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fix(mcp): return deprecation notice as isError tool result

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isError: true is the one MCP mechanism Claude.ai cannot ignore —
it is obligated to surface tool errors to the user.

On the first tool call of a static-token session, return only the
deprecation notice with isError: true (no data). The per-session
_noticeEmitted flag is set before returning, so the immediate retry
(or any subsequent call) goes through normally and returns real data.
This commit is contained in:
jubnl
2026-04-10 03:03:37 +02:00
parent ce36b550c3
commit 89a109560e
1 changed files with 3 additions and 4 deletions
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server/src/mcp/tools/trips.ts
+3 -4
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@@ -130,10 +130,9 @@ export function registerTripTools(server: McpServer, userId: number, scopes: str
},
async ({ include_archived }) => {
const notice = getDeprecationNotice();
if (notice) return { isError: true as const, content: [{ type: 'text' as const, text: notice }] };
const trips = listTrips(userId, include_archived ? null : 0);
// Embed notice as a top-level JSON field so Claude processes it as data,
// not as a separate content annotation it can silently ignore.
return ok({ ...(notice ? { _deprecation_notice: notice } : {}), trips });
return ok({ trips });
}
);
@@ -171,8 +170,8 @@ export function registerTripTools(server: McpServer, userId: number, scopes: str
messageCount = countMessages(tripId);
}
const notice = getDeprecationNotice();
if (notice) return { isError: true as const, content: [{ type: 'text' as const, text: notice }] };
return ok({
...(notice ? { _deprecation_notice: notice } : {}),
...summary,
reservations: canReadRes ? summary.reservations : undefined,
packing: canReadPacking ? summary.packing : undefined,