MCP server connection issues — page 3
Issues 401–600 of the 9,294 matching this topic. The trend chart and topic overview are on page 1.
- [Bug] Advisor "unavailable" = `advisorModel: fable` + any `tool_use` in the transcript; executor-irrelevant, `opus` advisor immune (supersedes #73923's ToolSearch cause)
- MCP tool text output not displayed to user in terminal
- Channel messages don't wake idle sessions (--channels plugin)
- [BUG] Cowork: Minor version update permanently deletes chat history and scheduled tasks
- [BUG] It auto interrups when doing any task
- [Feature Request] Multi-account switching on Claude Mobile
- [FEATURE] Claude Desktop: Allow permanent auto-approval of read-only MCP tools (Read, Grep, Glob, WebSearch, WebFetch)
- [BUG] MCP server instructions from initialize response are not passed to the model
- Feature Request: Allow MCP tools to be available in subagents (Task tool)
- [BUG] Sonnet 1M context window unavailable on Max 20x subscription - regression from ~2 weeks ago
- [Bug] MCP Server Shutdown Failure on /exit Command in v1.0.63+
- [BUG] `CallToolResult.structuredContent` is ignored
- Add support for MCP `notifications/prompts/list_changed` notifications
- Publish VS Code Claude Code extension to VS Marketplace
- Notion MCP OAuth fails with "Invalid redirect_uri for OAuth client"
- [BUG] /rewind causes complete terminal lockup on any --resume'd session — Ctrl+C does not work
- [FEATURE] Implement SEP-1686 (Tasks) client support to unblock long-running MCP tool calls in Cowork / Desktop
- Connected MCP connectors not loading in new Code sessions
- I am getting the Api Error:500 repeatedly from past 10...
- MCP tool results should support the native Edit tool's diff rendering
- [FEATURE] Support disabling claude.ai MCP connectors at the project level
- [BUG] Tool output from earlier in conversation gets trimmed/truncated in terminal UI
- [BUG] mcp__ide__getDiagnostics available in CLI (integrated terminal) but missing from VSCode extension panel
- MCP OAuth: "does not support dynamic client registration" despite clientId configured
- [BUG] /reload-plugins does not load skills from newly installed marketplace plugins
- [BUG] MCP server with SSE/HTTP transport fails with OAuth discovery error — no way to disable OAuth
- [FEATURE] WebMCP support in Claude Chrome Extension
- Skills from plugins registered twice in system prompt, doubling context usage
- [BUG] "Context limit reached" triggers at 27% usage (68.9% free space) — regression in 2.1.33
- [FEATURE] Make MCP Tool Execution Timeout Configurable in Claude Desktop
- [BUG] Windows: Claude Code 2.0.65 fails with ENOENT error due to colons in MCP log directory paths
- [BUG] MCP servers from marketplace no longer available
- [BUG] vs code extension version v2.0.44 fails to initialize with "Node.js version 18 required"
- Claude Code repeatedly violates user-defined rules in CLAUDE.md despite acknowledging them
- [BUG] Claude in Chrome file_upload rejects scheduled-task sessions on Windows (same as closed #63334)
- [BUG] Claude Desktop 1.21459.0 (macOS): Extensions settings pane fails to load when any .mcpb extension is installed — TypeError: u._parse is not a function (dual zod v3/v4)
- [BUG] claude_design MCP server fails with HTTP 404 on api.anthropic.com/v1/design/mcp
- [BUG] indows 11 Pro: Cowork, Connectors, and Claude Code all broken after latest auto-update — ERR_CONNECTION_RESET + OAuthError
- [FEATURE] Lazy context loading: extend the ToolSearch pattern to all context components
- Skill tool call returns 'Tool result missing due to internal error' and agent gets stuck
- Opus 4.6 on Max plan: usage seems disproportionately high per prompt
- Feature request: compactToolOutput setting to collapse tool call details by default
- [BUG] userConfig prompt not shown during plugin install — substitution fails with "Missing required user configuration value
- [BUG] Windows: Cowork browser automation tools missing after Claude Desktop update — computer-use tools never register
- MCP notifications/claude/channel notifications not delivered to session (Telegram plugin)
- [BUG] macOS Keychain: security -i 4096-byte line buffer causes credential corruption with MCP OAuth plugins
- [BUG] MCP Streamable HTTP client does not re-initialize after server-side session invalidation
- [BUG] Plugin-defined subagents cannot access MCP tools - breaks plugin ecosystem
- Claude in Chrome extension not connecting to browser tabs - "Receiving end does not exist" error
- [BUG] Figma Desktop MCP HTTP connection fails with "No session found for sessionId
- [BUG] Omits OAuth resource parameter required by MCP 2025-06-18
- [BUG]: Denied MCP tools have their tool prompt in the context
- [BUG] Critical Bug: Claude Code Drops HTTP-Based MCP Tool Connections Mid-Session — Breaks Agent Access Despite Active Servers
