{"record":{"id":"d9f617d8bff33f28","repo":"earendil-works/pi","slug":"session-file-is-not-a-valid-app-name-session","errorCode":null,"errorMessage":"Session file is not a valid ${APP_NAME} session: ${explicitPath}","messagePattern":"Session file is not a valid (.+?) session: (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/coding-agent/src/core/session-manager.ts","lineNumber":905,"sourceCode":"\t\t}\n\t}\n\n\t/** Switch to a different session file (used for resume and branching) */\n\tsetSessionFile(sessionFile: string): void {\n\t\tthis._setSessionFile(sessionFile);\n\t}\n\n\tprivate _setSessionFile(sessionFile: string, preloadedFileEntries?: FileEntry[]): void {\n\t\tthis.sessionFile = resolvePath(sessionFile);\n\t\tif (existsSync(this.sessionFile)) {\n\t\t\tthis.fileEntries = preloadedFileEntries ?? loadEntriesFromFile(this.sessionFile);\n\n\t\t\t// If file was empty, initialize it with a valid session header. If it was\n\t\t\t// non-empty but did not parse as a pi session, fail without modifying it.\n\t\t\tif (this.fileEntries.length === 0) {\n\t\t\t\tconst explicitPath = this.sessionFile;\n\t\t\t\tif (statSync(explicitPath).size > 0) {\n\t\t\t\t\tthrow new Error(`Session file is not a valid ${APP_NAME} session: ${explicitPath}`);\n\t\t\t\t}\n\t\t\t\tthis.newSession();\n\t\t\t\tthis.sessionFile = explicitPath;\n\t\t\t\tthis._rewriteFile();\n\t\t\t\tthis.flushed = true;\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst header = this.fileEntries.find((e) => e.type === \"session\") as SessionHeader | undefined;\n\t\t\tthis.sessionId = header?.id ?? createSessionId();\n\n\t\t\tif (migrateToCurrentVersion(this.fileEntries)) {\n\t\t\t\tthis._rewriteFile();\n\t\t\t}\n\n\t\t\tthis._buildIndex();\n\t\t\tthis.flushed = true;\n\t\t} else {","sourceCodeStart":887,"sourceCodeEnd":923,"githubUrl":"https://github.com/earendil-works/pi/blob/4af9d21d3b4d664e4a29fcabfec85171077248e3/packages/coding-agent/src/core/session-manager.ts#L887-L923","documentation":"Error \"Session file is not a valid ${APP_NAME} session: ${explicitPath}\" thrown in earendil-works/pi.","triggerScenarios":"Thrown at packages/coding-agent/src/core/session-manager.ts:905 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"4af9d21d3b4d664e4a29fcabfec85171077248e3","analyzedAt":"2026-08-24T13:07:14.692Z","schemaVersion":2},"datasetVersion":"2026-08-24T17:17:21.512Z"}