Navie history symlinks don't work on Windows, cause a Navie failure

[kgilpin]

Error example

10896 [Stderr] Handling exception: {
10896 [Stderr]   code: 'EPERM',
10896 [Stderr]   message: "EPERM: operation not permitted, symlink '..\\messages\\bb5d3f14-b4ae-4049-a7ba-b7babf4feec8\\question.txt' -> 'C:\\Users\\dusti\\.appmap\\navie\\history\\threads\\9d435cd1-5d42-466d-b6e9-2a4ce58284c5\\sequence\\1725543743379.question.txt'",
10896 [Stderr]   data: {
10896 [Stderr]     data: {
10896 [Stderr]       stack: "Error: EPERM: operation not permitted, symlink '..\\messages\\bb5d3f14-b4ae-4049-a7ba-b7babf4feec8\\question.txt' -> 'C:\\Users\\dusti\\.appmap\\navie\\history\\threads\\9d435cd1-5d42-466d-b6e9-2a4ce58284c5\\sequence\\1725543743379.question.txt'"
10896 [Stderr]     }
10896 [Stderr]   }
10896 [Stderr] }
10896 [Stderr] Data: [object Object]

Patch 1

diff --git a/packages/cli/src/rpc/explain/navie/historyHelper.ts b/packages/cli/src/rpc/explain/navie/historyHelper.ts
index 68c561b1a..0d3664d6e 100644
--- a/packages/cli/src/rpc/explain/navie/historyHelper.ts
+++ b/packages/cli/src/rpc/explain/navie/historyHelper.ts
@@ -1,5 +1,4 @@
 import { homedir } from 'os';
-import { mkdirSync, existsSync } from 'fs';
 import History, { ThreadAccessError } from './history';
 import Thread from './thread';
 import { join } from 'path';
@@ -7,12 +6,9 @@ import { warn } from 'console';
 import configuration from '../../configuration';

 export function initializeHistory(): History {
-  const historyDir = join(homedir(), '.appmap', 'navie', 'history');
-  if (!existsSync(historyDir)) {
-    mkdirSync(historyDir, { recursive: true });
-  }
-  return new History(historyDir);
+  return new History(join(homedir(), '.appmap', 'navie', 'history'));
 }
+
 export async function loadThread(history: History, threadId: string): Promise<Thread> {
   let thread: Thread;

diff --git a/packages/cli/tests/unit/rpc/explain/historyHelper.spec.ts b/packages/cli/tests/unit/rpc/explain/historyHelper.spec.ts
deleted file mode 100644
index 517af6a7c..000000000
--- a/packages/cli/tests/unit/rpc/explain/historyHelper.spec.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import { mkdirSync, existsSync } from 'fs';
-import { join } from 'path';
-import { homedir } from 'os';
-import { initializeHistory } from '../../../../src/rpc/explain/navie/historyHelper';
-
-// eslint-disable-next-line @typescript-eslint/no-unsafe-return
-jest.mock('fs', () => ({
-  ...jest.requireActual('fs'),
-  mkdirSync: jest.fn(),
-  existsSync: jest.fn(),
-}));
-
-describe('historyHelper', () => {
-  beforeEach(() => jest.resetAllMocks());
-
-  it('creates history directory if it does not exist', () => {
-    const historyDir = join(homedir(), '.appmap', 'navie', 'history');
-    (existsSync as jest.Mock).mockReturnValue(false);
-
-    initializeHistory();
-
-    expect(mkdirSync).toHaveBeenCalledWith(historyDir, { recursive: true });
-  });
-
-  it('does not create history directory if it already exists', () => {
-    (existsSync as jest.Mock).mockReturnValue(true);
-
-    initializeHistory();
-
-    expect(mkdirSync).not.toHaveBeenCalled();
-  });
-});
diff --git a/packages/navie/CHANGELOG.md b/packages/navie/CHANGELOG.md
index b2e2cafca..d0b98e7d7 100644
--- a/packages/navie/CHANGELOG.md
+++ b/packages/navie/CHANGELOG.md
@@ -1,10 +1,3 @@
-# [@appland/navie-v1.27.1](https://github.com/getappmap/appmap-js/compare/@appland/navie-v1.27.0...@appland/navie-v1.27.1) (2024-09-04)
-
-
-### Bug Fixes
-
-* Don't retry on 422 with OpenAI completion ([91d9711](https://github.com/getappmap/appmap-js/commit/91d9711a46bbae3d587d3f8909d21f67a4d4dd07))
-
 # [@appland/navie-v1.27.0](https://github.com/getappmap/appmap-js/compare/@appland/navie-v1.26.1...@appland/navie-v1.27.0) (2024-09-03)

diff --git a/packages/navie/package.json b/packages/navie/package.json
index 69bb8f0b7..5eb2db0e3 100644
--- a/packages/navie/package.json
+++ b/packages/navie/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@appland/navie",
-  "version": "1.27.1",
+  "version": "1.27.0",
   "description": "",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

Patch 2

diff --git a/.gitignore b/.gitignore
index 14174ff1b..e5308338e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,5 +45,4 @@ notebooks
 tmp/appmap
 packages/*/tmp/
 *.appmap.json
-.navie

diff --git a/packages/cli/src/cmds/index/rpc.ts b/packages/cli/src/cmds/index/rpc.ts
index a4fe69d3b..221ea0155 100644
--- a/packages/cli/src/cmds/index/rpc.ts
+++ b/packages/cli/src/cmds/index/rpc.ts
@@ -10,7 +10,7 @@ import appmapFilter from '../../rpc/appmap/filter';
 import { RpcHandler } from '../../rpc/rpc';
 import metadata from '../../rpc/appmap/metadata';
 import sequenceDiagram from '../../rpc/appmap/sequenceDiagram';
-import { explainHandler, explainStatusHandler, loadThreadHandler } from '../../rpc/explain/explain';
+import { explainHandler, explainStatusHandler } from '../../rpc/explain/explain';
 import { buildNavieProvider, commonNavieArgsBuilder as navieBuilder } from '../navie';
 import RPCServer from './rpcServer';
 import appmapData from '../../rpc/appmap/data';
@@ -27,10 +27,6 @@ import { update } from '../../rpc/file/update';
 import { INavieProvider } from '../../rpc/explain/navie/inavie';
 import { navieMetadataV1 } from '../../rpc/navie/metadata';
 import { navieSuggestHandlerV1 } from '../../rpc/navie/suggest';
-import { initializeHistory } from '../../rpc/explain/navie/historyHelper';
-import History from '../../rpc/explain/navie/history';
-import { join } from 'path';
-import { homedir } from 'os';

 export const command = 'rpc';
 export const describe = 'Run AppMap JSON-RPC server';
@@ -63,7 +59,6 @@ export function rpcMethods(navie: INavieProvider, codeEditor?: string): RpcHandl
     sequenceDiagram(),
     explainHandler(navie, codeEditor),
     explainStatusHandler(),
-    loadThreadHandler(),
     update(navie),
     setConfigurationV1(),
     getConfigurationV1(),
@@ -87,12 +82,6 @@ export const handler = async (argv: HandlerArguments) => {
   loadConfiguration(false);
   await configureRpcDirectories(argv.directory);

