Module middleware 

Ordered middleware and capability registration.

Modules

artifacts

Agent-published session files and their frontend presentation.

attachments

User uploads exposed to the owning workspace.

compaction

Context compaction policy and provider routing.

context_offloading

Durable masking of stale tool output in active model context.

cron

Conversational recurring-task setup.

extensions

Standalone skills and activated Agent Plugin packages.

instructions

Bounded workspace instruction discovery.

manifest

Core-owned middleware configuration manifests.

scratchpad

Durable session and global notes for agent self-improvement.

session_files

Protected, session-bound storage shared by uploads and agent artifacts.

sessions

Chat catalog and durable forking middleware.

steering

Queued turn steering middleware.

subagents

Durable asynchronous child-agent middleware.

tasks

Optional durable todo planning.

tools

Tool registry, dispatch, and minimal filesystem tools.

Structs

ActiveCommandContext

Mutable turn state exposed to a capability command that can run immediately.

ActiveSubmissionContext

Mutable turn state exposed to the middleware owning an active operation.

CompactContext

State exposed immediately before or after context compaction.

FrontendExtensions

Read-only middleware UI surface consumed by a frontend shell.

MiddlewareCommandContext

State available to a middleware-owned frontend command.

MiddlewareCommandOutput

Result of a middleware-owned frontend command.

MiddlewareStack

A validated, declaration-ordered middleware pipeline.

ModelContext

Mutable state exposed immediately before a model request.

ModelRequestContext

Request-only model input exposed after every durable PreModel hook.

PermissionRequestContext

Mutable policy boundary for a sandbox approval request.

PostToolUseContext

Mutable model-visible result exposed after an executed tool call.

PreToolUseContext

Mutable policy boundary for one normalized model-requested tool call.

PromptSection

One middleware-owned section of the assembled system prompt.

QueuedInputQueue

Mutable scoped view of active input retained until the next model boundary.

QueuedInputSnapshot

Read-only startup snapshot containing only one middleware’s queued input.

QueuedInputValue

One queued input removed by its owning middleware.

QueuedInputView

Read-only queued input owned by the middleware receiving it.

RuntimeContext

Durable runtime identity exposed while middleware starts a session.

SessionStartContext

Mutable state shared by the declaration-ordered SessionStart hooks.

StopContext

Mutable policy boundary immediately before normal turn completion.

TurnEndContext

State exposed when the loop finishes or aborts a turn.

TurnIdentity

Stable facts shared by hooks that run within one active turn.

UserPromptSubmitContext

Mutable state exposed before a submitted user prompt enters durable context.

Enums

ActiveSubmissionResult

Result of a middleware-owned active operation.

SessionStartSource

Why Middleware::session_start is running.

Traits

Middleware

A capability contribution to the single ordered agent pipeline.

Type Aliases

FrontendEventSink

Sends middleware-owned UI updates without depending on a concrete frontend.