WIP: Refactor agent package - not compiling

- Renamed AppMessage to AgentMessage throughout
- New agent-loop.ts with AgentLoopContext, AgentLoopConfig
- Removed transport abstraction, Agent now takes streamFn directly
- Extracted streamProxy to proxy.ts utility
- Removed agent-loop from pi-ai (now in agent package)
- Updated consumers (coding-agent, mom) for AgentMessage rename
- Tests updated but some consumers still need migration

Known issues:
- AgentTool, AgentToolResult not exported from pi-ai
- Attachment not exported from pi-agent-core
- ProviderTransport removed but still referenced
- messageTransformer -> convertToLlm migration incomplete
- CustomMessages declaration merging not working properly

packages/coding-agent/src/core/agent-session.ts

@@ -13,7 +13,14 @@
  * Modes use this class and add their own I/O layer on top.
  */
 
-import type { Agent, AgentEvent, AgentState, AppMessage, Attachment, ThinkingLevel } from "@mariozechner/pi-agent-core";
+import type {
+	Agent,
+	AgentEvent,
+	AgentMessage,
+	AgentState,
+	Attachment,
+	ThinkingLevel,
+} from "@mariozechner/pi-agent-core";
 import type { AssistantMessage, Message, Model, TextContent } from "@mariozechner/pi-ai";
 import { isContextOverflow, modelsAreEqual, supportsXhigh } from "@mariozechner/pi-ai";
 import { getAuthPath } from "../config.js";
@@ -403,7 +410,7 @@ export class AgentSession {
 	}
 
 	/** All messages including custom types like BashExecutionMessage */
-	get messages(): AppMessage[] {
+	get messages(): AgentMessage[] {
 		return this.agent.state.messages;
 	}
 

packages/coding-agent/src/core/compaction.ts

@@ -5,17 +5,17 @@
  * and after compaction the session is reloaded.
  */
 
-import type { AppMessage } from "@mariozechner/pi-agent-core";
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
 import type { AssistantMessage, Model, Usage } from "@mariozechner/pi-ai";
 import { complete } from "@mariozechner/pi-ai";
 import { messageTransformer } from "./messages.js";
 import { type CompactionEntry, createSummaryMessage, type SessionEntry } from "./session-manager.js";
 
 /**
- * Extract AppMessage from an entry if it produces one.
+ * Extract AgentMessage from an entry if it produces one.
  * Returns null for entries that don't contribute to LLM context.
  */
-function getMessageFromEntry(entry: SessionEntry): AppMessage | null {
+function getMessageFromEntry(entry: SessionEntry): AgentMessage | null {
 	if (entry.type === "message") {
 		return entry.message;
 	}
@@ -73,7 +73,7 @@ export function calculateContextTokens(usage: Usage): number {
  * Get usage from an assistant message if available.
  * Skips aborted and error messages as they don't have valid usage data.
  */
-function getAssistantUsage(msg: AppMessage): Usage | null {
+function getAssistantUsage(msg: AgentMessage): Usage | null {
 	if (msg.role === "assistant" && "usage" in msg) {
 		const assistantMsg = msg as AssistantMessage;
 		if (assistantMsg.stopReason !== "aborted" && assistantMsg.stopReason !== "error" && assistantMsg.usage) {
@@ -113,7 +113,7 @@ export function shouldCompact(contextTokens: number, contextWindow: number, sett
  * Estimate token count for a message using chars/4 heuristic.
  * This is conservative (overestimates tokens).
  */
-export function estimateTokens(message: AppMessage): number {
+export function estimateTokens(message: AgentMessage): number {
 	let chars = 0;
 