- Tool Duplication in MCP SSE Server Connections Across Projects
- Streamable-HTTP MCP connector: 405 on SSE GET surfaces fatal "Client server capabilities not available" toast
- Workflow subagents don't inherit project settings.local.json permission allow-rules (prompt per tool call)
- [Bug] Fable 5 model safety measures blocking normal conversation content
- [BUG] bwrap sandbox broken on merged-usr systems (Arch): "Can't mount tmpfs on /newroot/lib64" — enableWeakerNestedSandbox does not fix it, MCP servers fail to start
- [BUG] MCP progress notifications are no longer displayed in the UI (regression)
- [BUG] [VSCode Extension] MCP Authenticate button does not open browser on macOS
- [Bug] Anthropic API Error: Safety Classifier Unavailable - Auto Mode Blocked for Tool Execution
- [BUG] CLI-only "API Error: Rate limit reached" on every request despite 97% quota remaining (Max 20x plan)
- [Feature Request] Custom MCP Server Access in Claude Code Web (Browser)
- [BUG] Slash commands not loading in version 2.0.27 - "Unknown slash command" error
- [BUG] Sometimes missing result in --output-format stream-json
- [FEATUE REQUEST] 200K is not enough. Please bring 1M token.
- Expose hooks configuration through the CLI and SDK
- Session archive is one-way: no unarchive tool and no Archived view in desktop
- [BUG] Unexpected token usage spike and continued consumption while Claude Code is inactive
- [Bug] Opus 4.8: Tool calls serialized as plain text instead of tool_use blocks in high-composition sessions
- [Bug] /compact fails with "Usage credits required for 1M context" even after /model set to Sonnet 4.6
- [BUG] Google Drive MCP connector — create_file with explicit parentId fails "User cannot add children to specified folder" — regression after May 7 incident
- [desktop] Add /reload-plugins command for in-process plugin refresh (parity with CLI)
- [BUG] Drive MCP `create_file` silently truncates binary uploads around 10K base64 chars
- [BUG] Connectors continue to appear in `claude mcp list` even after disconnected in the Claude.ai web UI
- [FEATURE] Add BEDROCK_AWS_PROFILE env variable or config flag to make Bedrock independent from current profile
- feat: MCP server push notifications (unsolicited messages to client)
- Claude in Chrome MCP server fails to connect to native host bridge socket
- Claude Code excessive limits usage in recent updates. Limits have either been reduced, or Claude Code is incorrectly counting tokens
- The /ide command cannot detect VS Code on Windows despite extension running
- Systematic Service Failures - $440 Refund Request After Month of Critical Bugs (WSL2)
- Chrome issue
- [Bug] Auto-Compact Fails Due to Conversation Length Limit
- [BUG] MCP server authorization prompt doesn't appear in VSCode integrated mode, only in terminal mode
- Docs: Discrepancy in `claude mcp add` scope storage locations
- Missing MCP Server Instructions Processing in Claude Code
- [BUG] Desktop app ignores `permissions.allow` rules — prompts for everything, even Claude's own config directory
- [BUG] [PRIVACY] GMail MCP Rewrites URL with google tracking URLS as of 5th of June
- [BUG] Blender Connector Fails to Download/Run
- Remote MCP OAuth: prompt=consent hardcoded on every authorize request breaks Entra tenants with user-consent disabled
- Opus 4.6 Max 20x: systematic hallucinations, rule violations, 80% weekly usage wasted — April 2026
- MCP OAuth dialog stuck: 'Hit Enter to continue' doesn't accept Enter key
- Telegram plugin: inbound channel notifications not delivered to session
- [BUG] Slack MCP plugin fails with invalid_scope during OAuth
- [BUG] ExitPlanMode "Yes, clear context and bypass permissions" clears plan approval state — stuck in plan mode
- [BUG] MCP server is suppressed as a duplicate of another MCP server defined in the same plugin
- [Bug] Anthropic API Error: Rate limit reached despite low session usage on Max 20x plan
- [BUG] Says totally noninforming Error "1 MCP server failed", but under /mcp all green
- [BUG] Windows: Duplicate project entries created with different drive letter capitalization (d:/ vs D:/), causing MCP servers to not load
- [FEATURE] Align tool_reference.tool_name character limit with tool.name (128 characters)
- [BUG] Plugin install fails with EINVAL: invalid argument, rename - directory moved into itself
- [BUG] Claude Code is submitting MCP requests as strings when using an SSE server
- [BUG] MCP prompt not working with title
- [BUG] MCP slash commands unrecognized when followed by a prompt
- [BUG] Task subagents fail to inherit permissions in MCP server mode (affects both WSL and native Windows)
- [BUG] Prompts coming from MCPs are ignored
- [Feature Request] Enhance JetBrains integration to allow search of ide project indexes
- Add MCP Notification-Driven Auto-Resume for Async Operations