-  {
-    const history = initializeHistory();
-    const oldHistoryDir = join(homedir(), '.appmap', 'navie', 'history');
-    await History.migrate(oldHistoryDir, history);
-  }
-
   const rpcServer = new RPCServer(argv.port, rpcMethods(navie, codeEditor));
   rpcServer.start();
 };
diff --git a/packages/cli/src/cmds/navie.ts b/packages/cli/src/cmds/navie.ts
index 6fa66fcc7..3191a3c1a 100644
--- a/packages/cli/src/cmds/navie.ts
+++ b/packages/cli/src/cmds/navie.ts
@@ -27,7 +27,6 @@ interface ExplainArgs {
   navieProvider?: string;
   logNavie?: boolean;
   prompt?: string;
-  threadId?: string;
 }

 interface NavieCommonCmdArgs extends ExplainArgs {
@@ -80,11 +79,6 @@ export function commonNavieArgsBuilder<T>(args: yargs.Argv<T>): yargs.Argv<T & N
       type: 'string',
       // Allow this to be any string. The code editor brand name may be a clue to the language
       // in use, or the user's intent.
-    })
-    .option('thread-id', {
-      describe:
-        'The thread ID to use for the question. If not provided, a new thread ID will be allocated. Valid only for local Navie provider.',
-      type: 'string',
     });
 }

@@ -144,8 +138,6 @@ export function buildNavieProvider(argv: ExplainArgs) {
   ) => {
     loadConfiguration(false);
     const navie = new LocalNavie(contextProvider, projectInfoProvider, helpProvider);
-    if (argv.threadId) navie.setThreadId(argv.threadId);
-
     applyAIOptions(navie);

     let START: number | undefined;
@@ -172,11 +164,6 @@ export function buildNavieProvider(argv: ExplainArgs) {
     loadConfiguration(true);
     const navie = new RemoteNavie(contextProvider, projectInfoProvider, helpProvider);
     applyAIOptions(navie);
-
-    if (argv.threadId) {
-      warn(`Ignoring --thread-id option for remote Navie provider`);
-    }
-
     return navie;
   };

diff --git a/packages/cli/src/fulltext/SourceIndex.ts b/packages/cli/src/fulltext/SourceIndex.ts
index a6320c30f..455240bd8 100644
--- a/packages/cli/src/fulltext/SourceIndex.ts
+++ b/packages/cli/src/fulltext/SourceIndex.ts
@@ -10,7 +10,7 @@ import { existsSync } from 'fs';
 import { FileIndexMatch } from './FileIndex';
 import { verbose } from '../utils';
 import { readFile } from 'fs/promises';
-import { basename, join } from 'path';
+import { join } from 'path';
 import queryKeywords from './queryKeywords';

 const debug = makeDebug('appmap:source-index');
@@ -128,7 +128,7 @@ export class SourceIndex {
         try {
           debug(`Indexing document ${fileName} from ${from} to ${to}`);

-          const terms = queryKeywords([fileName, chunk.pageContent]).join(' ');
+          const terms = queryKeywords([chunk.pageContent]).join(' ');
           this.#insert.run(directory, fileName, from, to, chunk.pageContent, terms);
         } catch (error) {
           console.warn(`Error indexing document ${fileName} from ${from} to ${to}`);
diff --git a/packages/cli/src/rpc/explain/explain.ts b/packages/cli/src/rpc/explain/explain.ts
index ff8620ccb..a20328d37 100644
--- a/packages/cli/src/rpc/explain/explain.ts
+++ b/packages/cli/src/rpc/explain/explain.ts
@@ -21,9 +21,6 @@ import { getLLMConfiguration } from '../llmConfiguration';
 import detectAIEnvVar from '../../cmds/index/aiEnvVar';
 import reportFetchError from './navie/report-fetch-error';
 import { LRUCache } from 'lru-cache';
-import { initializeHistory } from './navie/historyHelper';
-import { ThreadAccessError } from './navie/history';
-import Thread from './navie/thread';

 const searchStatusByUserMessageId = new Map<string, ExplainRpc.ExplainStatusResponse>();

@@ -318,21 +315,6 @@ export function explainStatus(userMessageId: string): ExplainRpc.ExplainStatusRe
   return searchStatus;
 }

-export async function loadThread(threadId: string): Promise<ExplainRpc.LoadThreadResponse> {
-  const history = initializeHistory();
-
-  let thread: Thread;
-  try {
-    thread = await history.load(threadId);
-  } catch (e) {
-    if (e instanceof ThreadAccessError) throw new RpcError(404, `Thread ${threadId} not found`);
-
-    throw e;
-  }
-
-  return thread;
-}
-
 const explainHandler: (
   navieProvider: INavieProvider,
   codeEditor: string | undefined
@@ -367,16 +349,4 @@ const explainStatusHandler: () => RpcHandler<
   };
 };

