Struct BackgroundProgressConfig 

pub struct BackgroundProgressConfig {
    pub default_recent_blocks: usize,
    pub block_text_limit: usize,
    pub finished_tasks_cap: usize,
}

Configuration for the background task progress view.

The goal is to give the main agent a bird’s-eye view of what a subagent is currently doing, not to flood the main agent’s context with the full text of sub-turns. Therefore the defaults are conservative — assistant/thinking text is omitted by default (block_text_limit = 0, reporting only metadata like “there is an assistant text / thinking”); tool calls, which are naturally short, are kept as-is. Users can increase block_text_limit when more detail is needed.

The source of truth for configuration lives on the agent side (here). defect-config’s ToolsConfig.background reuses this struct directly (same cross-crate reuse pattern as TurnConfig / SessionCapabilitiesConfig — config depends on agent, not the other way around).

Fields

default_recent_blocks: usize

How many recent message blocks inspect_background_task returns by default when called without the recent_blocks argument. 0 is treated as 1 (at least one block is always returned, otherwise peek would always be empty).

block_text_limit: usize

Maximum number of Unicode scalar values for the body of a single block, applied to free-form text such as assistant messages, thinking blocks, and tool results. Text exceeding this limit is truncated at the boundary with an ellipsis marker. 0 means no body text is kept (only the block’s type and metadata, e.g. tool name) — this is the default, and minimizes pollution of the main agent’s context.

finished_tasks_cap: usize

How many finished task entries to keep in the tasks table. Running entries don’t count toward the cap — they must remain to be cancelable/peekable. When the cap is exceeded, the oldest finished entry is evicted. Bounds the memory footprint of long-lived sessions that spawn many background tasks.

Trait Implementations

impl Clone for BackgroundProgressConfig

fn clone(&self) -> BackgroundProgressConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BackgroundProgressConfig

impl Debug for BackgroundProgressConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for BackgroundProgressConfig

fn default() -> Self

Returns the “default value” for a type.

impl Eq for BackgroundProgressConfig

impl PartialEq for BackgroundProgressConfig

fn eq(&self, other: &BackgroundProgressConfig) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for BackgroundProgressConfig