- [BUG] Persistent ECONNRESET / "Connection lost mid-response" on all Code surfaces while raw HTTPS to api.anthropic.com is healthy (Windows 11, v2.1.229)
- [Bug] Assistant text blocks between tool calls not rendered in terminal output
- [BUG] Tool search has broken ranking, causing Claude to fail to find a tool despite exact name match
- [BUG] Enterprise-managed marketplaces in project enabledPlugins are orphaned on first run; only install after a restart
- MCP OAuth: Claude Code re-runs DCR on every authenticate, orphaning the previously-issued client_id and its refresh_token
- Unhandled case: [object Object]` banner on every turn in v2.1.141 (VS Code extension)
- [FEATURE] Stable, documented schema for ~/.claude/projects/<encoded-cwd>/<uuid>.jsonl line types
- [Bug] Claude Desktop webview hangs on session switch with concurrent MCP server operations
- Cowork Desktop: ${CLAUDE_PLUGIN_DATA} is not persistent across conversations (MCP plugin tokens lost on every new conversation)
- [BUG] Claude for Chrome MCP tools return "Navigation to this domain is not allowed" for ALL domains (v1.0.66+ regression)
- Microsoft 365 MCP connector: redirect URI mismatch (AADSTS50011)
- MCP server instructions are silently truncated when multiple servers are configured
- [BUG] Claude Code sends SIGTERM to all healthy stdio MCP servers after 10-60s — root cause analysis with strace evidence
- Context is lost when Claude suggests restarting — should auto-save a session summary before restart
- [BUG] MCP tool parameters with type: number are sent as strings to MCP servers
- [BUG] MCP ImageContent returned as text in tool results instead of native image blocks (10-20x token waste)
- [BUG] Chrome MCP screenshots accumulate in context, causing extreme token drain on session resume (17% of Max plan for 5 trivial turns)
- [FEATURE] MCP OAuth: Allow configuring redirect_uri hostname (127.0.0.1 vs localhost)
- [BUG] Atlassian MCP Server Connection Timeout (SSE)
- Chrome extension native host crashes on Windows (Bun v1.3.5 panic)
- [BUG] MCP tools fail with "Browser extension is not connected" despite /chrome showing Connected
- [BUG] `--scope user` MCP servers are not truly user-wide; project configs override without inheritance
- [Feature Request] Claude Chrome extension screenshots should support local file saving like Playwright MCP
- [Improvement] Better integration between Jupyter notebooks and CC VSCode extension
- [BUG] SSL certificate configuration don't work with web page `Fetch` (but works with MCP)
- [BUG] `claude` code version >= `1.0.36` crashes with `bun` and `bunx`
- "MCP Servers Disappearing After Repeated Account Authentication Prompts" This title captures the key technical issue: - Identifies the specific problem (missing MCP servers) - Highlights the potential trigger (repeated account authentication) - Suggests a
- [BUG] MCP Error Responses Only Display First Content Block
- [Bug] Unspecified Internal Server Error (HTTP 500)
- Cloud routines inject attribution into PR/issue comments, not controllable by attribution settings
- [BUG] Cowork macOS: all claude.ai-hosted MCP connectors fail — desktop OAuth token requested without `user:mcp_servers` scope
- CLI rendering: chat panel becomes unreadable / Unicode-mangled mid-session
- [Bug] Plan mode not enforced; tool calls continue despite plan-mode indicator
- Tool responses with both content text and structuredContent: text is hidden
- [FEATURE] Enable skill execution tracking in Cowork OTEL events
- MCP server configuration stored in ~/.claude.json is undocumented and confusing
- PostToolUse hooks: support updatedBuiltinToolOutput for built-in tools
- [FEATURE] Built-in Session Manager (claude sessions) — Consolidates 14+ Orphan/Process Issues
- [Feature Request] Auto-reconnect SSE MCP servers after server-side restart
- Cannot uninstall plugin: enabledPlugins false ignored, plugin re-installs every session
- [BUG] Bug: Teammates do NOT load skills despite documentation stating they do
- [BUG] aude in Chrome browser extension not connecting from Claude Code on Windows despite correct configuration
- [BUG] /ide integration not working for JetBrains IDE (Intellij IDEA)
- [BUG] MCP server connection fails with error -32000: Connection closed (race condition)
- [BUG] PowerPoint By Anthropic MCP Connector
- I have been asked to log in 6 times since the release of sonnet 4.5
- [BUG] SDK (TypeScript at least) fails to invoke hooks
- [BUG] Playwright MCP Server Issue on Arch Linux
- [BUG] Claude Code fails to resolve Git Bash path with space in Windows (`Program Files`)
- How to report progress with an MCP Server
- [BUG] Fix the docs. You use --header to add an authorization header, not -e
- [BUG] Built-in mcp__ide__executeCode asks for permission in VS Code pop-up for every notebook cell even if already allowed
- MCP SSE Support?
