codex-rs/core/src/context/apps_instructions.rs

use codex_mcp::CODEX_APPS_MCP_SERVER_NAME;
use codex_protocol::protocol::APPS_INSTRUCTIONS_CLOSE_TAG;
use codex_protocol::protocol::APPS_INSTRUCTIONS_OPEN_TAG;

use super::ContextualUserFragment;
use codex_protocol::models::ContentItemKind;

#[derive(Debug, Clone, PartialEq)]
pub(crate) struct AppsInstructions;

impl ContextualUserFragment for AppsInstructions {
    fn content_kind(&self) -> ContentItemKind {
        ContentItemKind("apps.instructions".to_string())
    }

    fn role(&self) -> &'static str {
        "developer"
    }

    fn markers(&self) -> (&'static str, &'static str) {
        Self::type_markers()
    }

    fn type_markers() -> (&'static str, &'static str) {
        (APPS_INSTRUCTIONS_OPEN_TAG, APPS_INSTRUCTIONS_CLOSE_TAG)
    }

    fn body(&self) -> String {
        format!(
            "\n## Apps (Connectors)\nApps (Connectors) can be explicitly triggered in user messages in the format `[$app-name](app://{{connector_id}})`. Apps can also be implicitly triggered as long as the context suggests usage of available apps.\nAn app is equivalent to a set of MCP tools within the `{CODEX_APPS_MCP_SERVER_NAME}` MCP.\nAn installed app's MCP tools are either provided to you already, or can be lazy-loaded through the `tool_search` tool. If `tool_search` is available, the apps that are searchable by `tools_search` will be listed by it.\nDo not additionally call list_mcp_resources or list_mcp_resource_templates for apps.\n"
        )
    }
}