Copilot's seventh pass, three comments, all the same class: the editor showing
one value while the wire carries another.
- `JSON.parse` rounds a whole number past 2^53−1 to the nearest double, so a
draft reading `{"id":9007199254740993}` submits `…992`. New
`hasRoundedInteger`, applied by all four JSON-draft parsers — the raw
arguments editor, `SchemaJsonField`, the Edit-and-replay modal, and
`parseJsonObjectDraft`, which Copilot did not flag but shares the defect.
It is narrower than "unsafe integer": it also requires the number's shortest
form to be written out in full, because JS stringifies from 1e21 upward in
exponent form and such a value was typed that way — `{"n":1e308}` is a
legitimate `_meta` value that `parseJsonObjectDraft`'s tests already pin as
accepted. It still refuses the rare full-form integer that happens to be
exactly representable, erring toward refusing a sendable value rather than
misreporting an unsendable one — the trade `toNumericValue` already makes.
- `getPrompt` runs `convertPromptArguments`, which JSON-stringifies every
non-string argument, so `{"count":2}` leaves as `{"count":"2"}` while the
editor still shows a number. `reshapedReplayParam` now rejects a non-string
prompt argument. Not a workaround: the spec types
`GetPromptRequest.params.arguments` as `Record<string, string>`, so a string
is the only thing a prompt argument can be. `tools/call` is untouched —
`callTool` sends its arguments as given.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UL9retfvAXRgvi6EWk4SY4
Signed-off-by: cliffhall <cliff@futurescale.com>
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