cancel_run — Ephemeral MCP Tool Mutating

cancel_run (cancel run) is one of 19 tools on the Ephemeral MCP server. Connect the server and your client discovers it on the handshake.

by client

How to call cancel_run from your client

Claude Code Ephemeral cancel_run run in your project directory
Claude Desktop Ephemeral cancel_run ~/Library/Application Support/Claude/claude_desktop_config.json
Cursor Ephemeral cancel_run ~/.cursor/mcp.json
VS Code Ephemeral cancel_run .vscode/mcp.json
Zed Ephemeral cancel_run ~/.config/zed/settings.json
Windsurf Ephemeral cancel_run ~/.codeium/windsurf/mcp_config.json
Cline Ephemeral cancel_run ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
Gemini CLI Ephemeral cancel_run ~/.gemini/settings.json
Grok Ephemeral cancel_run .mcp.json (in your project root)
ChatGPT Ephemeral cancel_run Settings → Connectors → Advanced → Developer mode
Claude.ai Ephemeral cancel_run Settings → Connectors → Add custom connector
LangChain Ephemeral cancel_run pip install langchain-mcp-adapters

Fastest route

claude mcp add --transport http ephemeral https://app.ephemer.al/mcp

Other tools on this server

create_run
get_run
wait_for_run
list_runs
list_workflows
get_workflow
list_models
list_connections
save_workflow
delete_workflow
list_schedules
get_schedule
create_schedule
update_schedule
delete_schedule
preview_schedule
run_schedule
list_files

This list was read from the server itself, by connecting to it and calling tools/list on 14 November 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

Ephemeral MCP server