The route now answers 400 with a message naming the expected shape.
admin.js was taught to print `data.detail`; the Unified Integrations
form in settings.js still printed `Failed (400)` and dropped it.
That gap is exactly where the new validation bites. The client-side
JSON.parse guard added alongside it catches unparseable input, so the
only values that reach the route's 400 are ones that parse but are not
a list — `"npx"`, `{}`, `null` — and for those the status code alone
tells the user nothing about what is wrong with what they typed.
Adds source-level coverage for both forms; the PR changed two JS files
with no test on either.
`add_server` wrapped `json.loads(args)` in a bare `except` that fell back to
`[]`, so an Args value that is not JSON — a bare path, which is what the form's
placeholder invites people to type — registered the server and spawned the
stdio subprocess with an empty argv. Nothing surfaced the loss: the POST
returned 200 and the row persisted with `"args": []`.
The route now returns 400 for an unparseable value, and also for valid JSON of
the wrong shape: `args=5` reached `StdioServerParameters(args=5)` and raised an
unhandled TypeError in the error formatter's `" ".join(...)`.
Both form clients mirror the guard instead of leaving the user to read a 400
they cannot see. `settings.js` stops silently defaulting a bad Args value, and
`admin.js` gains the same client-side parse check plus a `res.ok` branch so a
server-side rejection is not reported as a connection failure.
Ported from public `dev` (`9d5c0319`, #6215 upstream, fixing #6211), with its
test. The `admin.js` hunks are inert on `lab` — `initMcpForm` early-returns
because that form's markup is not in this build — and are carried anyway to
keep the two lines from diverging further.
Léo