Every trap, with the date it was last checked.
Paste an error message to find the trap behind it, or filter by tool.
514 traps
- fg-0546Notion APIVerified Oct 2026Notion REST API returns 403 on a Free workspace once the block limit is reached
HTTP 403 from page or block writes in an internal or selected-workspace OAuth connection
verified 2026-10-17 · 0 confirmations
- fg-0545Anthropic APIVerified Oct 2026Turning thinking off on Claude Sonnet 5.5 fails with thinking type disabled, and computer_20251124 returns 400
400 error when sending thinking: {"type":"disabled"} to claude-sonnet-5-5
verified 2026-10-17 · 0 confirmations
- fg-0544CloudflareVerified Oct 2026Stream WebRTC live delivery starts billing on 2026-10-15 after leaving beta
Unexpected Stream charges for minutes delivered via WebRTC playback
verified 2026-10-17 · 0 confirmations
- fg-0543n8nVerified Oct 2026n8n Azure Storage node fails with custom endpoint error on a Shared Key credential set to Custom cloud
Azure Storage Shared Key credential with Azure Cloud set to Custom fails with a clear error when used
verified 2026-10-17 · 0 confirmations
- fg-0542Notion APIVerified Oct 2026Notion 429 on one connection now means 600 or 180 requests per minute depending on plan
429 rate_limited on a single integration at moderate sustained volume
verified 2026-10-17 · 0 confirmations
- fg-0541Notion APIVerified Oct 2026Notion page markdown write returns 504 gateway_timeout and the change may already be saved
HTTP 504 gateway_timeout from Update a page's content as markdown
verified 2026-10-17 · 0 confirmations
- fg-0540Notion APIVerified Oct 2026Notion page markdown edit returns 400 validation_error on a very large page and retrying never works
HTTP 400 validation_error when updating page content as markdown
verified 2026-10-17 · 0 confirmations
- fg-0539Anthropic APIVerified Oct 2026400 errors after switching from Claude Haiku 4.5 to claude-haiku-5-5 with budget_tokens, temperature, top_k, or prefill
400 invalid_request_error after changing model to claude-haiku-5-5
verified 2026-10-17 · 0 confirmations
- fg-0538Claude CodeVerified Oct 2026Large requests to api.anthropic.com are now gzip compressed even with telemetry disabled, breaking some proxies
A proxy or inspection layer in front of api.anthropic.com rejects or cannot read request bodies after upgrading
verified 2026-10-17 · 0 confirmations
- fg-0537Claude CodeVerified Oct 2026Fork subagents now on by default in claude -p, Agent SDK, desktop app and VS Code
Headless or SDK runs spawn fork subagents that did not appear before
verified 2026-10-17 · 0 confirmations
- fg-0536CloudflareVerified Oct 2026cf CLI commands stop working after update with unknown command errors for camelCase names like getCredits
cf accounts billing getCredits fails with an unknown command error
verified 2026-10-17 · 0 confirmations
- fg-0535SendGridVerified Oct 2026SendGrid 400 'All values of custom arguments object must be strings' when passing an ID or flag
400 Bad Request: All values of custom arguments object must be strings
verified 2026-10-15 · 0 confirmations
- fg-0534Model Context ProtocolVerified Oct 2026TS2589 'Type instantiation is excessively deep and possibly infinite' when registering MCP tools
TS2589: Type instantiation is excessively deep and possibly infinite
verified 2026-10-15 · 0 confirmations
- fg-0533Model Context ProtocolVerified Oct 2026Streamable HTTP MCP server answers 406 Not Acceptable to a hand-written client
Not Acceptable: Client must accept both application/json and text/event-stream
verified 2026-10-15 · 0 confirmations
- fg-0532Model Context ProtocolVerified Oct 2026stdio MCP server fails with 'Unexpected token ... is not valid JSON' because something printed to stdout
SyntaxError: Unexpected token ... is not valid JSON in the host's MCP log
verified 2026-10-15 · 0 confirmations
- fg-0531Model Context ProtocolVerified Oct 2026server.tool is not a function, or SSEServerTransport is missing, after upgrading the MCP TypeScript SDK to v2
TypeError: server.tool is not a function
verified 2026-10-15 · 0 confirmations
- fg-0530Model Context ProtocolVerified Oct 2026Python MCP server behind a proxy or custom domain rejects every request with 421 Invalid Host header
421 Misdirected Request with body Invalid Host header in the server log
verified 2026-10-15 · 0 confirmations
- fg-0529Model Context ProtocolVerified Oct 2026MCP TypeScript client gives 'MCP error -32001: Request timed out' after 60 seconds on a long tool
McpError: MCP error -32001: Request timed out
verified 2026-10-15 · 0 confirmations
- fg-0528Model Context ProtocolVerified Oct 2026MCP TypeScript client fails with SdkError ERA_NEGOTIATION_FAILED against an older server
ERA_NEGOTIATION_FAILED: Version negotiation failed: the server did not offer pinned protocol version 2026-07-28 via server/discover (no fallback in pin mode)
verified 2026-10-15 · 0 confirmations
- fg-0527Model Context ProtocolVerified Oct 2026MCP tool names with dots are valid in MCP but rejected when forwarded to the Claude API
400 invalid_request_error on a tools[].name when a custom client passes MCP tools straight to Claude
verified 2026-10-15 · 0 confirmations
- fg-0526Model Context ProtocolVerified Oct 2026MCP server returns 400 or 404 on session id after initialize when it runs on several instances
400 Bad Request on calls after a successful initialize
verified 2026-10-15 · 0 confirmations
- fg-0525Model Context ProtocolVerified Oct 2026MCP server on SDK v2 starts fine but tools/list fails because package.json still allows Zod 3
client.listTools() returns an error pointing at fromJsonSchema() while the server keeps running
verified 2026-10-15 · 0 confirmations
- fg-0524Model Context ProtocolVerified Oct 2026MCP server log messages stop reaching the client after moving to protocol 2026-07-28
notifications/message from the server no longer appear in the client
verified 2026-10-15 · 0 confirmations
- fg-0523Model Context ProtocolVerified Oct 2026MCP Registry cannot verify a Cargo crate that hides mcp-name in an HTML comment
Publishing a crates.io server fails ownership verification
verified 2026-10-15 · 0 confirmations