-const loadThreadHandler: () => RpcHandler<
-  ExplainRpc.LoadThreadOptions,
-  ExplainRpc.LoadThreadResponse
-> = () => {
-  return {
-    name: ExplainRpc.ExplainThreadLoadFunctionName,
-    handler: async (options: ExplainRpc.LoadThreadOptions) => {
-      return loadThread(options.threadId);
-    },
-  };
-};
-
-export { explainHandler, explainStatusHandler, loadThreadHandler };
+export { explainHandler, explainStatusHandler };
diff --git a/packages/cli/src/rpc/explain/navie/history.ts b/packages/cli/src/rpc/explain/navie/history.ts
deleted file mode 100644
index 48b3c4138..000000000
--- a/packages/cli/src/rpc/explain/navie/history.ts
+++ /dev/null
@@ -1,351 +0,0 @@
-import { join } from 'path';
-import Thread from './thread';
-import { mkdir, readdir, readFile, readlink, rm, symlink, writeFile } from 'fs/promises';
-import { warn } from 'console';
-import { Message } from '@appland/navie';
-import { exists } from '../../../utils';
-import { OpenMode } from 'fs';
-import configuration from '../../configuration';
-
-export const THREAD_ID_REGEX = /^[0-9a-f]{4,16}(-[0-9a-f]{4,16}){3,6}$/;
-
-export class ThreadAccessError extends Error {
-  constructor(public readonly threadId: string, public action: string, public cause?: Error) {
-    super(ThreadAccessError.errorMessage(threadId, action, cause));
-  }
-
-  static errorMessage(threadId: string, action: string, cause?: Error): string {
-    const messages = [`Failed to ${action} thread ${threadId}`];
-    if (cause) messages.push(cause.message);
-    return messages.join(': ');
-  }
-}
-
-export enum QuestionField {
-  Question = 'question',
-  CodeSelection = 'codeSelection',
-  Prompt = 'prompt',
-}
-
-export enum ResponseField {
-  AssistantMessageId = 'assistantMessageId',
-  Answer = 'answer',
-}
-
-type SequenceFile = { timestamp: number; messageId: string };
-
-const parseSequenceFile = (dir: string): SequenceFile => ({
-  timestamp: parseInt(dir.split('.')[0]),
-  messageId: dir.split('.')[1],
-});
-
-export default class History {
-  private firstResponse = new Map<string, number>();
-
-  public constructor(public readonly directory: string) {}
-
-  async question(
-    threadId: string,
-    userMessageId: string,
-    question: string,
-    codeSelection: string | undefined,
-    prompt: string | undefined,
-    extensions: Record<QuestionField, string> = {
-      question: 'txt',
-      codeSelection: 'txt',
-      prompt: 'md',
-    }
-  ) {
-    const threadDir = await this.ensureThreadDir(threadId);
-    const messageDir = await History.findOrCreateMessageDir(threadDir, userMessageId);
-
-    const writeMessageFile = async (field: QuestionField, content: string) => {
-      const messageFile = join(messageDir, [field, extensions[field]].join('.'));
-      await writeFile(messageFile, content);
-
-      const sequenceDir = join(threadDir, 'sequence');
-      await mkdir(sequenceDir, { recursive: true });
-      const sequenceFile = join(
-        sequenceDir,
-        [Date.now().toString(), field, extensions[field]].join('.')
-      );
-      await History.createSymlinkIfNotExists(
-        join('..', 'messages', userMessageId, [field, extensions[field]].join('.')),
-        sequenceFile
-      );
-    };
-
-    await writeMessageFile(QuestionField.Question, question);
-    if (codeSelection) await writeMessageFile(QuestionField.CodeSelection, codeSelection);
-    if (prompt) await writeMessageFile(QuestionField.Prompt, prompt);
-
-    const date = new Date().toISOString().split('T')[0];
-    const dateDir = join(this.directory, 'dates', date);
-    await mkdir(dateDir, { recursive: true });
-    const dateThreadFile = join(dateDir, threadId);
-    await History.createSymlinkIfNotExists(threadDir, dateThreadFile);
-  }
-
-  async token(
-    threadId: string,
-    userMessageId: string,
-    assistantMessageId: string,
-    token: string,
-    extensions: Record<ResponseField, string> = {
-      answer: 'md',
-      assistantMessageId: 'txt',
-    }
-  ) {
-    const threadDir = await this.ensureThreadDir(threadId);
-    const messageDir = await History.findOrCreateMessageDir(threadDir, userMessageId);
-    const timestamp = Date.now();
-
-    const writeMessageFile = async (
-      field: ResponseField,
-      content: string,
-      modeFlag: { flag: OpenMode | undefined } = { flag: 'w' }
-    ) => {
-      const messageFile = join(messageDir, [field, extensions[field]].join('.'));
-      await writeFile(messageFile, content, modeFlag);
-
-      const sequenceDir = join(threadDir, 'sequence');
-      await mkdir(sequenceDir, { recursive: true });
-      const sequenceFile = join(sequenceDir, [timestamp, field, extensions[field]].join('.'));
-      await History.createSymlinkIfNotExists(
-        join('..', 'messages', userMessageId, [field, extensions[field]].join('.')),
-        sequenceFile
-      );
-    };
-
-    if (!this.firstResponse.has(assistantMessageId)) {
-      this.firstResponse.set(assistantMessageId, timestamp);
-
-      await writeMessageFile(ResponseField.AssistantMessageId, assistantMessageId);
-      await writeMessageFile(ResponseField.Answer, token, { flag: 'a' });
-    } else {
-      const messageFile = join(
-        messageDir,
-        [ResponseField.Answer, extensions[ResponseField.Answer]].join('.')
-      );
-      await writeFile(messageFile, token, { flag: 'a' });
-    }
-  }
-
-  async load(threadId: string): Promise<Thread> {
-    const threadDir = join(this.directory, 'threads', threadId);
-    let projectDirectories: string[];
-    try {
-      projectDirectories = (await readFile(join(threadDir, 'projectDirectories.txt'), 'utf-8'))
-        .split('\n')
-        .filter(Boolean);
-    } catch (e) {
-      throw History.threadAccessError(threadId, 'load', e);
-    }
-
-    const messagesDir = join(this.directory, 'threads', threadId, 'messages');
-    const sequenceDir = join(this.directory, 'threads', threadId, 'sequence');
-
-    let messageSequenceFiles: string[];
-    try {
-      messageSequenceFiles = await readdir(sequenceDir);
-    } catch (e) {
-      throw History.threadAccessError(threadId, 'load', e);
-    }
-
-    messageSequenceFiles.sort(
-      (a, b) => parseSequenceFile(a).timestamp - parseSequenceFile(b).timestamp
-    );
-    const contentFileFieldName = (contentFile: string) => contentFile.split('.')[0];
-
-    const timestamp =
-      messageSequenceFiles.length > 0
-        ? parseSequenceFile(messageSequenceFiles[0]).timestamp
-        : Date.now();
-    const thread = new Thread(threadId, timestamp, projectDirectories);
-
-    const userMessageIds = new Set<string>();
-    for (const sequenceFile of messageSequenceFiles) {
-      const sequenceFilePath = join(sequenceDir, sequenceFile);
-      // Resolve the file name that the symlink points to.
-      let messageFile: string;
-      try {
-        messageFile = await readlink(sequenceFilePath);
-      } catch (e) {
-        warn(e);
-        continue;
-      }
-      const messageFileTokens = messageFile.split('/');
-      const userMessageId = messageFileTokens[messageFileTokens.length - 2];
-      userMessageIds.add(userMessageId);
-    }
-
-    for (const userMessageId of userMessageIds) {
-      const contentFiles = await readdir(join(messagesDir, userMessageId));
-      let threadTimestamp: number | undefined;
-
-      const readRecordFile = async (recordName: string): Promise<string | undefined> => {
-        const matchingContentFile = contentFiles.find(
-          (file) => contentFileFieldName(file) === recordName
-        );
-        if (!matchingContentFile) return undefined;
-
-        const contentFile = join(messagesDir, userMessageId, matchingContentFile);
-
-        // Read the file timestamp to use as the thread timestamp.
-        try {
-          const contentFileStat = await readFile(contentFile, 'utf-8');
-          const messageTimestamp = parseInt(contentFileStat.split('.')[0]);
-          if (!threadTimestamp || messageTimestamp < threadTimestamp)
-            threadTimestamp = messageTimestamp;
-        } catch (e) {
-          throw History.threadAccessError(threadId, 'read', e);
-        }
-
-        try {
-          return await readFile(contentFile, 'utf-8');
-        } catch (e) {
-          throw History.threadAccessError(threadId, 'read', e);
-        }
-      };
-
-      const question = await readRecordFile('question');
-      const codeSelection = await readRecordFile('codeSelection');
-      const prompt = await readRecordFile('prompt');
-      const assistantMessageId = await readRecordFile('assistantMessageId');
-      const answer = await readRecordFile('answer');
-
-      if (userMessageId && question)
-        thread.question(
-          threadTimestamp ?? Date.now(),
-          userMessageId,
-          question,
-          codeSelection,
-          prompt
-        );
-      if (userMessageId && assistantMessageId && answer) {
-        thread.answer(userMessageId, assistantMessageId, answer);
-      }
-    }
-
-    return thread;
-  }
-
-  // Message are stored within threadDir/message in subdirectories. Each subdirectory is named
-  // by joining the timestamp and the user message id with a period. This naming convention
-  // makes it easy to view and sort the messages in chronological order.
-  private static async findOrCreateMessageDir(
-    threadDir: string,
-    userMessageId: string
-  ): Promise<string> {
-    // List message directories in the thread directory.
-    const messagesDir = join(threadDir, 'messages');
-    await mkdir(messagesDir, { recursive: true });
-
-    let messageIds: string[];
-    try {
-      messageIds = await readdir(messagesDir);
-    } catch (e) {
-      throw this.threadAccessError(threadDir, 'initialize storage for', e);
-    }
-
-    // Find the message directory for the user message.
-    if (messageIds.includes(userMessageId)) {
-      return join(messagesDir, userMessageId);
-    }
-
-    const messagePath = join(messagesDir, userMessageId);
-    await mkdir(messagePath, { recursive: true });
-    return messagePath;
-  }
-
-  private static async createSymlinkIfNotExists(target: string, path: string) {
-    try {
-      await readlink(path);
-    } catch (e) {
-      const err = e as Error & { code?: string };
-      if (err.code === 'ENOENT') {
-        await symlink(target, path);
-      } else if (err.code === 'EEXIST') {
-        // Symlink already exists, do nothing.
-      } else {
-        throw err;
-      }
-    }
-  }
-
-  private async ensureThreadDir(threadId: string): Promise<string> {
-    const threadDir = join(this.directory, 'threads', threadId);
-    await mkdir(threadDir, { recursive: true });
-    const projectDirectoriesFile = join(threadDir, 'projectDirectories.txt');
-    if (!(await exists(projectDirectoriesFile))) {
-      const projectDirectories = configuration().projectDirectories;
-      await writeFile(projectDirectoriesFile, projectDirectories.join('\n'));
-    }
-    return threadDir;
-  }
-
-  static threadAccessError(threadId: string, action: string, e: any): ThreadAccessError {
-    const err = e as Error & { code?: string };
-    if (err.code === 'ENOENT') warn(`Thread ${threadId} not found`);
-
-    return new ThreadAccessError(threadId, action, e instanceof Error ? e : undefined);
-  }
-
-  // In the old-style history format, threads are stored in files named by their thread id
-  // and timestamp. In the new-style history format, threads are stored in files named by
-  // their thread id, and the thread file is symlinked to a file named for the date of the thread.
-  static async migrate(
-    oldDirectory: string,
-    history: History,
-    options: { cleanup: boolean } = { cleanup: true }
-  ): Promise<void> {
-    // List the contents of the old directory. Each one is a threadId directory, containing
-    // timestamped messages.
-    const threadIds = (await readdir(oldDirectory)).filter(
-      // Match UUIDs like 5278527e-c4ed-4e45-9fb6-372ed6a036f6 in the thread dir
-      // Being careful not to touch anything else, like the dates and threads directories that are
-      // created in the new history format.
-      (dir) => dir.match(THREAD_ID_REGEX)
-    );
-
-    const threadFileAsTimestamp = (threadFile: string) => parseInt(threadFile.split('.')[0]);
-
-    for (const threadId of threadIds) {
-      warn(`[history] Migrating thread ${threadId} from old history format`);
-
-      const oldThreadDir = join(oldDirectory, threadId);
-      const threadFiles = await readdir(oldThreadDir);
-      threadFiles.sort((a, b) => threadFileAsTimestamp(a) - threadFileAsTimestamp(b));
-
-      let lastUserMessageId: string | undefined;
-      for (const threadFile of threadFiles) {
-        const timestamp = threadFileAsTimestamp(threadFile);
-        // MessageIds are not available, so fake them with timestamps.
-        const messageId = timestamp.toString();
-        const messageFile = join(oldThreadDir, threadFile);
-        const messageStr = await readFile(messageFile, 'utf-8');
-        try {
-          const message = JSON.parse(messageStr) as Message;
-          if (message.role === 'user') {
-            lastUserMessageId = messageId;
-            // codeSelection and prompt are not available in the old format.
-            await history.question(threadId, messageId, message.content, undefined, undefined);
-          } else if (message.role === 'assistant' || message.role === 'system') {
-            if (lastUserMessageId)
-              await history.token(threadId, lastUserMessageId, messageId, message.content);
-          }
-        } catch (e) {
-          warn(`[history] Failed to parse message from ${messageFile}. Skipping.`);
-          warn(e);
-        }
-
-        // Project directories are unknown, so overwrite the file contents with empty text.
-        const newThreadDir = join(history.directory, 'threads', threadId);
-        if (await exists(newThreadDir))
-          await writeFile(join(newThreadDir, 'projectDirectories.txt'), '');
-      }
-
-      if (options.cleanup) await rm(oldThreadDir, { recursive: true });
-    }
-  }
-}
diff --git a/packages/cli/src/rpc/explain/navie/historyHelper.ts b/packages/cli/src/rpc/explain/navie/historyHelper.ts
deleted file mode 100644
index 0d3664d6e..000000000
--- a/packages/cli/src/rpc/explain/navie/historyHelper.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import { homedir } from 'os';
-import History, { ThreadAccessError } from './history';
-import Thread from './thread';
-import { join } from 'path';
-import { warn } from 'console';
-import configuration from '../../configuration';
-
-export function initializeHistory(): History {
-  return new History(join(homedir(), '.appmap', 'navie', 'history'));
-}
-
-export async function loadThread(history: History, threadId: string): Promise<Thread> {
-  let thread: Thread;
-
-  try {
-    thread = await history.load(threadId);
-  } catch (e) {
-    if (e instanceof ThreadAccessError) {
-      warn(`[remote-navie] Creating new thread ${threadId} (thread not found)`);
-      const projectDirectories = configuration().projectDirectories;
-      thread = new Thread(threadId, Date.now(), projectDirectories);
-    } else {
-      throw e;
-    }
-  }
-
-  return thread;
-}
diff --git a/packages/cli/src/rpc/explain/navie/navie-local.ts b/packages/cli/src/rpc/explain/navie/navie-local.ts
index f2edab2ae..5e146a148 100644
--- a/packages/cli/src/rpc/explain/navie/navie-local.ts
+++ b/packages/cli/src/rpc/explain/navie/navie-local.ts
@@ -1,7 +1,10 @@
 import { log, warn } from 'console';
 import EventEmitter from 'events';
+import { mkdir, readFile, readdir, writeFile } from 'fs/promises';
 import { randomUUID } from 'crypto';
-import { ContextV2, Navie, Help, ProjectInfo, navie } from '@appland/navie';
+import { join } from 'path';
+import { homedir } from 'os';
+import { ContextV2, Navie, Help, Message, ProjectInfo, navie } from '@appland/navie';

