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Rename _json_args to __json_args__, validate JSON input

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This commit is contained in:
Jeremiah Lowin 2026-03-23 15:48:09 -04:00
commit 106b08e654
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1 changed files with 26 additions and 4 deletions
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30
src/fastmcp/cli/apps_dev.py
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@ -1022,7 +1022,7 @@ def _build_picker_html(tools: list[dict[str, Any]]) -> str:
json_body: dict[str, Any] = {
"tool": name,
"_json_args": Rx("_json_args"),
"__json_args__": Rx("__json_args__"),
}
on_error = ShowToast(Rx("$error"), variant="error") # type: ignore[arg-type]
@ -1077,7 +1077,7 @@ def _build_picker_html(tools: list[dict[str, Any]]) -> str:
),
):
Textarea(
name="_json_args",
name="__json_args__",
placeholder='{"key": "value"}',
rows=8,
)
@ -1312,9 +1312,31 @@ def _make_dev_app(
tool = data.pop("tool", "")
# JSON mode: the entire argument dict arrives as a raw JSON string.
raw_json_args = data.pop("_json_args", None)
# Key uses a dunder prefix to avoid collisions with real tool params.
raw_json_args = data.pop("__json_args__", None)
if raw_json_args is not None:
tool_args = json.loads(raw_json_args) if raw_json_args.strip() else {}
if not raw_json_args.strip():
tool_args = {}
else:
try:
tool_args = json.loads(raw_json_args)
except json.JSONDecodeError as exc:
return Response(
content=json.dumps({"error": f"Invalid JSON: {exc}"}),
status_code=400,
media_type="application/json",
)
if not isinstance(tool_args, dict):
return Response(
content=json.dumps(
{
"error": "JSON must be an object, not "
+ type(tool_args).__name__
}
),
status_code=400,
media_type="application/json",
)
else:
# Form mode: inputs are always strings — try to parse values
# that look like JSON objects or arrays.