diff --git a/Src/PeasyAI/src/core/services/compilation.py b/Src/PeasyAI/src/core/services/compilation.py
index 8b83c9e92..049c456cd 100644
--- a/Src/PeasyAI/src/core/services/compilation.py
+++ b/Src/PeasyAI/src/core/services/compilation.py
@@ -5,6 +5,7 @@
 This service is UI-agnostic.
 """
 
+import os
 import subprocess
 import logging
 import traceback
@@ -85,13 +86,20 @@ def compile(self, project_path: str) -> CompilationResult:
                     return_code=-1,
                 )
             
-            # Run P compiler
+            # Run P compiler. Default to collecting-mode (`P_COMPILER_COLLECT_ERRORS=1`)
+            # so a project with N independent type errors produces all N diagnostics
+            # in one compile, letting PeasyAI's fix loop converge in N/k iterations
+            # instead of N. setdefault preserves an explicit user override (set the
+            # env var to "0" or "false" in the parent shell to keep strict mode).
+            env = os.environ.copy()
+            env.setdefault("P_COMPILER_COLLECT_ERRORS", "1")
             result = subprocess.run(
                 ['p', 'compile'],
                 capture_output=True,
                 cwd=project_path,
                 text=True,
                 timeout=300,  # 5 minute timeout
+                env=env,
             )
             
             # Check for success
diff --git a/Src/PeasyAI/src/core/services/generation.py b/Src/PeasyAI/src/core/services/generation.py
index 02ddca39c..2c6a4026f 100644
--- a/Src/PeasyAI/src/core/services/generation.py
+++ b/Src/PeasyAI/src/core/services/generation.py
@@ -1442,12 +1442,17 @@ def _compile_check_candidates(
                 env = ensure_environment()
                 if env.is_valid and env.p_compiler_path:
                     import subprocess
+                    # Default to collecting-mode compilation (see
+                    # core/services/compilation.py for full rationale).
+                    subprocess_env = os.environ.copy()
+                    subprocess_env.setdefault("P_COMPILER_COLLECT_ERRORS", "1")
                     result = subprocess.run(
                         [env.p_compiler_path, "compile"],
                         cwd=project_path,
                         capture_output=True,
                         text=True,
                         timeout=30,
+                        env=subprocess_env,
                     )
                     if result.returncode == 0:
                         logger.info(f"  Candidate compiles successfully (+{COMPILE_BONUS} bonus)")
diff --git a/Src/PeasyAI/src/utils/compile_utils.py b/Src/PeasyAI/src/utils/compile_utils.py
index 0bf566316..ac7920d6b 100644
--- a/Src/PeasyAI/src/utils/compile_utils.py
+++ b/Src/PeasyAI/src/utils/compile_utils.py
@@ -36,7 +36,16 @@ def try_compile(ppath, captured_streams_output_dir):
     flags = ['-pf', ppath, "-o", str(p.parent)] if p.is_file() else []
 
     final_cmd_arr = ['p', 'compile', *flags]
-    result = subprocess.run(final_cmd_arr, capture_output=True, cwd=ppath if not p.is_file() else None)
+    # Default to collecting-mode compilation (see compilation.py for full rationale).
+    # setdefault preserves an explicit user override.
+    env = os.environ.copy()
+    env.setdefault("P_COMPILER_COLLECT_ERRORS", "1")
+    result = subprocess.run(
+        final_cmd_arr,
+        capture_output=True,
+        cwd=ppath if not p.is_file() else None,
+        env=env,
+    )
 
     out_dir = f"{captured_streams_output_dir}/compile"
     os.makedirs(out_dir, exist_ok=True)