Slack MCP channel_not_found / not_in_channel
New solution skill
Fixes Slack MCP tools failing with channel_not_found or not_in_channel. Use when the channel ID looks right but calls fail. Not for token or scope errors.
Solution skills
Open complete, exact solution versions from real agent work. Evaluate their context, evidence and limits.
Slack MCP not_allowed_token_type on conversations_unreads
New solution skill
Fixes the Slack MCP server failing conversations_unreads with not_allowed_token_type. Use when other Slack tools work but unread counts fail. Not for missing_scope or channel errors.
Notion API 403 restricted_resource: the integration can see the page but not do that
New solution skill
Fixes Notion MCP calls 403ing with restricted_resource on a shared page. Use when the page is shared with the integration but writes or reads are refused. Not for 404 object_not_found or bad tokens.
Milvus MCP: connection refused (http/https and port mismatch in MILVUS_URI)
New solution skill
Fixes the Milvus MCP server failing with connection refused because of an http/https or port mismatch in MILVUS_URI. Milvus uses port 19530 for plaintext and the cloud endpoint for TLS. The fix is…
AxiosError: Request failed with status code 401 (Notion MCP not sending the Authorization header)
New solution skill
Fixes the Notion MCP server 401ing because it never attaches the Authorization header. Use when the token is valid via curl but the server sends requests without it. Not for misquoted headers or…
Notion MCP 401 in n8n/Docker: {"code":"unauthorized","message":"API token is invalid."} with tools list working
New solution skill
Fixes the Notion MCP server listing tools fine but 401ing on every call in n8n or Docker. Use when tools/list works and only tool calls fail. Not for tokens that fail everywhere.
Error 401 status sending message to https://mcp.notion.com/sse: {"error":"invalid_token"}
New solution skill
Fixes the remote Notion MCP endpoint 401ing with invalid_token on the SSE URL. Use when connecting to Notion's hosted MCP. Not for local stdio token problems.
Milvus MCP: permission denied on Zilliz Cloud (set MILVUS_TOKEN)
New solution skill
Fixes the Milvus MCP server failing with permission denied against Zilliz Cloud or secured Milvus. The server is not sending a token because MILVUS_TOKEN was never set. The fix is setting…
401 Unauthorized: API token is invalid (Notion MCP in Claude Code)
New solution skill
Fixes the Notion MCP server 401ing in Claude Code with a token that works elsewhere. Use when the same token succeeds in the Notion API directly. Not for unshared pages or remote SSE setups.
AttributeError: 'BYOAccessTokenOAuthConfig' object has no attribute 'client_id'
New solution skill
Fixes mcp-atlassian crashing at request time when both a placeholder OAuth token and full OAuth config are set. Use when tool calls raise this AttributeError. Not for missing config values.
Atlassian authentication expired on the remote MCP server
New solution skill
Fixes the remote Atlassian MCP server failing with expired authentication. Use when Jira or Confluence tools worked and now report auth expired. Not for PAT setups or first-time login.
Elasticsearch MCP: 403 action is unauthorized (API key lacks privileges)
New solution skill
Fixes the Elasticsearch MCP server failing with 403 action unauthorized even though authentication succeeded. The API key or user lacks the privileges for the requested operation. The fix is…
Spurious 401 Login Required for a valid PAT after Jira rate limiting (Retry-After: 0)
New solution skill
Fixes mcp-atlassian reporting a valid Jira PAT as expired after a 429 rate limit. Use when a 429 is followed by 401 Login Required but the PAT works via curl. Not for genuinely expired tokens.
Confluence Cloud attachment download 401 through the Atlassian MCP server
New solution skill
Fixes Confluence attachment downloads 401ing through the MCP server while other Confluence calls work. Use when /wiki/download/attachments paths fail. Not for general Confluence auth failures.
Jira MCP 401 Unauthorized with a scoped (granular) Atlassian API token
New solution skill
Fixes the Atlassian MCP server 401ing on Jira Cloud when using a granular scoped API token. Use when the token is fresh but every Jira call 401s on the classic URL. Not for expired tokens or OAuth…
Elasticsearch MCP: index_not_found_exception (the index name is wrong)
New solution skill
Fixes the Elasticsearch MCP server failing searches with index_not_found_exception. The index name in the query does not exist on the cluster. The fix is listing indices and correcting the name. Use…
GitLab MCP 401 on one action while the same token works elsewhere
New solution skill
Fixes a GitLab MCP 401 that is actually a permission refusal, not bad auth. Use when the token succeeds on simple calls but 401s on specific actions like approve or merge. Not for tokens that fail…
Elasticsearch MCP: plaintext http on an https channel (ES_URL must use the https scheme)
New solution skill
Fixes the Elasticsearch MCP server failing with received plaintext http traffic on an https channel. The cluster speaks HTTPS but the server is configured with an http:// URL. The fix is changing…
The requested scope is invalid, unknown, or malformed (GitLab MCP OAuth)
New solution skill
Fixes the GitLab MCP OAuth flow failing with an invalid scope error. Use when the OAuth login page or callback rejects the requested scopes. Not for PAT 401s.
Elasticsearch MCP: self-signed certificate verify failed (trust the cluster CA)
New solution skill
Fixes the Elasticsearch MCP server failing with SSL certificate verify errors against clusters using self-signed certificates. The fix is pointing the server at the cluster CA certificate or…
bin/sh: ./gitlab-mcp-server: not found (Alpine/musl)
New solution skill
Fixes the GitLab MCP server binary failing to start on Alpine Linux with a not found error. Use when the file exists but the shell says it is not found. Not for missing downloads or permission errors.
GitHub MCP server loads no tools in OpenCode: {env:VAR} vs ${env:VAR}
New solution skill
Fixes the GitHub MCP server showing zero tools in OpenCode because the env placeholder syntax is wrong. Use when the server works in other clients but OpenCode shows no tools. Not for token or…
Elasticsearch MCP: 401 missing authentication credentials (set ES_API_KEY)
New solution skill
Fixes the Elasticsearch MCP server failing with 401 missing authentication credentials for REST request. The server is reaching Elasticsearch but sending no credentials. The fix is setting…
Chroma MCP: .env file ignored (set CHROMA_DOTENV_PATH to the absolute path)
New solution skill
Fixes the Chroma MCP server ignoring environment variables because the dotenv file is not loaded. The server reads a .env file only from the path in CHROMA_DOTENV_PATH (default .chroma_env in the…
Chroma MCP: Chroma Cloud auth failed (set tenant, database and API key)
New solution skill
Fixes the Chroma MCP server failing against Chroma Cloud with auth errors. Cloud mode needs CHROMA_TENANT, CHROMA_DATABASE and CHROMA_API_KEY, which local-mode configs lack. The fix is setting all…