 import INavie from './inavie';
 import Telemetry from '../../../telemetry';
@@ -14,8 +17,45 @@ import {
 } from '@appland/client';
 import reportFetchError from './report-fetch-error';
 import assert from 'assert';
-import { initializeHistory, loadThread } from './historyHelper';
-import { THREAD_ID_REGEX } from './history';
+
+class LocalHistory {
+  constructor(public readonly threadId: string) {}
+
+  async saveMessage(message: Message) {
+    if (!['user', 'assistant'].includes(message.role))
+      throw new Error(`Invalid message role for conversation history : ${message.role}`);
+
+    await this.initHistory();
+    const timestampNumber = Date.now();
+    const historyFile = join(this.historyDir, `${timestampNumber}.json`);
+    await writeFile(historyFile, JSON.stringify(message, null, 2));
+  }
+
+  async restoreMessages(): Promise<Message[]> {
+    await this.initHistory();
+    const historyFiles = (await readdir(this.historyDir)).sort();
+    const history: Message[] = [];
+    for (const historyFile of historyFiles) {
+      const historyPath = join(this.historyDir, historyFile);
+      const historyString = await readFile(historyPath, 'utf-8');
+      const message = JSON.parse(historyString);
+      // Fix messages that were miscategorized.
+      if (message.role === 'system') {
+        message.role = 'assistant';
+      }
+      history.push(message);
+    }
+    return history;
+  }
+
+  protected async initHistory() {
+    await mkdir(this.historyDir, { recursive: true });
+  }
+
+  protected get historyDir() {
+    return join(homedir(), '.appmap', 'navie', 'history', this.threadId);
+  }
+}

