๐ฉบ Error Catalog: When the Agent Gets Stuck Common error messages and symptoms when working with coding agents โ searchable by the exact text you see in your terminal. For each entry: what's technically behind it, how to fix it, and how to avoid it in the future. Every cause is backed by official documentation.
As of: 18.07.2026 ยท 24ร
All Limits & cost Access & keys Context Tools & MCP Security Code & tests Installation 24 matches
โธ "429 rate_limit_error" or in Claude Code "API Error: Request rejected (429) ยท this may be a temporary capacity issue." Affects: api ยท claude-code ยท alle โธ "529 overloaded_error" or "API Error: Repeated 529 Overloaded errors. The API is at capacity" Affects: api ยท claude-code โธ "401 - Incorrect API key provided" (OpenAI) or in Claude Code "Invalid API key ยท Fix external API key" or "This organization has been disabled" Affects: api ยท claude-code ยท alle โธ "Prompt is too long" โ the model's context window is full Affects: claude-code ยท api โธ "Autocompact is thrashing: the context refilled to the limit..." Affects: claude-code โธ "Model gpt-3.5-turbo has hit a token limit! ... Output tokens: 4096 of 4096 -- exceeded output limit!" Affects: aider โธ "Failed to apply edit to <filename>" โ Aider repeats the same failed edit attempt Affects: aider โธ "API Error: 400 due to tool use concurrency issues. Run /rewind to recover the conversation." or "unexpected tool_use_id found in tool_result blocks" Affects: claude-code ยท api โธ MCP server stays 'failed' in Claude Code, or "spawn claude ENOENT" / MCP server has "url" but no "type" Affects: claude-code โธ Unexpectedly high bill or token usage despite seemingly normal usage Affects: claude-code ยท api โธ Agent deletes or overwrites a file via Bash (rm/mv/cp), and /rewind doesn't bring it back Affects: claude-code โธ "CONFLICT (content): Merge conflict in <file>" / "Automatic merge failed; fix conflicts and then commit the result." Affects: alle โธ "There's an issue with the selected model (claude-...). It may not exist or you may not have access to it." or "Model ... is not a recognized model id." Affects: claude-code ยท api โธ Request with a high thinking budget hangs or times out, or "max_tokens must be greater than thinking.budget_tokens" Affects: api ยท claude-code โธ "Claude Code on Windows requires either Git for Windows (for bash) or PowerShell" Affects: claude-code โธ "aider: The term 'aider' is not recognized as a name of a cmdlet, function, script file, or executable program." Affects: aider โธ "Could not find native binary package @anthropic-ai/claude-code-<platform>" Affects: claude-code โธ JSON response cuts off mid-object, or JSONDecodeError when parsing the structured output Affects: api ยท alle โธ Agent imports or installs a package that doesn't exist at all (e.g. npm install <fantasy-name> or an import that leads to ModuleNotFoundError) Affects: alle โธ Codex CLI denies internet access, or a command fails in sandbox mode even though it works locally without Codex Affects: codex-cli โธ Antigravity CLI agent aborts an action with an ask prompt or deny, even though a matching allow rule appears to be configured Affects: antigravity-cli โธ Agent reports that a .env or config file can't be found, even though it clearly exists in the main directory Affects: claude-code โธ "No conversation found with session ID: <session-id>" when trying to resume a session Affects: claude-code โธ Claude warns about a suspected prompt injection or refuses a request after external content (webpage, file, MCP tool result) was loaded into the conversation Affects: claude-code ยท alle