Skip to content

fix: ensure tool inputSchema includes type: object for discriminated unions #1675

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
MayCXC wants to merge 4 commits into from
+220 −82
Closed

fix: ensure tool inputSchema includes type: object for discriminated unions #1675

Show file tree
Hide file tree
Changes from 2 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
2cfd6f7
fix: ensure tool inputSchema includes type: "object" for non-object Z…
MayCXC Mar 12, 2026
c624fc7
add changeset
MayCXC Mar 12, 2026
b0ee18c
Merge branch 'main' into fix/discriminated-union-input-schema
MayCXC Mar 16, 2026
84fb308
fix: apply same type: object default to outputSchema, add tests
MayCXC Mar 16, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions .changeset/fix-discriminated-union-schema.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@modelcontextprotocol/server": patch
---

fix: ensure tool inputSchema includes type: object for discriminated unions
2 changes: 1 addition & 1 deletion packages/server/src/server/mcp.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,7 @@ export class McpServer {
title: tool.title,
description: tool.description,
inputSchema: tool.inputSchema
? (schemaToJson(tool.inputSchema, { io: 'input' }) as Tool['inputSchema'])
? ({ type: 'object' as const, ...schemaToJson(tool.inputSchema, { io: 'input' }) } as Tool['inputSchema'])
: EMPTY_OBJECT_JSON_SCHEMA,
annotations: tool.annotations,
execution: tool.execution,
Expand Down
Loading