com.esigndev/siglio-mcp

com.esigndev/siglio-mcpv1.0.2Email

MCP server for Siglio. Lets an AI assistant send documents for e-signature by email or text.

The current version, v1.0.2, was published to the official MCP registry on 2026-09-12. It is distributed as siglio-mcp on npm, filed under Email by this index, and declares 2 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using com.esigndev/siglio-mcp in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

NOT YET SCREENEDno verdict on file

Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-09-12).

Contracts can change after screening, with no version bump. The gate pins com.esigndev/siglio-mcp’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Environment variables

SIGLIO_API_KEY

requiredsecret

Your Siglio API key. Sandbox keys start with sig_sandbox_ and live keys start with sig_live_. Get one at https://esigndev.com

SIGLIO_ALLOW_LIVE

Set to true to allow a live key. Without it, live keys are refused and only sandbox keys will run. Leave unset while testing.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

Alternatives in Email

Mermail

app.mermail/mcp

Privacy-first email inboxes for AI agents with MCP mail tools and Composio connect/execute.

MCP Emails

com.mcpemails/emails

Never-stored live email: read, send, organize, schedule and auto-triage Gmail or any IMAP mailbox.

Evaboot

com.evaboot/evaboot

Extract LinkedIn Sales Navigator leads and find or validate their professional emails.

Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "siglio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "siglio-mcp"
      ],
      "env": {
        "SIGLIO_API_KEY": "<your-siglio_api_key>",
        "SIGLIO_ALLOW_LIVE": "<siglio_allow_live>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "siglio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "siglio-mcp"
      ],
      "env": {
        "SIGLIO_API_KEY": "<your-siglio_api_key>",
        "SIGLIO_ALLOW_LIVE": "<siglio_allow_live>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- siglio-mcp

Claude Code (claude mcp add)

claude mcp add --scope user siglio-mcp -- npx -y -- siglio-mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user siglio-mcp npx -y -- siglio-mcp

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/com-esigndev-siglio-mcp

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v1.0.2
category: Email
quality: 75 / 100
operator: com.esigndev

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Email us →

Provenance

Each verdict is bound to a hash of the exact description it judged, so a re-crawl that changes the text produces a new record rather than silently inheriting this one. Verdict history is hash-chained and anchored to Bitcoin via OpenTimestamps (latest confirmed at block 966,616). Verify it yourself.