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Allow extensions to modify system prompt in before_agent_start

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- Add systemPrompt to BeforeAgentStartEvent so extensions can see current prompt
- Change systemPromptAppend to systemPrompt in BeforeAgentStartEventResult for full replacement
- Extensions can now chain modifications (each sees the result of previous)
- Update ssh.ts to replace local cwd with remote cwd in system prompt
- Update pirate.ts, claude-rules.ts, preset.ts to use new API

fixes #575
This commit is contained in:
Mario Zechner 2026-01-08 19:54:34 +01:00
parent 0774db2e5a
commit 17cb328ca1
10 changed files with 65 additions and 27 deletions
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14
packages/coding-agent/src/core/agent-session.ts
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@ -613,7 +613,11 @@ export class AgentSession {
// Emit before_agent_start extension event
if (this._extensionRunner) {
const result = await this._extensionRunner.emitBeforeAgentStart(expandedText, options?.images);
const result = await this._extensionRunner.emitBeforeAgentStart(
expandedText,
options?.images,
this._baseSystemPrompt,
);
// Add all custom messages from extensions
if (result?.messages) {
for (const msg of result.messages) {
@ -627,11 +631,11 @@ export class AgentSession {
});
}
}
// Apply extension systemPromptAppend on top of base prompt
if (result?.systemPromptAppend) {
this.agent.setSystemPrompt(`${this._baseSystemPrompt}\n\n${result.systemPromptAppend}`);
// Apply extension-modified system prompt, or reset to base
if (result?.systemPrompt) {
this.agent.setSystemPrompt(result.systemPrompt);
} else {
// Ensure we're using the base prompt (in case previous turn had appends)
// Ensure we're using the base prompt (in case previous turn had modifications)
this.agent.setSystemPrompt(this._baseSystemPrompt);
}
}