Structured error for CLI failure envelopes.

Raised when a parsed patch cannot be applied.

Raised when a patch hunk is malformed.

Raised when the patch envelope is malformed.

HTTP MCP session that handles MCP streamable HTTP with session management.

Middleware that connects llm_aggregators events to streaming callbacks. This middleware bridges the gap between: 1. llm_aggregators layer: wh

Single harbor evaluation timeout.

Wrapper for MCP tools to conform to NexAU Tool interface.

Optional circuit breaker to avoid hammering a failing primary. RFC-0003: 熔断器配置 当主 provider 连续失败 failure_threshold 次后，在 recovery_timeout_seco

Parses and validates the flat YAML configuration.

Utility class for formatting DataFrames with type information for LLM consumption.

Represents a single edit operation.

Total experiment duration timeout.

Conditions that trigger failover to the next provider. RFC-0003: 降级触发条件配置

A fallback LLM provider configuration. RFC-0003: 备用 provider 配置

Handler for different file formats with appropriate parsing methods.

HTML parser for web content extraction.

Client for connecting to and managing MCP servers.

High-level manager for MCP operations.

Configuration for an MCP server.

Serper API search implementation.

Sliding window compaction strategy - keeps recent conversation iterations. An "iteration" is bounded by ASSISTANT messages: [USER or FRAMEWOR

Trigger compaction when token usage exceeds a percentage threshold. This is similar to Claude Code's auto-compact behavior.

Tool result compaction strategy - compacts old tool execution results. An "iteration" is bounded by ASSISTANT messages: [USER or FRAMEWORK](o

Emergency compaction strategy for overflow fallback. Strategy rules: 1. Preserve minimal safety region: - system message - rece

Simple circuit breaker for the primary provider. RFC-0003: 熔断器实现 状态机: CLOSED → OPEN → HALF_OPEN → CLOSED - CLOSED: 正常调用主 provider -

Base error for apply_patch failures.

Protocol for compaction strategies that determine how to compact messages.

Middleware for automatic context compaction with customizable strategies. This middleware monitors token usage and automatically compacts the mes

Inject a one-shot environment summary before the first model call. Args: timeout_per_command_ms: Per-probe command timeout in millisecond

Adds sequence-level shell execution hints for recurring failure patterns.

LLM provider failover middleware. RFC-0003: LLM 自动降级中间件 当主 provider 调用失败且匹配触发条件时，自动按顺序尝试备用 provider。 通过 wrap_model_call 拦截，不修改 LLMCaller

Truncates oversized tool outputs and persists the full version to disk. The middleware operates in the ``after_tool`` phase. If the serialized

Intercept ``complete_task`` and require passing verification first. Args: max_blocks: Maximum consecutive interceptions before force-allo

Injects iteration and optional token budget hints before model calls.

Protocol for trigger strategies that determine when to compact.

Stored parameters needed to recreate an HTTP MCP session.