fix: preserve existing thresholds, remove pre-read byte guard

- DEFAULT_RESULT_SIZE_CHARS: 50K -> 100K (match current _LARGE_RESULT_CHARS)
- DEFAULT_PREVIEW_SIZE_CHARS: 2K -> 1.5K (match current _LARGE_RESULT_PREVIEW_CHARS)
- Per-tool overrides all set to 100K (terminal, execute_code, search_files)
- Remove pre-read byte guard (no behavioral regression vs current main)
- Revert limit signature change to int=500 (match current default)
- Restore original read_file schema description
- Update test assertions to match 100K thresholds

tests/tools/test_tool_result_storage.py

@@ -395,7 +395,7 @@ class TestEnforceTurnBudget:
         assert PERSISTED_OUTPUT_TAG in msgs[1]["content"]
 
     def test_medium_result_regression(self):
-        """6 results of 42K chars each (252K total) — each under 50K default
+        """6 results of 42K chars each (252K total) — each under 100K default
         threshold but aggregate exceeds 200K budget. L3 should persist."""
         env = MagicMock()
         env.execute.return_value = {"output": "", "returncode": 0}
@@ -449,7 +449,7 @@ class TestPerToolThresholds:
         try:
             import tools.terminal_tool  # noqa: F401
             val = registry.get_max_result_size("terminal")
-            assert val == 30_000
+            assert val == 100_000
         except ImportError:
             pytest.skip("terminal_tool not importable in test env")
 
@@ -467,6 +467,6 @@ class TestPerToolThresholds:
         try:
             import tools.file_tools  # noqa: F401
             val = registry.get_max_result_size("search_files")
-            assert val == 20_000
+            assert val == 100_000
         except ImportError:
             pytest.skip("file_tools not importable in test env")

tools/budget_config.py

@@ -15,9 +15,9 @@ PINNED_THRESHOLDS: Dict[str, float] = {
 
 # Defaults matching the current hardcoded values in tool_result_storage.py.
 # Kept here as the single source of truth; tool_result_storage.py imports these.
-DEFAULT_RESULT_SIZE_CHARS: int = 50_000
+DEFAULT_RESULT_SIZE_CHARS: int = 100_000
 DEFAULT_TURN_BUDGET_CHARS: int = 200_000
-DEFAULT_PREVIEW_SIZE_CHARS: int = 2_000
+DEFAULT_PREVIEW_SIZE_CHARS: int = 1_500
 
 
 @dataclass(frozen=True)

tools/code_execution_tool.py

@@ -1343,5 +1343,5 @@ registry.register(
         enabled_tools=kw.get("enabled_tools")),
     check_fn=check_sandbox_requirements,
     emoji="🐍",
-    max_result_size_chars=30_000,
+    max_result_size_chars=100_000,
 )

tools/file_tools.py

@@ -26,8 +26,6 @@ _EXPECTED_WRITE_ERRNOS = {errno.EACCES, errno.EPERM, errno.EROFS}
 # Configurable via config.yaml:  file_read_max_chars: 200000
 # ---------------------------------------------------------------------------
 _DEFAULT_MAX_READ_CHARS = 100_000
-_PRE_READ_MAX_BYTES = 256_000  # reject full-file reads on files larger than this
-_DEFAULT_READ_LIMIT = 500
 _max_read_chars_cached: int | None = None
 
 
@@ -279,7 +277,7 @@ def clear_file_ops_cache(task_id: str = None):
             _file_ops_cache.clear()
 
 
-def read_file_tool(path: str, offset: int = 1, limit: int | None = None, task_id: str = "default") -> str:
+def read_file_tool(path: str, offset: int = 1, limit: int = 500, task_id: str = "default") -> str:
     """Read a file with pagination and line numbers."""
     try:
         # ── Device path guard ─────────────────────────────────────────
@@ -327,28 +325,6 @@ def read_file_tool(path: str, offset: int = 1, limit: int | None = None, task_id
             except ValueError:
                 pass
 
