[BUG] input_schema does not support oneOf, allOf, or anyOf at the top level

---

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/3383
2. https://github.com/anthropics/claude-code/issues/4753
3. https://github.com/anthropics/claude-code/issues/3940

If your issue is a duplicate, please close it and 👍 the existing issue instead.

🤖 Generated with Claude Code

---

Similar to https://github.com/anthropics/claude-code/issues/3383, the mcp-pandoc server is causing an issue, removing this line fixed the issue.

{
  "mcpServers": {
    "pandoc": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mcp-pandoc@0.5.0"
      ],
      "env": {}
    }
  }
}

It could be related to https://github.com/vivekVells/mcp-pandoc/issues/22, because I don't have pandoc installed, but it's not clear why this one specific mcp server is causing the original error message.

Also, rather than removing the whole config, I would prefer to just disable this until it gets fixed either in claude code or in mcp-pandoc. It will be easy to disable without having to remove once https://github.com/anthropics/claude-code/issues/1774 is addressed.

Have the same issue on 2.0.29:

> use cloud install command to downgrade version 2.0.28
  ⎿  API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.44.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top
     level"},"request_id":"req_011CUcu99U6muTxbcrKzWX1c"}

This issue has been inactive for 30 days. If the issue is still occurring, please comment to let us know. Otherwise, this issue will be automatically closed in 30 days for housekeeping purposes.

  ⎿ API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.38.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top
     level"},"request_id":"req_011CW2kxLh72t9zyzqUGdobX"}

 ⎿ API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.40.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top
     level"},"request_id":"req_011CW2mMxqP4X4jzJVFLr7mS"}

Experiencing this issue if you have misconfigured MCP servers (may be cause by other misconfiguration on Claude config, but mcps are common culprit).

I think Claude Code should try to self-heal when it gets this error by reviewing the project's configs. An example most likely cause is the custom config for the folder in use.

If you're blocked by this, you can try opening Claude Code in a different folder (it's likely that only the current project is bugged). if it works, you can ask it to try fix the Claude config for the failing folder, or do it yourself manually (see below).

Manually fixing;
try ~/.claude.json (global) - back it up first, if you added any mcp, you can clear it and retry running Claude Code

Find the specific project you're working on to find the mcpservers added to it.

<img width="862" height="590" alt="Image" src="https://github.com/user-attachments/assets/276d7d03-75a9-4532-b1fa-9437dc298230" />

Experiencing this issue if you have misconfigured MCP servers (may be cause by other misconfiguration on Claude config, but mcps are common culprit). I think Claude Code should try to self-heal when it gets this error by reviewing the project's configs. An example most likely cause is the custom config for the folder in use. If you're blocked by this, you can try opening Claude Code in a different folder (it's likely that only the current project is bugged). if it works, you can ask it to try fix the Claude config for the failing folder, or do it yourself manually (see below). Manually fixing; try ~/.claude.json (global) - back it up first, if you added any mcp, you can clear it and retry running Claude Code Find the specific project you're working on to find the mcpservers added to it. <img alt="Image" width="862" height="590" src="https://private-user-images.githubusercontent.com/2271973/534331608-276d7d03-75a9-4532-b1fa-9437dc298230.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.ESqAVW8hMDb2lMzeyHrI5bmK5to7nE1F8TLDz1dbCco">

Doesn't make sense, why would it only error on specific tools (38 and 40) of the 70+ in the list?

Doesn't make sense, why would it only error on specific tools (38 and 40) of the 70+ in the list?

I can only hypothesize an answer for this since I don't know about Claude Code internals.

Claude Code has ~17 tools, then if you add mcpservers they would technically be added to this list.
For example, what broke for me was my own mcp server largefile (https://github.com/peteretelej/largefile) which has 5 tools. so assuming different custom mcp tools are added onto the list then the 2 faulty "tools" could be in 1 misconfigured or non-responsive mcpserver
(in may case the mcp server was not misconfigured, but just not ready - hadn't finished installing)

This issue has been automatically closed due to 60 days of inactivity. If you're still experiencing this issue, please open a new issue with updated information.

This issue was closed incorrectly despite recent human comments. This behavior of the bot is reported at https://github.com/anthropics/claude-code/issues/16497. Please upvote that issue, so maybe it gets noticed.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.