- [BUG] disableSideloadFlags breaks Claude Desktop's Local Session entirely
- Built-in Task tools (TaskCreate/TaskGet/TaskList/TaskUpdate) intermittently unregistered, and can vanish mid-session — breaks the live task display
- [BUG] v2.1.208: `/mcp` settings menu blocked in actively-attended `claude agents` sessions — "background session" guard gates on launch path, not attachment
- [BUG] Claude can't access a private personal GitHub repo despite Claude GitHub App being granted full access (backend index/sync issue)
- [Bug] jdtls-lsp spawns per-subagent instances causing >50 GB RAM exhaustion in large Java workspaces
- Long working sessions auto-archive mid-conversation; no opt-out
- VSCode extension 2.1.141: tool_reference content blocks crash renderer ("Unhandled case: [object Object]"), conversation stuck on "Thinking..."
- Cloud environments: inject "Environment variables" into the Setup script
- [FEATURE] Surface MCP tool outputSchema to the model context, not just the renderer
- [BUG] Code tab: local sessions crash immediately (exit code 1) — ccd_session/ccd_directory IPC failure
- [BUG] /mcp menu freezes and becomes unresponsive when using --resume in WSL2
- [Bug] Interactive TUI pickers freeze on input handling (regression in 2.1.115-2.1.119)
- [Bug] Anthropic API Error: Usage Policy violation on non-policy-violating prompts
- Intermittent 8-15 minute delays on simple tool calls (Write, Bash) in long sessions
- v2.1.84+: subagents lose CLAUDE.md context (omitClaudeMd:true), reduced instruction adherence with prompt caching
- Feature Request: Conversation History API for cross-client continuity (Claude App ↔ Claude Code)
- Request too large (max 20MB) after MCP screenshot - session becomes unusable
- [BUG] Heavily degraded model performance during off peak business hours (March 17, 2026)
- Feature request: reliable interrupt/notification mechanism for inter-agent messaging
- Model inserts hard line breaks in MCP tool parameters, breaking Slack/Gmail draft formatting
- [BUG] MCP tool call parameters display escaped \n and \t instead of actual line breaks
- [FEATURE] Make ToolSearch activity visible in the UI like other tool calls
- [BUG] Docker-based MCP server containers not stopped when session ends
- Custom headers from .mcp.json not forwarded on MCP tool call POST requests
- Feature Request: Allow MCP tool access for Task subagents
- Support per-MCP-server startDisabled option
- Feature Request: Support MCP Task Mode (SEP-1686) for Background Tool Execution
- Feature Request: Statusline should show total context usage (matching /context)
- [FEATURE] disable lsp
- Feature Request: Bulk enable/disable plugins
- [BUG] New update .72 throttles my cpu at 110% for longer claude code sessions on linux mint.
- [BUG] MCP headers with environment variable substitution not being sent from .mcp.json
- Feature Request: Report user-disabled MCP servers in `claude mcp list`
- [BUG] .claude.json MCP global configs = empty
- [BUG] claude doesn't wait until mcp servers are connected before initial prompt
- [BUG] Claude Desktop (Windows MSIX 1.21459.0.0): Settings > Extensions stuck on "Loading extensions..." indefinitely
- [BUG] tools/list_changed doesn't refresh the deferred-tool / ToolSearch index in interactive sessions (still repros on 2.1.165; carve-out from #4118 / #60626)
- [BUG] Multi-root workspace: agent-emitted file links unclickable outside primary folder
- False positive on Claude Code Usage Policy classifier — please stop over-flagging legitimate engineering work