-        # ── Pre-read file size guard ──────────────────────────────────
-        # Guard only when the caller omits limit; an explicit limit means
-        # the caller knows what slice it wants.
-        if limit is None:
-            try:
-                _fsize = os.path.getsize(str(_resolved))
-            except OSError:
-                _fsize = 0
-            if _fsize > _PRE_READ_MAX_BYTES:
-                return json.dumps({
-                    "error": (
-                        f"File is too large to read in full ({_fsize:,} bytes). "
-                        f"Use offset and limit parameters to read specific sections "
-                        f"(e.g. offset=1, limit=100 for the first 100 lines)."
-                    ),
-                    "path": path,
-                    "file_size": _fsize,
-                }, ensure_ascii=False)
-
-        if limit is None:
-            limit = _DEFAULT_READ_LIMIT
-
         # ── Dedup check ───────────────────────────────────────────────
         # If we already read this exact (path, offset, limit) and the
         # file hasn't been modified since, return a lightweight stub
@@ -762,7 +738,7 @@ def _check_file_reqs():
 
 READ_FILE_SCHEMA = {
     "name": "read_file",
-    "description": "Read a text file with line numbers and pagination. Use this instead of cat/head/tail in terminal. Output format: 'LINE_NUM|CONTENT'. Suggests similar filenames if not found. When you already know which part of the file you need, only read that part using offset and limit — this is important for larger files. Files over 256KB will be rejected unless you provide a limit parameter. NOTE: Cannot read images or binary files — use vision_analyze for images.",
+    "description": "Read a text file with line numbers and pagination. Use this instead of cat/head/tail in terminal. Output format: 'LINE_NUM|CONTENT'. Suggests similar filenames if not found. Use offset and limit for large files. Reads exceeding ~100K characters are rejected; use offset and limit to read specific sections of large files. NOTE: Cannot read images or binary files — use vision_analyze for images.",
     "parameters": {
         "type": "object",
         "properties": {
@@ -826,7 +802,7 @@ SEARCH_FILES_SCHEMA = {
 
 def _handle_read_file(args, **kw):
     tid = kw.get("task_id") or "default"
-    return read_file_tool(path=args.get("path", ""), offset=args.get("offset", 1), limit=args.get("limit"), task_id=tid)
+    return read_file_tool(path=args.get("path", ""), offset=args.get("offset", 1), limit=args.get("limit", 500), task_id=tid)
 
 
 def _handle_write_file(args, **kw):
@@ -856,4 +832,4 @@ def _handle_search_files(args, **kw):
 registry.register(name="read_file", toolset="file", schema=READ_FILE_SCHEMA, handler=_handle_read_file, check_fn=_check_file_reqs, emoji="📖", max_result_size_chars=float('inf'))
 registry.register(name="write_file", toolset="file", schema=WRITE_FILE_SCHEMA, handler=_handle_write_file, check_fn=_check_file_reqs, emoji="✍️", max_result_size_chars=100_000)
 registry.register(name="patch", toolset="file", schema=PATCH_SCHEMA, handler=_handle_patch, check_fn=_check_file_reqs, emoji="🔧", max_result_size_chars=100_000)
-registry.register(name="search_files", toolset="file", schema=SEARCH_FILES_SCHEMA, handler=_handle_search_files, check_fn=_check_file_reqs, emoji="🔎", max_result_size_chars=20_000)
+registry.register(name="search_files", toolset="file", schema=SEARCH_FILES_SCHEMA, handler=_handle_search_files, check_fn=_check_file_reqs, emoji="🔎", max_result_size_chars=100_000)

tools/terminal_tool.py

@@ -1623,5 +1623,5 @@ registry.register(
     handler=_handle_terminal,
     check_fn=check_terminal_requirements,
     emoji="💻",
-    max_result_size_chars=30_000,
+    max_result_size_chars=100_000,
 )