MCP tool schema repair for reserved parameter names
Cluster 110530. Data as of
Nothing open on GitHub. Fix merged in #111479 on 15 Sep 2026. Check it covers your case.
The short answer
- Known?
- Yes. 3 related items grouped here, 1 issue already closed.
- Fix event
- A fix was merged to main in PR #111479. Check it covers your case. No release data is tracked.
- Tracker
- The maintainers' tracker marks this
resolved, deciding PR #111479. That is separate from the fix event. - Still open
- Nothing open on GitHub.
A bug where MCP tools with parameters named 'properties' or 'required' caused 400 errors, because the schema repair logic mistakenly treated the properties map itself as a schema node. Fixes address the _repair_object_shape function to handle per-entry keywords correctly.
Open issues0
Open PRs0
Fixes on record
-
#111479 fix(mcp): tools with a parameter named properties/required no longer 400 every request (#110530, salvage #110537)
files:
tests/tools/test_mcp_tool.py,tools/mcp_tool_schema.py
1 PR closed without merging
From the close comments: done elsewhere 1
-
#110537 fix(mcp): repair schema-map keywords per-entry in _repair_object_shape · done elsewhere →
798cc60,3dbaffd,#111479
Closed issues · 1
- Closed#110530MCP tool schemas 400 with `"object" is not of types "boolean", "object"` when a parameter is named `properties` (_repair_object_shape treats the properties map as a node)
How this cluster was grouped
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Link evidence (
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Pairwise link density
0.67: the share of item pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36.1.00means every pair is linked.
Pick up a Lab task
Check whether a fix covers the open issues here, with your own agent. Bring back evidence for maintainers.
Open the LabAt a glance
- Merged PRs
- #111479
- Closed issues
- 1
- Attempts
- 1 PR closed without merging
- Fix link checked
- 15 Sep 2026