Troubleshooting
Fixes for the most common Obsilo issues. If your problem isn't here, check the Debug tab in settings or ask in the community forum.
Model connection issues
Symptom: "Connection failed" or "API key invalid" when testing a model.
| Cause | Solution |
|---|---|
| Wrong API key | Double-check the key in Settings > Models. Regenerate it at the provider's website if unsure. |
| Expired key | Some providers expire keys after inactivity. Generate a new one. |
| Wrong base URL | For Azure and custom endpoints, verify the full URL including /v1 if required. |
| Rate limited | Wait a few minutes and try again. Consider setting a rate limit in Settings > Loop. |
| Firewall or proxy | Obsidian uses Electron's network stack. Check that your firewall allows outbound HTTPS. |
Test button
Always use the Test connection button after adding or changing a model. It verifies the key, endpoint, and model name in one step.
Semantic search not working
Symptom: semantic_search returns no results, or the agent says the index is not available.
| Cause | Solution |
|---|---|
| No embedding model configured | Go to Settings > Embeddings and set up an embedding model (e.g., OpenAI text-embedding-3-small). |
| Index not built | Click Rebuild index in Settings > Embeddings. First build can take a few minutes for large vaults. |
| Embedding API key missing | The embedding model may need its own API key. Check the embeddings settings. |
| Auto-index disabled | If auto-index is off, new or changed notes won't be indexed. Enable it or rebuild manually. |
| Vault too large | For vaults with 10,000+ notes, the initial build may take a while. Let it finish before searching. |
Agent stuck in a loop
Symptom: The agent keeps calling tools repeatedly without making progress, or hits the iteration limit.
| Cause | Solution |
|---|---|
| Weak model | Smaller or older models sometimes repeat themselves. Switch to a stronger model (Claude Sonnet, GPT-4o). |
| Consecutive error limit too high | Lower it in Settings > Loop > Consecutive error limit (default: 3). |
| Max iterations too high | Set a reasonable cap in Settings > Loop > Max iterations (default: 25). |
| Tool permission denied repeatedly | The agent asks for approval but you haven't responded. Approve or deny to let it continue. |
| Context overflow | Enable context condensing in Settings > Loop. Lower the condensing threshold if you see 400-errors. |
Emergency stop
Click the Stop button in the chat toolbar at any time to halt the agent. You can undo any changes already made via the checkpoint system.
Permission issues
Symptom: The agent says it cannot perform an action, or approvals keep appearing for routine tasks.
| Cause | Solution |
|---|---|
| Auto-approve not enabled | Go to Settings > Permissions and enable auto-approve for categories you trust. |
| File is in the ignore list | Check .obsidian-agentignore in your vault root. Remove the path if the agent should access it. |
| File is protected | Check .obsidian-agentprotected. The agent can read but not write these files. |
| Mode restricts tools | The current mode may not include the needed tool group. Switch to Agent mode or edit the mode's tools. |
MCP server not connecting
Symptom: "Failed to connect" or "Server unreachable" when adding or using an MCP server.
| Cause | Solution |
|---|---|
| Wrong transport type | Only SSE and streamable-http are supported. Stdio doesn't work in Obsidian's Electron runtime. |
| Server not running | Verify the MCP server is running and accessible at the configured URL. |
| Wrong URL | Check the server URL. Common format: http://localhost:3000/sse or http://localhost:3000/mcp. |
| CORS issues | If the MCP server runs locally, it may need CORS headers. Check the server's documentation. |
| Network timeout | Increase the connection timeout in the MCP server settings, or check your network. |
Performance problems
Symptom: Obsidian feels slow, the agent takes a long time, or the UI lags.
| Cause | Solution |
|---|---|
| Large vault indexing | The semantic index build runs in the background. Wait for it to finish. |
| Too many concurrent sub-agents | Limit subtask depth in Settings > Loop (default: 2). |
| Large context window | Enable context condensing to keep the conversation from growing too large. |
| Many MCP servers | Each connected server maintains an active connection. Remove unused servers. |
| Slow model | Local models on limited hardware can be slow. Try a smaller model or use a cloud provider. |
Memory not extracting
Symptom: The agent doesn't remember things from previous conversations.
| Cause | Solution |
|---|---|
| Memory extraction disabled | Enable it in Settings > Memory > Memory extraction. |
| Chat history disabled | Memory extraction requires saved conversations. Enable Chat history first. |
| Threshold too high | Lower the Memory threshold in settings (default: 0.7). A value of 0.5 captures more memories. |
| Wrong memory model | If the memory model isn't configured or is offline, extraction silently fails. Check Settings > Memory > Memory model. |
| Short conversations | Very brief exchanges may not contain extractable facts. This is normal. |
Common error messages
| Error | Meaning | Fix |
|---|---|---|
400: context_length_exceeded | The conversation is too long for the model's context window. | Enable context condensing. Start a new chat for fresh context. |
400: tool_use ids were found without tool_result | Anthropic / Claude-via-Copilot rejected the request because the conversation history had an orphan tool call. Usually caused by an aborted stream or a resumed crashed conversation. | v2.5.0 sanitises the history automatically on every API call, so this should no longer surface. If it does, start a new conversation. |
400: Unsupported parameter: 'max_tokens' is not supported | Old Copilot code path sending the wrong token-limit parameter. | v2.5.0 sends max_completion_tokens for every Copilot model. Update Obsilo. |
401: Unauthorized | Invalid or expired API key. | Re-enter the key in Settings > Models. |
429: Rate limit exceeded | Too many API calls in a short time. | Set a rate limit in Settings > Loop, or wait and retry. |
ECONNREFUSED | Local server (Ollama, LM Studio) isn't running. | Start the local server, then retry. |
Checkpoint failed | Could not create a file snapshot before editing. | Check disk space. Increase snapshot timeout in Settings > Vault. |
| Drawio / Diagrams plugin says "Not a diagram file" when opening a file the agent wrote | Hand-authored .drawio.svg without a valid mxfile wrapper. | Delete the broken file. Ask the agent again. v2.5.0 blocks direct write_file for .drawio.svg and routes to the built-in create_drawio tool, which writes a plugin-compatible format. |
Debug tab
The Debug tab in settings shows the agent's internal ring buffer (last 100 log entries), the generated system prompt, and connection status for each provider. Start here when something behaves unexpectedly.