Zero-code proxy: policy, human gate, read-back and a hash-chained ledger for any MCP server.
Connect Runs on your machine
claude mcp add attest-proxy -e ATTEST_POLICY=<ATTEST_POLICY> -e ATTEST_LEDGER=<ATTEST_LEDGER> -e ATTEST_INBOX_URL=<ATTEST_INBOX_URL> -e SLACK_BOT_TOKEN=<SLACK_BOT_TOKEN> -e ATTEST_SLACK_CHANNEL=<ATTEST_SLACK_CHANNEL> -- uvx attestlayer==0.1.0{
"mcpServers": {
"attest-proxy": {
"command": "uvx",
"args": [
"attestlayer==0.1.0"
],
"env": {
"ATTEST_POLICY": "<ATTEST_POLICY>",
"ATTEST_LEDGER": "<ATTEST_LEDGER>",
"ATTEST_INBOX_URL": "<ATTEST_INBOX_URL>",
"SLACK_BOT_TOKEN": "<SLACK_BOT_TOKEN>",
"ATTEST_SLACK_CHANNEL": "<ATTEST_SLACK_CHANNEL>"
}
}
}
}{
"mcpServers": {
"attest-proxy": {
"command": "uvx",
"args": [
"attestlayer==0.1.0"
],
"env": {
"ATTEST_POLICY": "<ATTEST_POLICY>",
"ATTEST_LEDGER": "<ATTEST_LEDGER>",
"ATTEST_INBOX_URL": "<ATTEST_INBOX_URL>",
"SLACK_BOT_TOKEN": "<SLACK_BOT_TOKEN>",
"ATTEST_SLACK_CHANNEL": "<ATTEST_SLACK_CHANNEL>"
}
}
}
}{
"servers": {
"attest-proxy": {
"type": "stdio",
"command": "uvx",
"args": [
"attestlayer==0.1.0"
],
"env": {
"ATTEST_POLICY": "<ATTEST_POLICY>",
"ATTEST_LEDGER": "<ATTEST_LEDGER>",
"ATTEST_INBOX_URL": "<ATTEST_INBOX_URL>",
"SLACK_BOT_TOKEN": "<SLACK_BOT_TOKEN>",
"ATTEST_SLACK_CHANNEL": "<ATTEST_SLACK_CHANNEL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
ATTEST_POLICYOptional | Path to a policy YAML |
ATTEST_LEDGEROptional | Ledger SQLite path (default .attest/ledger.sqlite) |
ATTEST_INBOX_URLOptional | URL of the confirm inbox (attest serve) linked from Slack cards |
SLACK_BOT_TOKENOptional, secret | Slack bot token for confirm cards |
ATTEST_SLACK_CHANNELOptional | Slack channel for confirm cards |
Details
| Package | [email protected] (PYPI, stdio) |
| First published | 19 Sep 2026 |
| Last updated | 19 Sep 2026 |
| Registry name | io.github.dev-prathap/attest-proxy |
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