added back placeholders into secret agent definition

Author: brandonkachen

.agents/factory/ask.ts

@@ -5,8 +5,10 @@ import {
   askAgentSystemPrompt,
   askAgentUserInputPrompt,
 } from '../prompts'
-import { PLACEHOLDER } from '../types/agent-definition'
-import { AgentTemplateTypes } from '../types/secret-agent-definition'
+import {
+  AgentTemplateTypes,
+  PLACEHOLDER,
+} from '../types/secret-agent-definition'
 
 import type { SecretAgentDefinition } from '../types/secret-agent-definition'
 import type { Model } from '@codebuff/common/constants'

.agents/prompts/ask-prompts.ts

@@ -3,7 +3,7 @@ import { getToolCallString } from '@codebuff/common/tools/utils'
 import { buildArray } from '@codebuff/common/util/array'
 import { closeXml } from '@codebuff/common/util/xml'
 
-import { PLACEHOLDER } from '../types/agent-definition'
+import { PLACEHOLDER } from '../types/secret-agent-definition'
 
 import type { Model } from '@codebuff/common/constants'
 

.agents/prompts/base-prompts.ts

@@ -3,7 +3,7 @@ import { getToolCallString } from '@codebuff/common/tools/utils'
 import { buildArray } from '@codebuff/common/util/array'
 import { closeXml } from '@codebuff/common/util/xml'
 
-import { PLACEHOLDER } from '../types/agent-definition'
+import { PLACEHOLDER } from '../types/secret-agent-definition'
 
 import type { Model } from '@codebuff/common/constants'
 

.agents/types/secret-agent-definition.ts

@@ -17,6 +17,36 @@ export interface SecretAgentDefinition
   toolNames?: AllToolNames[]
 }
 
+// ============================================================================
+// Placeholders (ported from backend/src/templates/types.ts)
+// ============================================================================
+
+const placeholderNames = [
+  'AGENT_NAME',
+  'AGENTS_PROMPT',
+  'CONFIG_SCHEMA',
+  'FILE_TREE_PROMPT',
+  'GIT_CHANGES_PROMPT',
+  'INITIAL_AGENT_PROMPT',
+  'KNOWLEDGE_FILES_CONTENTS',
+  'PROJECT_ROOT',
+  'REMAINING_STEPS',
+  'SYSTEM_INFO_PROMPT',
+  'TOOLS_PROMPT',
+  'USER_CWD',
+  'USER_INPUT_PROMPT',
+] as const
+
+type PlaceholderType<T extends readonly string[]> = {
+  [K in T[number]]: `{CODEBUFF_${K}}`
+}
+
+export const PLACEHOLDER = Object.fromEntries(
+  placeholderNames.map((name) => [name, `{CODEBUFF_${name}}` as const]),
+) as PlaceholderType<typeof placeholderNames>
+export type PlaceholderValue = (typeof PLACEHOLDER)[keyof typeof PLACEHOLDER]
+export const placeholderValues = Object.values(PLACEHOLDER)
+
 // ============================================================================
 // Agent Template Types (ported from common/src/types/session-state.ts)
 // ============================================================================