Causal concurrency fence for multi-agent tool calls — stop double-charges and duplicate side effects. Rust library + MCP server.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add effectfence -- npx -y effectfence~/.codex/config.toml
[mcp_servers.effectfence]
command = "npx"
args = ["-y", "effectfence"]
# codex mcp add effectfence -- npx -y effectfence~/.cursor/mcp.json
{
"mcpServers": {
"effectfence": {
"command": "npx",
"args": [
"-y",
"effectfence"
]
}
}
}.vscode/mcp.json
{
"servers": {
"effectfence": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"effectfence"
]
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"effectfence": {
"command": "npx",
"args": [
"-y",
"effectfence"
]
}
}
}claude_desktop_config.json
{
"mcpServers": {
"effectfence": {
"command": "npx",
"args": [
"-y",
"effectfence"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"effectfence": {
"command": "npx",
"args": [
"-y",
"effectfence"
]
}
}
}