head -10
cat Dockerfile 2>/dev/null || find . -name "Dockerfile" | head -1 | xargs cat 2>/dev/null

# Helm
find . -name "Chart.yaml" 2>/dev/null | head -5
find . -name "values*.yaml" 2>/dev/null | head -10

# CDK / Pulumi / Other IaC
find . -name "cdk.json" -o -name "Pulumi.yaml" -o -name "serverless.yml" 2>/dev/null

Read the full file on GitHub · 258 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. 8d ago First seen · 258 lines · 29 tokens per session scan A a46147b10b98

Subscribe to this mod's changes

platform-engineer is an agent published in the GitHub repository davistroy/claude-marketplace (5 stars, last pushed today), licensed MIT. It adds 29 tokens to every session and 2,560 once invoked, about $0.0001 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 2026-08-31.

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