Module engine 

Re-exports

pub use react_loop_guard::NoopGuard;

pub use react_loop_guard::ReactLoopGuard;

pub use crate::types::AgentResult;

pub use auto_continue::AutoContinueMiddleware;

pub use max_turns_nudge::MaxTurnsNudgeConfig;

pub use max_turns_nudge::MaxTurnsNudgeMiddleware;

pub use repeat_tool_limit::RepeatToolLimitConfig;

pub use repeat_tool_limit::RepeatToolLimitMiddleware;

Modules

auto_continue

max_turns_nudge

react_loop_guard

repeat_tool_limit

Structs

AgentBuilder

AgentRuntime

AgentSession

Stable identity + rolling state of a single chat thread.

AllowAllApprovalHandler

ApprovalRequest

CompactionOutcome

Successful compaction outcome: what happened plus the messages to install.

ConsecutiveFailureRecovery

Recovery strategy that tracks consecutive failures per tool and stops after a limit.

ContextWindowManager

DefaultPipeline

Default pipeline: ToolPolicy hooks + timeout + output size limit.

DenyAllApprovalHandler

GuardCtx

Guard context information — built by runtime, passed to guard.

InMemorySessionStore

NoticeHandle

Cloneable publish handle for engine-internal notices.

PostLlmCtx

PreLlmCtx

RetryOnError

Continue on tool failure, feeding the error back to the model

SessionId

Unique identifier for an agent session.

SessionManager

StopOnError

Default strategy: stop on tool failure.

ToolEnforcementConfig

ToolEnforcementMiddleware

TurnFactMiddleware

Turn fact summary middleware — injects structured facts from the previous turn’s tool results into the next user message.

TurnToolLimitMiddleware

Middleware that enforces a hard limit on tool calls per turn.

UserMessageCtx

Enums

ApprovalDecision

CompactionKind

What a successful ContextCompaction::compact actually did to the history. agent-base stays strategy-free: it only relays the kind into the log line, so a nudge append never reads as a compaction and a real replacement always does (issue #33).

GuardDecision

Guard decision — returned by guard, executed by base loop.

QueueMode

Controls how queued messages are drained each turn.

RiskLevel

ToolErrorAction

Action taken by the runtime after a tool execution failure

Traits

ApprovalHandler

Trait for handling tool approval requests.

ContextCompaction

Trait for inline context compaction within the react loop.

Middleware

SessionStore

Session Persistence Adapter

ToolErrorRecovery

Recovery strategy after a tool execution failure

ToolExecutionPipeline

Pure execution pipeline — cares about how to safely execute a tool.

Functions

estimate_messages_tokens

Estimate total tokens across a message list using ContextWindowManager::message_tokens.

first_system_prompt

Find the first non-ephemeral System message (the system prompt).