This PR adds support for [MCP resources](https://modelcontextprotocol.io/specification/2025-06-18/server/resources) by adding three new tools for the model: 1. `list_resources` 2. `list_resource_templates` 3. `read_resource` These 3 tools correspond to the [three primary MCP resource protocol messages](https://modelcontextprotocol.io/specification/2025-06-18/server/resources#protocol-messages). Example of listing and reading a GitHub resource tempalte <img width="2984" height="804" alt="CleanShot 2025-10-15 at 17 31 10" src="https://github.com/user-attachments/assets/89b7f215-2e2a-41c5-90dd-b932ac84a585" /> `/mcp` with Figma configured <img width="2984" height="442" alt="CleanShot 2025-10-15 at 18 29 35" src="https://github.com/user-attachments/assets/a7578080-2ed2-4c59-b9b4-d8461f90d8ee" /> Fixes #4956
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this
macOS
Expects /usr/bin/sandbox-exec to be present.
Linux
Expects the binary containing codex-core to run the equivalent of codex sandbox linux (legacy alias: codex debug landlock) when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
All Platforms
Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.