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"node_modules/typescript": { "version": "5.9.3", "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz", From 4a67b807a8c71465b0f6c2e31f01da1f682c211d Mon Sep 17 00:00:00 2001 From: "Priyanshu-Priyam..." <@Priyanshu2008> Date: Fri, 6 Mar 2026 22:10:38 +0530 Subject: [PATCH 2/2] Surface LLM errors in CLI, use pi-ai credential detection, and implement model fallback Three related fixes for silent model failures: 1. CLI now prints LLM-level errors (stopReason: "error") instead of showing a blank line. Fires on_error hooks and audit logging for these failures. 2. Replace hardcoded 6-provider API key map with pi-ai's getEnvApiKey(), which supports all providers including Bedrock, Vertex, Azure, etc. 3. Implement model fallback: when the preferred model fails, automatically retry with models from agent.yaml's model.fallback list. Works in both CLI (REPL + single-shot) and SDK (query()) paths. Made-with: Cursor --- src/index.ts | 67 +++++++++++++++++++++++++++++++++++++----------- src/loader.ts | 18 +++++++++++++ src/sdk-types.ts | 2 +- src/sdk.ts | 26 +++++++++++++++++-- 4 files changed, 95 insertions(+), 18 deletions(-) diff --git a/src/index.ts b/src/index.ts index cd97c77..023d271 100644 --- a/src/index.ts +++ b/src/index.ts @@ -4,6 +4,7 @@ import { createInterface } from "readline"; import { Agent } from "@mariozechner/pi-agent-core"; import type { AgentEvent, AgentTool } from "@mariozechner/pi-agent-core"; import { loadAgent } from "./loader.js"; +import { getEnvApiKey } from "@mariozechner/pi-ai"; import { createBuiltinTools } from "./tools/index.js"; import { createSandboxContext } from "./sandbox.js"; import type { SandboxContext, SandboxConfig } from "./sandbox.js"; @@ -123,7 +124,21 @@ function handleEvent( break; } case "message_end": { - process.stdout.write("\n"); + const msg = event.message as any; + if (msg?.role === "assistant" && msg.stopReason === "error") { + const errorText = msg.errorMessage || "LLM request failed (unknown error)"; + process.stdout.write(red(`\nError: ${errorText}`) + "\n"); + auditLogger?.logError(errorText).catch(() => {}); + if (hooksConfig?.hooks.on_error) { + runHooks(hooksConfig.hooks.on_error, agentDir, { + event: "on_error", + session_id: sessionId, + error: errorText, + }).catch(() => {}); + } + } else { + process.stdout.write("\n"); + } // Fire post_response hooks (non-blocking) if (hooksConfig?.hooks.post_response) { runHooks(hooksConfig.hooks.post_response, agentDir, { @@ -416,21 +431,14 @@ async function main(): Promise { } } - // Map provider to expected env var - const apiKeyEnvVars: Record = { - anthropic: "ANTHROPIC_API_KEY", - openai: "OPENAI_API_KEY", - google: "GOOGLE_API_KEY", - xai: "XAI_API_KEY", - groq: "GROQ_API_KEY", - mistral: "MISTRAL_API_KEY", - }; - + // Validate API credentials using pi-ai's provider-aware detection. + // Supports all providers: OpenAI, Anthropic, Bedrock, Vertex, Groq, etc. const provider = loaded.model.provider; - const envVar = apiKeyEnvVars[provider]; - if (envVar && !process.env[envVar]) { - console.error(red(`Error: ${envVar} environment variable is not set.`)); - console.error(dim(`Set it with: export ${envVar}=your-key-here`)); + const apiKey = getEnvApiKey(provider); + if (!apiKey) { + console.error(red(`Error: No API credentials found for provider "${provider}".`)); + console.error(dim(`Set the appropriate environment variable for your provider.`)); + console.error(dim(`Examples: OPENAI_API_KEY, ANTHROPIC_API_KEY, AWS_PROFILE, etc.`)); process.exit(1); } @@ -472,8 +480,29 @@ async function main(): Promise { agent.subscribe((event) => handleEvent(event, hooksConfig, agentDir, sessionId, auditLogger)); + // Track remaining fallback models for automatic retry + const remainingFallbacks = [...loaded.fallbackModels]; + + /** + * Try falling back to the next model if the current one returned an error. + * Returns true if a fallback was activated (caller should retry the prompt). + */ + function tryFallback(): boolean { + if (!agent.state.error || remainingFallbacks.length === 0) { + return false; + } + const next = remainingFallbacks.shift()!; + console.log(dim(`Model failed, falling back to ${next.provider}:${next.id}...