fixed issue for not take too much tokens

Author: Mohit-Raj-Singh

action.yml

@@ -36,6 +36,10 @@ inputs:
     description: 'Only report security issues: true | false'
     required: false
     default: 'false'
+  max_diff_chars:
+    description: 'Max diff size in characters sent to the LLM (default: 20000)'
+    required: false
+    default: '20000'
   github_token:
     description: 'GitHub token for posting comments (defaults to GITHUB_TOKEN)'
     required: false
@@ -54,3 +58,4 @@ runs:
     POST_INLINE: ${{ inputs.post_inline }}
     SECURITY_ONLY: ${{ inputs.security_only }}
     GITHUB_TOKEN: ${{ inputs.github_token }}
+    MAX_DIFF_CHARS: ${{ inputs.max_diff_chars }}

src/ai_reviewer/config.py

@@ -46,6 +46,7 @@ class Config(BaseSettings):
     post_summary: bool = True
     post_inline: bool = True
     security_only: bool = False
+    max_diff_chars: int = 20000
 
     @property
     def resolved_model(self) -> str:

src/ai_reviewer/main.py

@@ -26,6 +26,10 @@ async def run() -> None:
         print("[ai-reviewer] No diff found (all files ignored or empty PR). Skipping.")
         return
 
+    if len(diff) > config.max_diff_chars:
+        diff = diff[: config.max_diff_chars]
+        print(f"[ai-reviewer] Diff truncated to {config.max_diff_chars} chars to save tokens")
+
     print(f"[ai-reviewer] Diff size: {len(diff)} chars")
 
     # 2. Run LLM review