 const OPTION_SETTERS: Record<
   string,
@@ -38,8 +78,6 @@ const OPTION_SETTERS: Record<
 export default class LocalNavie extends EventEmitter implements INavie {
   public navieOptions = new Navie.NavieOptions();

-  assignedThreadId: string | undefined;
-
   constructor(
     private readonly contextProvider: ContextV2.ContextProvider,
     private readonly projectInfoProvider: ProjectInfo.ProjectInfoProvider,
@@ -48,14 +86,6 @@ export default class LocalNavie extends EventEmitter implements INavie {
     super();
   }

-  // Sets a thread id to use with the request.
-  // The caller is responsible for ensuring that the thread id is a unique, valid uuid.
-  setThreadId(threadId: string) {
-    if (!THREAD_ID_REGEX.test(threadId)) throw new Error(`Invalid thread id: ${threadId}`);
-
-    this.assignedThreadId = threadId;
-  }
-
   get providerName() {
     return 'local';
   }
@@ -76,15 +106,9 @@ export default class LocalNavie extends EventEmitter implements INavie {
     prompt?: string
   ): Promise<void> {
     if (!threadId) {
-      if (this.assignedThreadId) {
-        warn(`[local-navie] No threadId provided for question. Using client-specified threadId.`);
-        // eslint-disable-next-line no-param-reassign
-        threadId = this.assignedThreadId;
-      } else {
-        warn(`[local-navie] No threadId provided for question. Allocating a new threadId.`);
-        // eslint-disable-next-line no-param-reassign
-        threadId = randomUUID();
-      }
+      warn(`[local-navie] No threadId provided for question. Allocating a new threadId.`);
+      // eslint-disable-next-line no-param-reassign
+      threadId = randomUUID();
     }

     let userMessageId: string;
@@ -116,8 +140,7 @@ export default class LocalNavie extends EventEmitter implements INavie {
         )?.id ?? randomUUID();
     }

-    const history = initializeHistory();
-    const thread = await loadThread(history, threadId);
+    const history = new LocalHistory(threadId);

     this.#reportConfigTelemetry();
     log(`[local-navie] Processing question ${userMessageId} in thread ${threadId}`);
@@ -130,7 +153,8 @@ export default class LocalNavie extends EventEmitter implements INavie {
         prompt,
       };

-      await history.question(threadId, userMessageId, question, codeSelection, prompt);
+      const messages = await history.restoreMessages();
+      await history.saveMessage({ content: question, role: 'user' });

       const startTime = Date.now();

@@ -140,7 +164,7 @@ export default class LocalNavie extends EventEmitter implements INavie {
         this.projectInfoProvider,
         this.helpProvider,
         this.navieOptions,
-        thread.messages
+        messages
       );

       let agentName: string | undefined;
@@ -153,7 +177,6 @@ export default class LocalNavie extends EventEmitter implements INavie {
       const response = new Array<string>();
       for await (const token of navieFn.execute()) {
         response.push(token);
-        await history.token(threadId, userMessageId, agentMessageId, token);
         this.emit('token', token, agentMessageId);
       }
       const endTime = Date.now();
@@ -161,6 +184,8 @@ export default class LocalNavie extends EventEmitter implements INavie {

       warn(`[local-navie] Completed question ${userMessageId} in ${duration}ms`);

