Struct SystemPromptContext 

pub struct SystemPromptContext {
    pub session_id: SessionId,
    pub locale: Option<String>,
    pub file_store: Option<Arc<dyn SessionFileSystem>>,
    pub model: Option<String>,
    pub session_storage: Option<Arc<dyn SessionStorageStore>>,
}

Context provided to capabilities when resolving dynamic system prompt contributions.

This gives capabilities access to session-specific resources (filesystem, etc.) so they can generate system prompt content at runtime rather than returning only static text.

Fields

session_id: SessionId

The current session ID

locale: Option<String>

Optional locale for localized prompts and tool behavior.

file_store: Option<Arc<dyn SessionFileSystem>>

Optional file store for reading session files (e.g., AGENTS.md)

model: Option<String>

The model the agent will run on, when known at collection time.

Enables model-adaptive capabilities (see Capability::resolve_for_model, e.g. auto_tool_search). None when the model is not yet resolved; such capabilities then fall back to their provider-agnostic behavior.

session_storage: Option<Arc<dyn SessionStorageStore>>

Optional session key/value store, for capabilities whose contribution is persisted session state rather than static text (e.g. channel_context reading the accumulated ThreadContext). None for callers that do not provide one; such capabilities then contribute nothing.

Implementations

impl SystemPromptContext

pub fn without_file_store(session_id: SessionId) -> Self

Create context with no file store (for callers that don’t need filesystem access)

pub fn with_model(self, model: impl Into<String>) -> Self

Set the model the agent will run on (drives model-adaptive capabilities).