fix(sdk): replace deprecated base agent with codebuff/base2@latest

- Use codebuff/base2@latest for integration tests and e2e examples
- Keep base2 for unit tests that mock the database (agent string never resolves)
- Fixes "Invalid agent ID" errors in tests that hit the production API

Author: brandonkachen

sdk/e2e/examples/code-explainer.example.ts

@@ -39,7 +39,7 @@ async function main() {
   console.log('Explanation:\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Explain what this code does in simple terms:\n\n${SAMPLE_CODE}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/e2e/examples/code-reviewer.example.ts

@@ -29,7 +29,7 @@ async function main() {
   console.log('```\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Review this code and identify any bugs or issues:\n\n${SAMPLE_CODE}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/e2e/examples/commit-message-generator.example.ts

@@ -38,7 +38,7 @@ async function main() {
   console.log('Generated commit message:\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Generate a concise git commit message for this diff:\n\n${SAMPLE_DIFF}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/e2e/examples/sdk-lint.example.ts

@@ -42,7 +42,7 @@ async function main() {
   console.log('Lint results:\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Act as a linter. Find issues in this code and provide specific feedback:\n\n${CODE_TO_LINT}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/e2e/examples/sdk-refactor.example.ts

@@ -40,7 +40,7 @@ async function main() {
   console.log('Refactored version:\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Refactor this code to be more readable and use modern JavaScript features:\n\n${CODE_TO_REFACTOR}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/e2e/examples/sdk-test-gen.example.ts

@@ -39,7 +39,7 @@ async function main() {
   console.log('Generated tests:\n')
 
   const result = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: `Generate unit tests for these functions using Jest:\n\n${CODE_TO_TEST}`,
     handleStreamChunk: (chunk) => {
       if (typeof chunk === 'string') {

sdk/src/__tests__/run-handle-event.test.ts

@@ -114,7 +114,7 @@ describe('CodebuffClient handleEvent / handleStreamChunk', () => {
     })
 
     const result = await client.run({
-      agent: 'base',
+      agent: 'base2',
       prompt: 'hello world',
       handleEvent: (event) => {
         events.push(event)

sdk/src/__tests__/run-with-retry.test.ts

@@ -11,7 +11,7 @@ import type { SessionState } from '@codebuff/common/types/session-state'
 const baseOptions = {
   apiKey: 'test-key',
   fingerprintId: 'fp',
-  agent: 'base',
+  agent: 'base2',
   prompt: 'hi',
 } as const
 

sdk/src/__tests__/run.integration.test.ts

@@ -18,7 +18,7 @@ describe('Prompt Caching', () => {
       let cost1 = -1
       const run1 = await client.run({
         prompt: `${filler}\n\n${prompt}`,
-        agent: 'base',
+        agent: 'codebuff/base2@latest',
         handleEvent: (event) => {
           if (event.type === 'finish') {
             cost1 = event.totalCost
@@ -33,7 +33,7 @@ describe('Prompt Caching', () => {
       let cost2 = -1
       const run2 = await client.run({
         prompt,
-        agent: 'base',
+        agent: 'codebuff/base2@latest',
         previousRun: run1,
         handleEvent: (event) => {
           if (event.type === 'finish') {

sdk/test/test-sdk.ts

@@ -12,7 +12,7 @@ export async function testSdk() {
   })
 
   const run = await client.run({
-    agent: 'base',
+    agent: 'codebuff/base2@latest',
     prompt: 'Create a simple calculator class',
     handleEvent: (event) => {
       console.log(event)