Orca MCP Server
by jascalio.github.jascal/orca-mcp-serverv0.1.30
Go from natural language to verified finite state machines — topology bugs caught before code runs.
context tax
queued
security
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cold start
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freshness
Slowing4mo ago
Install Orca MCP server
Install in Claude Code
claude mcp add jascal -e ANTHROPIC_API_KEY='<anthropic-api-key>' -- npx -y @orcalang/orca-mcp-serverInstall in Cursor
{
"mcpServers": {
"jascal": {
"command": "npx",
"args": [
"-y",
"@orcalang/orca-mcp-server"
],
"env": {
"ANTHROPIC_API_KEY": "<anthropic-api-key>"
}
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"jascal": {
"command": "npx",
"args": [
"-y",
"@orcalang/orca-mcp-server"
],
"env": {
"ANTHROPIC_API_KEY": "<anthropic-api-key>"
}
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"jascal": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@orcalang/orca-mcp-server"
],
"env": {
"ANTHROPIC_API_KEY": "<anthropic-api-key>"
}
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"jascal": {
"command": "npx",
"args": [
"-y",
"@orcalang/orca-mcp-server"
],
"env": {
"ANTHROPIC_API_KEY": "<anthropic-api-key>"
}
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| ANTHROPIC_API_KEY | — | yes | Anthropic API key for LLM-powered tools (generate_machine, generate_multi_machine, refine_machine, generate_actions with use_llm). Not required for parse_machine, verify_machine, compile_machine, or server_status. |
| ORCA_PROVIDER | — | — | LLM provider to use: anthropic (default), openai, grok, or ollama. |
| ORCA_MODEL | — | — | Model name to use for LLM tools. Defaults to claude-sonnet-4-6 for Anthropic. |
Freshness
Slowing — last maintenance signal 4mo ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-06-03 · 4mo ago · GitHub
Latest release
2026-06-03 · 4mo ago · GitHub · v0.1.30
Package published
no data · npm/PyPI
Registry entry updated
2026-06-03 · 4mo ago · official registry · v0.1.30
FAQ
›How do I install the Orca MCP server in Claude Code?
Run: claude mcp add jascal -e ANTHROPIC_API_KEY='<anthropic-api-key>' -- npx -y @orcalang/orca-mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does Orca require an API key?
Yes. It expects ANTHROPIC_API_KEY, of which 1 is a secret.
›Can I use Orca as a remote (hosted) MCP server?
No hosted endpoint is published; it runs locally over stdio.
›Is Orca in the official MCP registry?
Yes, as io.github.jascal/orca-mcp-server.