Issue Station
Sign In
Tools hereToolbox

claude-code - 💡(How to fix) Fix [BUG] Agent tool (subagent_type=Explore) returns API Error 500 on repeated calls [1 comments, 2 participants]

Official PRs (…)
ON THIS PAGE

Recommended Tools

×6

Utilities matched from this issue’s tags and category — try them while you read without losing context.

GitHub issue graph ai analysis

Paste a GitHub issue URL. We fetch that issue, discover linked issues from bodies/comments/timeline, collect linked pull requests, and produce a structured English report.

The report is written in English Markdown for sharing and archival.

Helpful · Quick feedback

Loading…
GitHub stats
anthropics/claude-code#48610•Fetched 2026-04-16 06:55:37
View on GitHub
Comments
1
Participants
2
Timeline
7
Reactions
1
Author
LeBaptouBaptisteLeBaptouBaptiste
Participants
github-actions[bot]github-actions[bot]LeBaptouBaptisteLeBaptouBaptiste
Timeline (top)
labeled ×6commented ×1

Error Message

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kJqs877KZF1WuXY8x3"}

Code Example

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server
     error"},"request_id":"req_011Ca5kJqs877KZF1WuXY8x3"}
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Environment

  • Claude Code CLI
  • Platform: win32 (Windows 11 Pro 26200)
  • Model: claude-opus-4-6[1m]

What I was doing Invoked the Agent tool with subagent_type: "Explore" and a ~3 KB prompt to run a backend security audit. Four attempts in a row with similar (but not identical) prompts both failed with API Error 500.

Expected Agent runs and returns the audit report.

Actual API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"}}

Request IDs

  • req_011Ca5jZ1t9f8BBtegkA9hYh
  • req_011Ca5jiAogDnYKphfq71n31
  • req_011Ca5jizLf445VVdHVjrNZ3
  • req_011Ca5jmg59L2YC1B4tWuLkJ

Notes

  • Previous Explore agent calls in the same session (smaller prompts) succeeded normally.
  • Both failing calls used model: opus / default model on the Explore agent.
  • Failure is immediate (no streaming), suggests a server-side rejection rather than a timeout.
  • No partial output produced.

What Should Happen?

Claude should invoke the Agent tool with subagent_type: "Explore" and a ~3 KB prompt to run a backend security audit. Four attempts

Error Messages/Logs

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server
     error"},"request_id":"req_011Ca5kJqs877KZF1WuXY8x3"}

Steps to Reproduce

Run a command

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.107

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue can likely be mitigated by reducing the prompt size or splitting it into smaller chunks to avoid triggering the server-side error.

Guidance

  • Verify that smaller prompts with the same subagent_type and model work as expected to isolate the issue to large prompt sizes.
  • Attempt to split the ~3 KB prompt into smaller parts and run them sequentially to see if the error persists.
  • Check if there are any known limitations or constraints on prompt size for the Claude Code CLI or the Anthropic API.
  • Consider reaching out to the Anthropic API support or the Claude Code community to report the issue and gather more information on potential workarounds.

Example

No specific code example can be provided without more context on the prompt structure and the exact command used to invoke the Agent tool.

Notes

The root cause of the issue is unclear, but it seems to be related to the size of the prompt. The fact that smaller prompts work normally suggests a potential server-side limitation or constraint.

Recommendation

Apply workaround: Reduce the prompt size or split it into smaller chunks to avoid triggering the server-side error, as this is the most straightforward way to mitigate the issue given the current information.

Vote matrix · Quick signals

Works
Did the solution work? Tap to confirm.
Easy Fix
Was it a quick fix?
Time Saver
Did it save you time?
Blocking
Was it severely blocking?
Common Issue
Are others likely hitting this too?
Flaky / Intermittent
Is it intermittent?
Verified / Reproducible
Can you reproduce it reliably?
Loading…
#api#generation error#database connection#vector store#embedding generation

Still need to ship something?

×6

Another batch ranked right after the header list — different links, same matching logic.

Back to top recommendations

TRENDING