architecture

Use when navigating the codebase for the first time, adding a new client method, adding a new container handler/service, or understanding how a request flows from Worker through the Sandbox DO into the container. Covers the three-layer architecture, client pattern, container runtime structure, and monorepo layout. (project)

1.33x

Quality

77%

Does it follow best practices?

Impact

100%

1.33x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./.agents/skills/architecture/SKILL.md

Evaluation results

100%

74%

Disk Usage Reporting — Implementation Plan

New control operation placement

Criteria

Without context

With context

Service layer for business logic

100%

Control-plane method added

100%

SDK-side mirror in container-control

100%

New capability not in clients/

100%

Handlers not used for new capability

100%

DI container wiring

100%

Unit tests on both sides

100%

E2E test for shell/filesystem behavior

100%

Correct step ordering

33%

100%

Production Deployment Guide — Preview URLs and Execution Isolation

Production preview URL setup

Criteria

Without context

With context

Custom domain requirement

100%

Wildcard DNS pattern

100%

.workers.dev limitation

100%

Sessions isolate cwd

100%

Sessions isolate env vars

100%

Default session auto-created

100%

Multiple sessions supported

100%

Platform-level isolation

100%

Port auto-cleanup

100%

Add R Language Support to Sandbox Container

Container image Dockerfile modification

Criteria

Without context

With context

Ubuntu 22.04 base preserved

100%

apt cache cleaned

100%

apt lists removed

100%

Cache cleanup in same layer

100%

R version pinned

100%

Bun server port preserved

100%

Existing runtimes preserved

100%

No additional unnecessary packages

100%

--no-install-recommends used

100%

Repository: cloudflare/sandbox-sdk
Commit: f03920a

Evaluated: 1 day ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Disk Usage Reporting — Implementation Plan Production Deployment Guide — Preview URLs and Execution Isolation Add R Language Support to Sandbox Container

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