refactor(agent-core-v2): simplify the default system prompt

.changeset/simplify-system-prompt.md

@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Simplify the built-in system prompt.

packages/agent-core-v2/src/agent/tools/os/bash/bash.md

@@ -21,6 +21,7 @@ If `run_in_background=true`, the command will be started as a background task an
 - Avoid using `..` to access files or directories outside of the working directory.
 - Avoid modifying files outside of the working directory unless explicitly instructed to do so.
 - Never run commands that require superuser privileges unless explicitly instructed to do so.
+- Run git-mutating commands such as `git commit`, `git push`, `git reset`, and `git rebase` only when the user asks for them.
 
 **Guidelines for efficiency:**
 - Use `&&` to chain commands that genuinely depend on each other, e.g. `npm install && npm test`. Independent read-only commands (separate `git show`, `ls`, or status checks) should be issued as separate parallel Bash calls in one response, not chained into a single call — chaining serializes their execution and mixes their output. Do not stitch outputs together with `echo` separators.

packages/agent-core-v2/src/app/agentProfileCatalog/profile-shared.ts

@@ -107,7 +107,7 @@ const WINDOWS_NOTES =
 export const DEFAULT_PRODUCT_NAME = 'Kimi Code CLI';
 
 export const DEFAULT_REPLY_STYLE_GUIDE =
-  "Your text replies render as Markdown in the user's terminal. Use light Markdown that reads well there: short paragraphs, `-` bullets for lists, backticks for code, commands, paths, and identifiers, and fenced blocks for multi-line code. Keep structure shallow — avoid deep nesting, large tables, and heavy headings in ordinary replies. Do not use emoji unless the user does first or asks for it. Default to prose; reach for a list only when the content is genuinely a set of items or steps. When you point to a specific code location, cite it as `path/to/file.ts:42` — a precise, consistent reference the user can navigate to.";
+  "Your text replies render as Markdown in the user's terminal. Keep structure light and shallow — deep nesting, large tables, and heavy headings read poorly there. Cite code locations as `path/to/file.ts:42` so the user can navigate to them. Do not use emoji unless the user does first or asks for it.";
 
 const ADDITIONAL_DIRS_SECTION_PROSE =
   'The following directories have been added to the workspace. You can read, write, search, and glob files in these directories as part of your workspace scope.';

packages/agent-core-v2/test/agent/fullCompaction/fullCompaction.test.ts

@@ -657,7 +657,7 @@ describe('FullCompaction', () => {
       event: 'compaction_finished',
       properties: expect.objectContaining({
         source: 'manual',
-        tokens_before: 17_863,
+        tokens_before: 17_895,
         retry_count: 1,
         trace_id: 'trace-compact-1',
       }),
@@ -1124,7 +1124,7 @@ describe('FullCompaction', () => {
       properties: expect.objectContaining({
         agent_id: 'main',
         source: 'manual',
-        tokens_before: 17_863,
+        tokens_before: 17_895,
         duration_ms: expect.any(Number),
         round: 1,
         retry_count: 0,
@@ -1349,7 +1349,7 @@ describe('FullCompaction', () => {
       event: 'compaction_failed',
       properties: expect.objectContaining({
         source: 'manual',
-        tokens_before: 17_863,
+        tokens_before: 17_895,
         duration_ms: expect.any(Number),
         retry_count: 4,
         error_type: 'APIConnectionError',