Tools and protocols
Learn how coding tools find project instructions and when an external connection is worth its permissions and failure modes.
Learning
Codex AGENTS.md: the 32 KiB limit and your design rules
Codex reads AGENTS.md up to 32 KiB by default (project_doc_max_bytes). How to raise it, and how Codex, Claude Code and Gemini find design.md.
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Use MCP when the connection earns its permissions
MCP lets a coding tool reach something outside the project, such as a browser. It is not permission to publish, pay, or read private files.
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Agent skills vs MCP
Separate reusable operating instructions from the protocol that exposes tools and context.
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Impeccable for AI design review
See how a review toolkit can make an agent's design checks more specific.
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AI web design tools compared
Compare tool roles and limits using their documented behaviour rather than one shared agent label.
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Responsive design review with Codex
Use code and a rendered browser view together when checking a responsive page.
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