 	// Handle bashExecution messages
@@ -323,7 +323,7 @@ Be concise, structured, and focused on helping the next LLM seamlessly continue
  * Generate a summary of the conversation using the LLM.
  */
 export async function generateSummary(
-	currentMessages: AppMessage[],
+	currentMessages: AgentMessage[],
 	model: Model<any>,
 	reserveTokens: number,
 	apiKey: string,
@@ -371,9 +371,9 @@ export interface CompactionPreparation {
 	/** UUID of first entry to keep */
 	firstKeptEntryId: string;
 	/** Messages that will be summarized and discarded */
-	messagesToSummarize: AppMessage[];
+	messagesToSummarize: AgentMessage[];
 	/** Messages that will be kept after the summary (recent turns) */
-	messagesToKeep: AppMessage[];
+	messagesToKeep: AgentMessage[];
 	tokensBefore: number;
 	boundaryStart: number;
 }
@@ -408,14 +408,14 @@ export function prepareCompaction(entries: SessionEntry[], settings: CompactionS
 	const historyEnd = cutPoint.isSplitTurn ? cutPoint.turnStartIndex : cutPoint.firstKeptEntryIndex;
 
 	// Messages to summarize (will be discarded after summary)
-	const messagesToSummarize: AppMessage[] = [];
+	const messagesToSummarize: AgentMessage[] = [];
 	for (let i = boundaryStart; i < historyEnd; i++) {
 		const msg = getMessageFromEntry(entries[i]);
 		if (msg) messagesToSummarize.push(msg);
 	}
 
 	// Messages to keep (recent turns, kept after summary)
-	const messagesToKeep: AppMessage[] = [];
+	const messagesToKeep: AgentMessage[] = [];
 	for (let i = cutPoint.firstKeptEntryIndex; i < boundaryEnd; i++) {
 		const msg = getMessageFromEntry(entries[i]);
 		if (msg) messagesToKeep.push(msg);
@@ -482,7 +482,7 @@ export async function compact(
 
 	// Extract messages for history summary (before the turn that contains the cut point)
 	const historyEnd = cutResult.isSplitTurn ? cutResult.turnStartIndex : cutResult.firstKeptEntryIndex;
-	const historyMessages: AppMessage[] = [];
+	const historyMessages: AgentMessage[] = [];
 	for (let i = boundaryStart; i < historyEnd; i++) {
 		const msg = getMessageFromEntry(entries[i]);
 		if (msg) historyMessages.push(msg);
@@ -499,7 +499,7 @@ export async function compact(
 	}
 
 	// Extract messages for turn prefix summary (if splitting a turn)
-	const turnPrefixMessages: AppMessage[] = [];
+	const turnPrefixMessages: AgentMessage[] = [];
 	if (cutResult.isSplitTurn) {
 		for (let i = cutResult.turnStartIndex; i < cutResult.firstKeptEntryIndex; i++) {
 			const msg = getMessageFromEntry(entries[i]);
@@ -550,7 +550,7 @@ export async function compact(
  * Generate a summary for a turn prefix (when splitting a turn).
  */
 async function generateTurnPrefixSummary(
-	messages: AppMessage[],
+	messages: AgentMessage[],
 	model: Model<any>,
 	reserveTokens: number,
 	apiKey: string,

packages/coding-agent/src/core/hooks/types.ts

@@ -5,7 +5,7 @@
  * and interact with the user via UI primitives.
  */
 
-import type { AppMessage } from "@mariozechner/pi-agent-core";
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
 import type { ImageContent, Message, Model, TextContent, ToolResultMessage } from "@mariozechner/pi-ai";
 import type { Component } from "@mariozechner/pi-tui";
 import type { Theme } from "../../modes/interactive/theme/theme.js";
@@ -151,7 +151,7 @@ export type SessionEvent =
  * Event data for context event.
  * Fired before each LLM call, allowing hooks to modify context non-destructively.
  * Original session messages are NOT modified - only the messages sent to the LLM are affected.
- * Messages are already in LLM format (Message[], not AppMessage[]).
+ * Messages are already in LLM format (Message[], not AgentMessage[]).
  */
 export interface ContextEvent {
 	type: "context";
@@ -172,7 +172,7 @@ export interface AgentStartEvent {
  */
 export interface AgentEndEvent {
 	type: "agent_end";
-	messages: AppMessage[];
+	messages: AgentMessage[];
 }
 
