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codex-mcp

Use this `codex-mcp` skill to instruct another AI Agent to invoke a tool or execute a workflow on your behalf for the following scenario, 1.When you are requested to invoke a mcp tool that you don't have access (can use `ListMcpResourcesTool` to check) such as `context7`, `github`, `linear`, `jira`; 2.When you are requested to execute a complex workflow that require interacting with multiple mcp tools and bash CLI commands for example `github-project-create-items`, `github-project-list-items` workflows;

personAuthor: jakexiaohubgithub
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codex-mcp

You MUST check whether codex CLI and MCP server are available in the current bash environment with this bash command: codex mcp list. If not available, run the following bash command to install the codex CLI: npm install -g @openai/codex. Then inform user to perform authentication with an OpenAI account by running codex login. Ignore this instruction if the CLI is already available.

Tools

mcp__codex__codex

Run a Codex session. Accepts configuration parameters matching the Codex Config struct. Supported properties:

| Property | Type | Description | | ----------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------ | | prompt (required) | string | Initial user prompt that seeds the Codex conversation. | | approval-policy | string | Approval policy for generated shell commands: untrusted, on-failure, on-request, never. | | base-instructions | string | Overrides the default base instructions for the session. | | compact-prompt | string | Prompt used when compacting the conversation. | | config | object | Path to individual config settings toml file that override $CODEX_HOME/config.toml (see codex-config-toml-structure.md to understand how to create this file). | | cwd | string | Working directory for the session. Relative paths resolve from the server process root. | | developer-instructions| string | Developer instructions that should be injected as a developer role message. | | model | string | Optional override for the model name (e.g., gpt-5.1-codex-mini, gpt-5.1-codex) default is gpt-5-codex. | | profile | string | Name of the profile providing default options (defined in config.toml). | | sandbox | string | Sandbox mode: read-only, workspace-write, or danger-full-access. |

mcp__codex__codex-reply

Continue a Codex session by providing the conversation id and follow-up prompt. Supported properties:

| Property | Type | Description | | ------------------------------- | ------ | -------------------------------------------------------- | | prompt (required) | string | Next user prompt to continue the Codex conversation. | | conversationId (required) | string | Identifier of the conversation to continue. |

Operational Requirements

  • Always route qualifying requests through mcp__codex__codex with sandbox set to danger-full-access (MUST) , approval-policy set to never (MUST) and model set to gpt-5.1-codex-mini (SHOULD).
  • When an unknown MCP tool name is requested, use ListMcpResourcesTool to confirm if it is available. If not available, delegate to codex to invoke this MCP tool by crafting a prompt with all necessary information and file referrences.
  • When you need to run a command that would emit large stdout output but only a subset of that output is needed, MUST provide a precise prompt when delegating via mcp__codex__codex so the downstream agent knows which portion of the large output to collect or which external tool to execute.
  • When mcp__codex__codex returns a result requiring your follow-up, continue the conversation with mcp__codex__codex-reply, reusing the conversationId present in the previous response.

Known MCP Server Tools

  • When github MCP server tool (mcp__github, mcp__github__*) is requested, see mcp-github-usage.md for detailed usage instructions. Use the information in this file to craft a precise prompt when delegating via mcp__codex__codex so the downstream agent can use the github MCP server tool exactly as intended.
  • When linear MCP server tool (mcp__linear, mcp__linear__*) is requested, see mcp-linear-usage.md for detailed usage instructions. Use the guidance in this file to compose precise prompts when delegating via mcp__codex__codex so the downstream agent invokes Linear tools correctly.
  • When context7 MCP server tool is requested, see mcp-context7-usage.md for detailed usage instructions.