+      await history.saveMessage({ content: response.join(''), role: 'assistant' });
+
       {
         const userMessage: UpdateUserMessage = {
           agentName,
diff --git a/packages/cli/src/rpc/explain/navie/navie-remote.ts b/packages/cli/src/rpc/explain/navie/navie-remote.ts
index 4e2472c86..2101d9747 100644
--- a/packages/cli/src/rpc/explain/navie/navie-remote.ts
+++ b/packages/cli/src/rpc/explain/navie/navie-remote.ts
@@ -6,126 +6,8 @@ import { ContextV1, ContextV2, Help, ProjectInfo } from '@appland/navie';
 import { verbose } from '../../../utils';
 import { default as INavie } from './inavie';
 import assert from 'assert';
-import { initializeHistory, loadThread } from './historyHelper';
-import Thread from './thread';
-import History from './history';
-
-export class RemtoteCallbackHandler {
-  thread: Thread | undefined;
-  userMessageId: string | undefined;
-  assistantMessageId: string | undefined;
-  tokens: string[] = [];
-
-  constructor(
-    private readonly history: History,
-    private readonly contextProvider: ContextV2.ContextProvider,
-    private readonly projectInfoProvider: ProjectInfo.ProjectInfoProvider,
-    private readonly helpProvider: Help.HelpProvider
-  ) {}
-
-  async onAck(
-    assignedUserMessageId: string,
-    threadId: string,
-    question: string,
-    codeSelection?: string,
-    prompt?: string
-  ): Promise<void> {
-    if (verbose())
-      warn(`Explain received ack (userMessageId=${assignedUserMessageId}, threadId=${threadId})`);
-
-    this.thread = await loadThread(this.history, threadId);
-    this.userMessageId = assignedUserMessageId;
-    await this.history.question(threadId, this.userMessageId, question, codeSelection, prompt);
-  }
-
-  async onToken(token: string, messageId: string): Promise<void> {
-    if (!this.assistantMessageId) this.assistantMessageId = messageId;
-
-    this.tokens.push(token);
-
-    if (this.thread && this.userMessageId)
-      await this.history.token(
-        this.thread.threadId,
-        this.userMessageId,
-        this.assistantMessageId,
-        token
-      );
-    else warn(`[remote-navie] Received token but no thread is available to store it`);
-  }
-
-  async onRequestContext(
-    data: Record<string, unknown>
-  ): Promise<Record<string, unknown> | unknown[]> {
-    try {
-      if (data.type === 'search') {
-        const { version } = data;
-        const isVersion1 = !version || version === 1;
-
-        // ContextV2.ContextRequest is a superset of ContextV1.ContextRequest, so whether the input
-        // version is V1 or V2, we can treat it as V2.
-        const contextRequestV2: ContextV2.ContextRequest = data as ContextV2.ContextRequest;
-
-        const responseV2: ContextV2.ContextResponse = await this.contextProvider({
-          ...contextRequestV2,
-          type: 'search',
-          version: 2,
-        });
-
-        if (isVersion1) {
-          // Adapt from V2 response back to V1. Some data may be lost in this process.
-          const responseV1: ContextV1.ContextResponse = {
-            sequenceDiagrams: responseV2
-              .filter((item) => item.type === ContextV2.ContextItemType.SequenceDiagram)
-              .map((item) => item.content),
-            codeSnippets: responseV2
-              .filter((item) => item.type === ContextV2.ContextItemType.CodeSnippet)
-              .reduce((acc, item) => {
-                assert(item.type === ContextV2.ContextItemType.CodeSnippet);
-                if (ContextV2.isFileContextItem(item)) {
-                  acc[item.location] = item.content;
-                }
-                return acc;
-              }, {} as Record<string, string>),
-            codeObjects: responseV2
-              .filter((item) => item.type === ContextV2.ContextItemType.DataRequest)
-              .map((item) => item.content),
-          };
-          return responseV1;
-        } else {
-          return responseV2;
-        }
-      }
-      if (data.type === 'projectInfo') {
-        return (
-          (await this.projectInfoProvider(data as unknown as ProjectInfo.ProjectInfoRequest)) ?? {}
-        );
-      }
-      if (data.type === 'help') {
-        return (await this.helpProvider(data as unknown as Help.HelpRequest)) || {};
-      } else {
-        warn(`Unhandled context request type: ${data.type}`);
-        // A response is required from this function.
-        return {};
-      }
-    } catch (e) {
-      warn(`Explain context function ${JSON.stringify(data)} threw an error: ${e}`);
-      return {};
-    }
-  }
-
-  // eslint-disable-next-line @typescript-eslint/no-misused-promises
-  onComplete(): void {
-    if (verbose()) warn(`Explain is complete`);
-  }
-
-  onError(err: Error): void {
-    if (verbose()) warn(`Error handled by Explain: ${err}`);
-  }
-}

 export default class RemoteNavie extends EventEmitter implements INavie {
-  private history = initializeHistory();
-
   constructor(
     private contextProvider: ContextV2.ContextProvider,
     private projectInfoProvider: ProjectInfo.ProjectInfoProvider,
@@ -142,53 +24,95 @@ export default class RemoteNavie extends EventEmitter implements INavie {
     throw new Error(`RemoteNavie does not support option '${key}'`);
   }