 /**
@@ -190,7 +190,7 @@ export interface TurnStartEvent {
 export interface TurnEndEvent {
 	type: "turn_end";
 	turnIndex: number;
-	message: AppMessage;
+	message: AgentMessage;
 	toolResults: ToolResultMessage[];
 }
 

packages/coding-agent/src/core/messages.ts

@@ -1,11 +1,11 @@
 /**
  * Custom message types and transformers for the coding agent.
  *
- * Extends the base AppMessage type with coding-agent specific message types,
+ * Extends the base AgentMessage type with coding-agent specific message types,
  * and provides a transformer to convert them to LLM-compatible messages.
  */
 
-import type { AppMessage } from "@mariozechner/pi-agent-core";
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
 import type { Message } from "@mariozechner/pi-ai";
 
 // ============================================================================
@@ -56,14 +56,14 @@ declare module "@mariozechner/pi-agent-core" {
 /**
  * Type guard for BashExecutionMessage.
  */
-export function isBashExecutionMessage(msg: AppMessage | Message): msg is BashExecutionMessage {
+export function isBashExecutionMessage(msg: AgentMessage | Message): msg is BashExecutionMessage {
 	return (msg as BashExecutionMessage).role === "bashExecution";
 }
 
 /**
- * Type guard for HookAppMessage.
+ * Type guard for HookAgentMessage.
  */
-export function isHookMessage(msg: AppMessage | Message): msg is HookMessage {
+export function isHookMessage(msg: AgentMessage | Message): msg is HookMessage {
 	return (msg as HookMessage).role === "hookMessage";
 }
 
@@ -97,13 +97,13 @@ export function bashExecutionToText(msg: BashExecutionMessage): string {
 // ============================================================================
 
 /**
- * Transform AppMessages (including custom types) to LLM-compatible Messages.
+ * Transform AgentMessages (including custom types) to LLM-compatible Messages.
  *
  * This is used by:
  * - Agent's messageTransformer option (for prompt calls)
  * - Compaction's generateSummary (for summarization)
  */
-export function messageTransformer(messages: AppMessage[]): Message[] {
+export function messageTransformer(messages: AgentMessage[]): Message[] {
 	return messages
 		.map((m): Message | null => {
 			if (isBashExecutionMessage(m)) {

packages/coding-agent/src/core/session-manager.ts

@@ -1,4 +1,4 @@
-import type { AppMessage } from "@mariozechner/pi-agent-core";
+import type { AgentMessage } from "@mariozechner/pi-agent-core";
 import type { ImageContent, TextContent } from "@mariozechner/pi-ai";
 import { randomUUID } from "crypto";
 import {
@@ -36,7 +36,7 @@ export interface SessionEntryBase {
 
 export interface SessionMessageEntry extends SessionEntryBase {
 	type: "message";
-	message: AppMessage;
+	message: AgentMessage;
 }
 
 export interface ThinkingLevelChangeEntry extends SessionEntryBase {
@@ -130,7 +130,7 @@ export interface SessionTreeNode {
 }
 
 export interface SessionContext {
-	messages: AppMessage[];
+	messages: AgentMessage[];
 	thinkingLevel: string;
 	model: { provider: string; modelId: string } | null;
 }
@@ -154,7 +154,7 @@ export const SUMMARY_SUFFIX = `
 </summary>`;
 
 /** Exported for compaction.test.ts */
-export function createSummaryMessage(summary: string, timestamp: string): AppMessage {
+export function createSummaryMessage(summary: string, timestamp: string): AgentMessage {
 	return {
 		role: "user",
 		content: SUMMARY_PREFIX + summary + SUMMARY_SUFFIX,
@@ -162,8 +162,8 @@ export function createSummaryMessage(summary: string, timestamp: string): AppMes
 	};
 }
 