`)); + agent.setModel(next); + agent.reset(); + return true; + } + console.log(bold(`${manifest.name} v${manifest.version}`)); console.log(dim(`Model: ${loaded.model.provider}:${loaded.model.id}`)); + if (remainingFallbacks.length > 0) { + console.log(dim(`Fallbacks: ${remainingFallbacks.map((m) => `${m.provider}:${m.id}`).join(", ")}`)); + } const allToolNames = tools.map((t) => t.name); console.log(dim(`Tools: ${allToolNames.join(", ")}`)); if (skills.length > 0) { @@ -491,6 +520,10 @@ async function main(): Promise { if (prompt) { try { await agent.prompt(prompt); + // Retry with fallback models on LLM-level error + while (tryFallback()) { + await agent.prompt(prompt); + } } catch (err: any) { auditLogger?.logError(err.message).catch(() => {}); // Fire on_error hooks @@ -582,6 +615,10 @@ async function main(): Promise { try { await agent.prompt(promptText); + // Retry with fallback models on LLM-level error + while (tryFallback()) { + await agent.prompt(promptText); + } } catch (err: any) { console.error(red(`Error: ${err.message}`)); auditLogger?.logError(err.message).catch(() => {}); diff --git a/src/loader.ts b/src/loader.ts index 151b70a..568383d 100644 --- a/src/loader.ts +++ b/src/loader.ts @@ -106,6 +106,7 @@ export interface LoadedAgent { systemPrompt: string; manifest: AgentManifest; model: Model; + fallbackModels: Model[]; skills: SkillMetadata[]; knowledge: LoadedKnowledge; workflows: WorkflowMetadata[]; @@ -306,10 +307,27 @@ export async function loadAgent( const { provider, modelId } = parseModelString(modelStr); const model = getModel(provider as any, modelId as any); + // Parse fallback models (skip any that don't resolve) + const fallbackModels: Model[] = []; + if (manifest.model.fallback?.length) { + for (const fb of manifest.model.fallback) { + try { + const { provider: fbProvider, modelId: fbModelId } = parseModelString(fb); + const fbModel = getModel(fbProvider as any, fbModelId as any); + if (fbModel) { + fallbackModels.push(fbModel); + } + } catch { + // Skip unparseable fallback entries + } + } + } + return { systemPrompt, manifest, model, + fallbackModels, skills, knowledge, workflows, diff --git a/src/sdk-types.ts b/src/sdk-types.ts index d9d0fae..29f9b94 100644 --- a/src/sdk-types.ts +++ b/src/sdk-types.ts @@ -51,7 +51,7 @@ export interface GCToolResultMessage { export interface GCSystemMessage { type: "system"; subtype: "session_start" | "session_end" | "hook_blocked" - | "compliance_warning" | "error"; + | "compliance_warning" | "error" | "fallback"; content: string; metadata?: Record; } diff --git a/src/sdk.ts b/src/sdk.ts index 0e51f50..f5ecda4 100644 --- a/src/sdk.ts +++ b/src/sdk.ts @@ -410,14 +410,36 @@ export function query(options: QueryOptions): Query { } }); - // 10. Send prompt + // 10. Send prompt (with fallback retry on LLM-level errors) + const remainingFallbacks = [...loaded.fallbackModels]; + function tryFallback(): boolean { + if (!agent.state.error || remainingFallbacks.length === 0) { + return false; + } + const next = remainingFallbacks.shift()!; + pushMsg({ + type: "system", + subtype: "fallback", + content: `Model failed, falling back to ${next.provider}:${next.id}`, + metadata: { model: next.id, provider: next.provider }, + }); + agent.setModel(next); + agent.reset(); + return true; + } + if (typeof options.prompt === "string") { await agent.prompt(options.prompt); + while (tryFallback()) { + await agent.prompt(options.prompt); + } } else { - // Multi-turn: iterate the async iterable for await (const userMsg of options.prompt) { pushMsg({ type: "user", content: userMsg.content }); await agent.prompt(userMsg.content); + while (tryFallback()) { + await agent.prompt(userMsg.content); + } } }