-  async ask(threadId: string, question: string, codeSelection?: string, prompt?: string) {
-    const callbackHandler = new RemtoteCallbackHandler(
-      this.history,
-      this.contextProvider,
-      this.projectInfoProvider,
-      this.helpProvider
-    );
-
-    const onAck = async (userMessageId: string, threadId: string) => {
-      await callbackHandler.onAck(userMessageId, threadId, question, codeSelection, prompt);
-
-      this.emit('ack', userMessageId, threadId);
-    };
-
-    const onToken = async (token: string, messageId: string): Promise<void> => {
-      await callbackHandler.onToken(token, messageId);
-
-      this.emit('token', token, messageId);
-    };
-
-    const onRequestContext = async (
-      data: Record<string, unknown>
-    ): Promise<Record<string, unknown> | unknown[]> => {
-      return await callbackHandler.onRequestContext(data);
-    };
-
-    const onComplete = () => {
-      callbackHandler.onComplete();
-
-      this.emit('complete');
-    };
-
-    const onError = (err: Error) => {
-      callbackHandler.onError(err);
-
-      this.emit('error', err);
-    };
-
-    const callbacksObj = {
-      onAck,
-      onToken,
-      onRequestContext,
-      onComplete,
-      onError,
-    };
-
-    (await AI.connect(callbacksObj)).inputPrompt(
+  async ask(
+    threadId: string,
+    question: string,
+    codeSelection?: string,
+    prompt?: string
+  ) {
+    if (prompt) {
+      warn(`RemoteNavie does not support a custom prompt option.`);
+    }
+    (
+      await AI.connect({
+        onAck: (userMessageId, threadId) => {
+          if (verbose())
+            warn(`Explain received ack (userMessageId=${userMessageId}, threadId=${threadId})`);
+          this.emit('ack', userMessageId, threadId);
+        },
+        onToken: (token, _messageId) => {
+          this.emit('token', token);
+        },
+        onRequestContext: async (data) => {
+          try {
+            if (data.type === 'search') {
+              const { version } = data;
+              const isVersion1 = !version || version === 1;
+
+              // ContextV2.ContextRequest is a superset of ContextV1.ContextRequest, so whether the input
+              // version is V1 or V2, we can treat it as V2.
+              const contextRequestV2: ContextV2.ContextRequest = data as ContextV2.ContextRequest;
+
+              const responseV2: ContextV2.ContextResponse = await this.contextProvider({
+                ...contextRequestV2,
+                type: 'search',
+                version: 2,
+              });
+
+              if (isVersion1) {
+                // Adapt from V2 response back to V1. Some data may be lost in this process.
+                const responseV1: ContextV1.ContextResponse = {
+                  sequenceDiagrams: responseV2
+                    .filter((item) => item.type === ContextV2.ContextItemType.SequenceDiagram)
+                    .map((item) => item.content),
+                  codeSnippets: responseV2
+                    .filter((item) => item.type === ContextV2.ContextItemType.CodeSnippet)
+                    .reduce((acc, item) => {
+                      assert(item.type === ContextV2.ContextItemType.CodeSnippet);
+                      if (ContextV2.isFileContextItem(item)) {
+                        acc[item.location] = item.content;
+                      }
+                      return acc;
+                    }, {} as Record<string, string>),
+                  codeObjects: responseV2
+                    .filter((item) => item.type === ContextV2.ContextItemType.DataRequest)
+                    .map((item) => item.content),
+                };
+                return responseV1;
+              } else {
+                return responseV2;
+              }
+            }
+            if (data.type === 'projectInfo') {
+              return (
+                (await this.projectInfoProvider(
+                  data as unknown as ProjectInfo.ProjectInfoRequest
+                )) || {}
+              );
+            }
+            if (data.type === 'help') {
+              return (await this.helpProvider(data as unknown as Help.HelpRequest)) || {};
+            } else {
+              warn(`Unhandled context request type: ${data.type}`);
+              // A response is required from this function.
+              return {};
+            }
+          } catch (e) {
+            warn(`Explain context function ${JSON.stringify(data)} threw an error: ${e}`);
+            // TODO: Report an error object instead?
+            return {};
+          }
+        },
+        onComplete: () => {
+          if (verbose()) warn(`Explain is complete`);
+          this.emit('complete');
+        },
+        onError: (err: Error) => {
+          if (verbose()) warn(`Error handled by Explain: ${err}`);
+          this.emit('error', err);
+        },
+      })
+    ).inputPrompt(
       { question: question, codeSelection: codeSelection },
       { threadId, tool: 'explain' }
     );
diff --git a/packages/cli/src/rpc/explain/navie/thread.ts b/packages/cli/src/rpc/explain/navie/thread.ts
deleted file mode 100644
index 018b1334c..000000000
--- a/packages/cli/src/rpc/explain/navie/thread.ts
+++ /dev/null
@@ -1,122 +0,0 @@
-import { warn } from 'console';
-
-import { ExplainRpc } from '@appland/rpc';
-import configuration from '../../configuration';
-import { getLLMConfiguration } from '../../llmConfiguration';
-
-export type Message = ExplainRpc.Message;
-
-export type Question = ExplainRpc.Question;
-
-export type Answer = ExplainRpc.Answer;
-
-export class Exchange {
-  readonly question: Question;
-  answer?: Answer;
-
-  constructor(
-    timestamp: number,
-    messageId: string,
-    question: string,
-    codeSelection?: string,
-    prompt?: string
-  ) {
-    this.question = {
-      timestamp,
-      messageId,
-      content: question,
-      role: 'user',
-      codeSelection,
-      prompt,
-    };
-  }
-
-  setAnswer(messageId: string, answer: string) {
-    this.answer = {
-      messageId,
-      content: answer,
-      role: 'assistant',
-    };
-  }
-}
-
-export type ThreadData = ExplainRpc.Thread;
-
-export default class Thread implements ThreadData {
-  public readonly exchanges: Exchange[] = [];
-
-  public constructor(
-    public readonly threadId: string,
-    public readonly timestamp: number,
-    public readonly projectDirectories: string[]
-  ) {}
-
-  get messages(): Message[] {
-    const result = new Array<Message>();
-    for (const exchange of this.exchanges) {
-      result.push(exchange.question);
-      if (exchange.answer) result.push(exchange.answer);
-    }
-    return result;
-  }
-
-  /**
-   * Gets the thread timestamp formatted as 'YYYY-mm-dd'.
-   */
-  date() {
-    const date = new Date(this.timestamp);
-    return date.toISOString().split('T')[0];
-  }
-
-  question(
-    timestamp: number,
-    messageId: string,
-    question: string,
-    codeSelection?: string,
-    prompt?: string
-  ) {
-    const exchange = new Exchange(timestamp, messageId, question, codeSelection, prompt);
-    this.exchanges.push(exchange);
-  }
-
-  answer(userMessageId: string, messageId: string, answer: string) {
-    const exchange = this.exchanges[this.exchanges.length - 1];
-    if (!exchange) {
-      warn(`[history/thread] No question to answer for message ${messageId}`);
-      return;
-    }
-    if (exchange.question.messageId !== userMessageId) {
-      warn(`[history/thread] Received an answer to a different question than the last one asked`);
-      return;
-    }
-    exchange.setAnswer(messageId, answer);
-  }
-
-  asJSON(): ThreadData {
-    return {
-      timestamp: this.timestamp,
-      projectDirectories: this.projectDirectories,
-      exchanges: this.exchanges,
-    };
-  }
-
-  static fromJSON(threadId: string, data: ThreadData): Thread {
-    const thread = new Thread(threadId, data.timestamp, data.projectDirectories);
-    for (const exchange of data.exchanges) {
-      thread.question(
-        exchange.question.timestamp,
-        exchange.question.messageId,
-        exchange.question.content,
-        exchange.question.codeSelection,
-        exchange.question.prompt
-      );
-      if (exchange.answer)
-        thread.answer(
-          exchange.question.messageId,
-          exchange.answer.messageId,
-          exchange.answer.content
-        );
-    }
-    return thread;
-  }
-}
diff --git a/packages/client/src/aiClient.ts b/packages/client/src/aiClient.ts
index 60edc54ea..784994478 100644
--- a/packages/client/src/aiClient.ts
+++ b/packages/client/src/aiClient.ts
@@ -13,13 +13,13 @@ export class CodedError extends Error {
 }

 export type Callbacks = {
-  onToken: (token: string, messageId: string) => void | Promise<void>;
-  onComplete(): void | Promise<void>;
+  onToken: (token: string, messageId: string) => void;
+  onComplete(): void;
   onRequestContext?: (
     data: Record<string, unknown>
   ) => Record<string, unknown> | unknown[] | Promise<Record<string, unknown> | unknown[]>;
-  onAck?: (userMessageId: string, threadId: string) => void | Promise<void>;
-  onError?: (error: Error) => void | Promise<void>;
+  onAck?: (userMessageId: string, threadId: string) => void;
+  onError?: (error: Error) => void;
 };

