Add customPrompt configuration option (#95)

Author: bhouston

packages/agent/src/core/toolAgent/config.ts

@@ -136,5 +136,6 @@ export function getDefaultSystemPrompt(toolContext: ToolContext): string {
     'When you run into issues or unexpected results, take a step back and read the project documentation and configuration files and look at other source files in the project for examples of what works.',
     '',
     'Use sub-agents for parallel tasks, providing them with specific context they need rather than having them rediscover it.',
+    toolContext.customPrompt ? `\n\n${toolContext.customPrompt}` : '',
   ].join('\n');
 }

packages/agent/src/core/types.ts

@@ -17,6 +17,7 @@ export type ToolContext = {
   pageFilter: pageFilter;
   tokenTracker: TokenTracker;
   githubMode: boolean;
+  customPrompt?: string;
 };
 
 export type Tool<TParams = Record<string, any>, TReturn = any> = {

packages/agent/src/tools/interaction/subAgent.ts

@@ -99,6 +99,7 @@ export const subAgentTool: Tool<Parameters, ReturnType> = {
     const result = await toolAgent(prompt, tools, config, {
       ...context,
       workingDirectory: workingDirectory ?? context.workingDirectory,
+      customPrompt: context.customPrompt,
     });
     return { response: result.result };
   },

packages/cli/README.md

@@ -122,6 +122,7 @@ mycoder --modelProvider openai --modelName gpt-4o-2024-05-13 "Your prompt here"
 - `userSession`: Use user's existing browser session instead of sandboxed session (default: `false`)
 - `pageFilter`: Method to process webpage content: 'simple', 'none', or 'readability' (default: `none`)
 - `ollamaBaseUrl`: Base URL for Ollama API (default: `http://localhost:11434/api`)
+- `customPrompt`: Custom instructions to append to the system prompt for both main agent and sub-agents (default: `""`)
 
 Example:
 
@@ -137,6 +138,9 @@ mycoder config set pageFilter readability
 
 # Set custom Ollama server URL
 mycoder config set ollamaBaseUrl http://your-ollama-server:11434/api
+
+# Set custom instructions for the agent
+mycoder config set customPrompt "Always prioritize readability and simplicity in your code. Prefer TypeScript over JavaScript when possible."
 ```
 
 ## Environment Variables

packages/cli/src/commands/$default.ts

@@ -191,6 +191,7 @@ export const command: CommandModule<SharedOptions, DefaultArgs> = {
         workingDirectory: '.',
         tokenTracker,
         githubMode: config.githubMode,
+        customPrompt: config.customPrompt,
       });
 
       const output =

packages/cli/src/settings/config.ts

@@ -15,6 +15,7 @@ const defaultConfig = {
   modelProvider: 'anthropic',
   modelName: 'claude-3-7-sonnet-20250219',
   ollamaBaseUrl: 'http://localhost:11434/api',
+  customPrompt: '',
 };
 
 export type Config = typeof defaultConfig;