Koskamo

Attest MCP

Attest MCP is a zero-code proxy and verify server that sits between MCP clients and upstream servers. It normalizes tool calls, enforces policies, gates actions for human approval, performs read-back verification against systems of record, and records tamper-evident evidence in a hash-chained ledger.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Attest MCP logo, by dev-prathapCommunity listingLocal stdioSource reviewed; not executedPublished by dev-prathap
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Popularity 1 GitHub star

What you can do with it

  • Gate MCP tool calls for human approval via web inbox or Slack
  • Verify tool execution by reading back from systems like Gmail or Linear
  • Record tamper-evident audit logs of agent actions
  • Normalize tool names and manage policy decisions

Source and maintenance

Community listingRegistry 0.1.0MIT
mcp-registry: io.github.dev-prathap/attest-proxy@0.1.0mcp-registry: io.github.dev-prathap/attest@0.1.0Source repositoryProject website
Last repository push
Latest release
v0.1.0
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

attestlayer 0.1.0

pypiuvx
attestlayer package definition
{
  "version": "0.1.0",
  "transport": "stdio",
  "identifier": "attestlayer",
  "runtimeHint": "uvx",
  "registryType": "pypi",
  "registryBaseUrl": "https://pypi.org",
  "packageArguments": [
    {
      "type": "positional",
      "value": "proxy",
      "valueHint": "proxy",
      "description": "Run the MCP proxy"
    },
    {
      "name": "--upstream",
      "type": "named",
      "valueHint": "command",
      "isRequired": true,
      "description": "Command that starts the real MCP server, e.g. \"npx -y @modelcontextprotocol/server-gmail\""
    },
    {
      "name": "--server",
      "type": "named",
      "valueHint": "system",
      "description": "System name for tools without a prefix (gmail, slack, hubspot, …)"
    },
    {
      "name": "--mode",
      "type": "named",
      "choices": [
        "block",
        "pending",
        "auto"
      ],
      "default": "block",
      "description": "block (wait for the inbox / Slack), pending (return a resume token), auto (dev)"
    }
  ],
  "environmentVariables": [
    {
      "name": "ATTEST_POLICY",
      "format": "filepath",
      "description": "Path to a policy YAML"
    },
    {
      "name": "ATTEST_LEDGER",
      "format": "filepath",
      "description": "Ledger SQLite path (default .attest/ledger.sqlite)"
    },
    {
      "name": "ATTEST_INBOX_URL",
      "description": "URL of the confirm inbox (attest serve) linked from Slack cards"
    },
    {
      "name": "SLACK_BOT_TOKEN",
      "description": "Slack bot token for confirm cards"
    },
    {
      "name": "ATTEST_SLACK_CHANNEL",
      "description": "Slack channel for confirm cards"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "attest-mcp-attestlayer": {
      "command": "uvx",
      "args": [
        "attestlayer==0.1.0",
        "proxy"
      ],
      "env": {
        "ATTEST_POLICY": "<YOUR_ATTEST_POLICY>",
        "ATTEST_LEDGER": "<YOUR_ATTEST_LEDGER>",
        "ATTEST_INBOX_URL": "<YOUR_ATTEST_INBOX_URL>",
        "SLACK_BOT_TOKEN": "<YOUR_SLACK_BOT_TOKEN>",
        "ATTEST_SLACK_CHANNEL": "<YOUR_ATTEST_SLACK_CHANNEL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "attest-mcp-attestlayer": {
      "command": "uvx",
      "args": [
        "attestlayer==0.1.0",
        "proxy"
      ],
      "env": {
        "ATTEST_POLICY": "<YOUR_ATTEST_POLICY>",
        "ATTEST_LEDGER": "<YOUR_ATTEST_LEDGER>",
        "ATTEST_INBOX_URL": "<YOUR_ATTEST_INBOX_URL>",
        "SLACK_BOT_TOKEN": "<YOUR_SLACK_BOT_TOKEN>",
        "ATTEST_SLACK_CHANNEL": "<YOUR_ATTEST_SLACK_CHANNEL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "attest-mcp-attestlayer": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "attestlayer==0.1.0",
        "proxy"
      ],
      "env": {
        "ATTEST_POLICY": "<YOUR_ATTEST_POLICY>",
        "ATTEST_LEDGER": "<YOUR_ATTEST_LEDGER>",
        "ATTEST_INBOX_URL": "<YOUR_ATTEST_INBOX_URL>",
        "SLACK_BOT_TOKEN": "<YOUR_SLACK_BOT_TOKEN>",
        "ATTEST_SLACK_CHANNEL": "<YOUR_ATTEST_SLACK_CHANNEL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "attest-mcp-attestlayer": {
      "command": "uvx",
      "args": [
        "attestlayer==0.1.0",
        "proxy"
      ],
      "env": {
        "ATTEST_POLICY": "<YOUR_ATTEST_POLICY>",
        "ATTEST_LEDGER": "<YOUR_ATTEST_LEDGER>",
        "ATTEST_INBOX_URL": "<YOUR_ATTEST_INBOX_URL>",
        "SLACK_BOT_TOKEN": "<YOUR_SLACK_BOT_TOKEN>",
        "ATTEST_SLACK_CHANNEL": "<YOUR_ATTEST_SLACK_CHANNEL>"
      }
    }
  }
}

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