3 people reported

All time, since Sep 17, including 1 thumbs-up on GitHub.

Tool names exceed 64 chars

“Codex can generate model-visible MCP tool names longer than the 64-character maximum accepted by Amazon Bedrock Runtime.”

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I hit this bug: rapsheet.dev/sheets/codex/issues/16465/file
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Tool names over 64 characters rejected by model providers. Codex Apps or MCP namespaced tool names exceed the provider's 64-character limit, so requests through OpenRouter or Bedrock gateways fail with HTTP 400.

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Where
Codex Apps
Error text
`name` must be at most 64 characters, got 66
Versions
0.153.2 to 0.155.0
Platforms
macOS
How bad
Breaks a normal workflow.

Original reports2, newest first

  1. Codex Apps generate tool names >64 chars, causing Meta Muse Spark 1.3 Responses requests to fail with HTTP 400On GitHub#46358
  2. MCP tool names can exceed the Amazon Bedrock 64-character limit after #39594On GitHub#46188

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