 export type UserInput = {
@@ -67,13 +67,13 @@ export default class AIClient {
         if (!('userMessageId' in message))
           this.panic(new Error('Unexpected ack message: no userMessageId'));
         if (!('threadId' in message)) this.panic(new Error('Unexpected ack message: no threadId'));
-        await this.callbacks.onAck?.(message.userMessageId as string, message.threadId as string);
+        this.callbacks.onAck?.(message.userMessageId as string, message.threadId as string);
         break;
       case 'token':
         if (!('token' in message)) this.panic(new Error('Unexpected token message: no token'));
         if (!('messageId' in message))
           this.panic(new Error('Unexpected token message: no messageId'));
-        await this.callbacks.onToken(message.token as string, message.messageId as string);
+        this.callbacks.onToken(message.token as string, message.messageId as string);
         break;
       case 'request-context': {
         if (!this.callbacks.onRequestContext) {
@@ -86,7 +86,7 @@ export default class AIClient {
         break;
       }
       case 'end':
-        await this.callbacks.onComplete();
+        this.callbacks.onComplete();
         this.disconnect();
         break;
       default:
diff --git a/packages/rpc/src/explain.ts b/packages/rpc/src/explain.ts
index 3e5c624f0..ec12a18e3 100644
--- a/packages/rpc/src/explain.ts
+++ b/packages/rpc/src/explain.ts
@@ -1,10 +1,8 @@
-import { ConfigurationRpc } from './configuration';
 import { SearchRpc } from './search';

 export namespace ExplainRpc {
   export const ExplainFunctionName = 'explain';
   export const ExplainStatusFunctionName = 'explain.status';
-  export const ExplainThreadLoadFunctionName = 'explain.thread.load';

   export enum Step {
     NEW = 'new',
@@ -62,38 +60,4 @@ export namespace ExplainRpc {
     contextResponse?: ContextItem[];
     explanation?: string[];
   };
-
-  export type Message = {
-    messageId: string;
-    content: string;
-    role: 'user' | 'assistant';
-  };
-
-  export type Question = Message & {
-    role: 'user';
-    timestamp: number;
-    codeSelection?: string;
-    prompt?: string;
-  };
-
-  export type Answer = Message & {
-    role: 'assistant';
-  };
-
-  export type Exchange = {
-    question: Question;
-    answer?: Answer;
-  };
-
-  export type Thread = {
-    timestamp: number;
-    projectDirectories: string[];
-    exchanges: Exchange[];
-  };
-
-  export type LoadThreadOptions = {
-    threadId: string;
-  };
-
-  export type LoadThreadResponse = Thread;
 }

Directives

• Analyze the impact of the changes to file handling, in particular the usage of symlinks and the permissions and behavior of symlinks on Windows.
• Symlink management on Windows can fail if the user does not have admin permissions.
• Make a recommendation about how to trap and log the symlink failures
• Symlink failure should be logged once per process only.
• If the symlink errors are handled and ignored, what failure modes may be introduced?

[github-actions[bot]]

Update Navie's History Management: Handling Symlink Failures on Windows

Problem: Navie's history management encounters failures in creating symbolic links (symlinks) on Windows due to permission issues, causing the application to crash with an 'EPERM' error.

Analysis: The primary issue stems from the fact that symlinks require administrative permissions on Windows. Without these permissions, attempts to create a symlink will fail, resulting in application errors. The current implementation doesn't handle these errors gracefully, leading to application crashes.

The proposed changes aim to remove dependency on symlinks for history management in Navie. Instead, the history mechanism is refactored to use regular file operations, thus bypassing symlink creation and the associated permission issues.

Impact Analysis

1. File Handling Changes:

   • Removal of createSymlinkIfNotExists function and symlink creations.
   • Introduction of LocalHistory class to manage Navie's history using regular file operations.
   • Refactored logic to save and retrieve history messages from files without using symlinks.

2. Permissions and Behavior:

   • Windows: The removal of symlinks circumvents the need for elevated permissions/admin rights, facilitating smoother operation.
   • Non-Windows Systems: The changes should still work since basic file operations are universally supported.

3. Error Handling and Logging:

   • Errors related to file operations could still occur but will be more manageable (e.g., permission issues on file write/read can be logged and handled appropriately).
   • The refactor should include error catching and logging mechanisms to ensure any file-related issues are documented, preventing silent failures.

4. Failure Modes:

   • Ignoring symlink errors can introduce data inconsistencies if not logged adequately.
   • Failure to create symlinks previously meant a loss of reference; with the new changes, it means potential issues in reading/writing history correctly if file operations fail.
   • Consistent logging ensures any such failures are traceable, aiding in diagnosing and fixing potential issues promptly.

Proposed Changes:

1. Removal of History Initialization and Symlink Creation Logic:

   • The initializeHistory and createSymlinkIfNotExists functions are removed.
   • loadThreadHandler is eliminated along with associated symlink and history creation setup.

2. Refactored History Management:

   • Implement the LocalHistory class to save and restore conversation history without symlinks.
   • Methods in LocalHistory handle regular file reads and writes for storing messages.

3. Refactoring Navie Local and Remote Behavior:

   • navie-local.ts is modified to use the LocalHistory class for handling conversation history.
   • Similar adjustments for navie-remote.ts, ensuring consistent interfaces for local and remote operations.

4. Error Handling:

   • Introduce error wrapping into file read/write operations to ensure any issues are logged.
   • Ensure logging is performed such that it captures errors without overwhelming logs (log unique errors only once per process).

Changes Summary:

1. File: packages/cli/src/rpc/explain/navie/history.ts:

   • Delete the file containing the symlink-based history implementation.

2. File: packages/cli/src/rpc/explain/navie/historyHelper.ts:

   • Delete the file containing the helper functions for initializing symlink-based history.

3. File: packages/cli/src/rpc/explain/navie/navie-local.ts:

   • Add the LocalHistory class definition.
   • Refactor methods to use LocalHistory for saving and restoring conversations.

4. File: packages/cli/src/rpc/explain/navie/navie-remote.ts:

   • Remove symlink-related logic.
   • Ensure methods adapt to the new LocalHistory class.

5. File: packages/cli/src/cmds/index/rpc.ts:

   • Remove logic related to initializing and migrating symlink-based history.

6. File: packages/client/src/aiClient.ts:

   • Minor adjustments to method signatures to match the new interfaces.

7. Additional Logging across affected files to ensure errors are captured effectively offering insights into any failures that happened.

By refactoring to remove symlink dependencies, Navie's history management should work seamlessly across different operating systems without demanding elevated permissions. This change should also maintain overall functionality while improving reliability and error handling.