-/** Convert CustomMessageEntry to AppMessage format */
-function createCustomMessage(entry: CustomMessageEntry): AppMessage {
+/** Convert CustomMessageEntry to AgentMessage format */
+function createCustomMessage(entry: CustomMessageEntry): AgentMessage {
 	return {
 		role: "user",
 		content: entry.content,
@@ -323,7 +323,7 @@ export function buildSessionContext(
 	// 1. Emit summary first (entry = compaction)
 	// 2. Emit kept messages (from firstKeptEntryId up to compaction)
 	// 3. Emit messages after compaction
-	const messages: AppMessage[] = [];
+	const messages: AgentMessage[] = [];
 
 	if (compaction) {
 		// Emit summary first
@@ -595,7 +595,7 @@ export class SessionManager {
 	}
 
 	/** Append a message as child of current leaf, then advance leaf. Returns entry id. */
-	appendMessage(message: AppMessage): string {
+	appendMessage(message: AgentMessage): string {
 		const entry: SessionMessageEntry = {
 			type: "message",
 			id: generateId(this.byId),

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -6,7 +6,7 @@
 import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
-import type { AgentState, AppMessage } from "@mariozechner/pi-agent-core";
+import type { AgentMessage, AgentState } from "@mariozechner/pi-agent-core";
 import type { AssistantMessage, Message, OAuthProvider } from "@mariozechner/pi-ai";
 import type { SlashCommand } from "@mariozechner/pi-tui";
 import {
@@ -1051,7 +1051,7 @@ export class InteractiveMode {
 		this.ui.requestRender();
 	}
 
-	private addMessageToChat(message: AppMessage): void {
+	private addMessageToChat(message: AgentMessage): void {
 		if (isBashExecutionMessage(message)) {
 			const component = new BashExecutionComponent(message.command, this.ui);
 			if (message.output) {

packages/coding-agent/src/modes/rpc/rpc-client.ts

@@ -6,7 +6,7 @@
 
 import { type ChildProcess, spawn } from "node:child_process";
 import * as readline from "node:readline";
-import type { AgentEvent, AppMessage, Attachment, ThinkingLevel } from "@mariozechner/pi-agent-core";
+import type { AgentEvent, AgentMessage, Attachment, ThinkingLevel } from "@mariozechner/pi-agent-core";
 import type { SessionStats } from "../../core/agent-session.js";
 import type { BashResult } from "../../core/bash-executor.js";
 import type { CompactionResult } from "../../core/compaction.js";
@@ -349,9 +349,9 @@ export class RpcClient {
 	/**
 	 * Get all messages in the session.
 	 */
-	async getMessages(): Promise<AppMessage[]> {
+	async getMessages(): Promise<AgentMessage[]> {
 		const response = await this.send({ type: "get_messages" });
-		return this.getData<{ messages: AppMessage[] }>(response).messages;
+		return this.getData<{ messages: AgentMessage[] }>(response).messages;
 	}
 
 	// =========================================================================

packages/coding-agent/src/modes/rpc/rpc-types.ts

@@ -5,7 +5,7 @@
  * Responses and events are emitted as JSON lines on stdout.
  */
 
-import type { AppMessage, Attachment, ThinkingLevel } from "@mariozechner/pi-agent-core";
+import type { AgentMessage, Attachment, ThinkingLevel } from "@mariozechner/pi-agent-core";
 import type { Model } from "@mariozechner/pi-ai";
 import type { SessionStats } from "../../core/agent-session.js";
 import type { BashResult } from "../../core/bash-executor.js";
@@ -161,7 +161,7 @@ export type RpcResponse =
 	  }
 
 	// Messages
-	| { id?: string; type: "response"; command: "get_messages"; success: true; data: { messages: AppMessage[] } }
+	| { id?: string; type: "response"; command: "get_messages"; success: true; data: { messages: AgentMessage[] } }
 
 	// Error response (any command can fail)
 	| { id?: string; type: "response"; command: string; success: false; error: string };