io.github.coopergwrenn/postals-mcp

io.github.coopergwrenn/postals-mcpv1.0.0Other

Send physical handwritten postcards from any AI agent. Real pen & ink, USPS, $4.99/card.

In-path gate · all MCP tools

Using io.github.coopergwrenn/postals-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

REVIEWstatus: PARTIALfresh until 2026-08-04 01:02 UTC

screened 2026-07-05tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“No malicious instructions found”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-07-31).

Contracts can change after screening, with no version bump. The gate pins io.github.coopergwrenn/postals-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 →

Embed this badge

A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-coopergwrenn-postals-mcp)](https://mcpindex.ai/server/io-github-coopergwrenn-postals-mcp)

HTML

<a href="https://mcpindex.ai/server/io-github-coopergwrenn-postals-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-coopergwrenn-postals-mcp" alt="mcpindex verdict" height="20" /></a>

Environment variables

POSTALS_API_KEY

requiredsecret

Your Handwrytten API key (v1.0) or Postals API key (v1.1+).

POSTALS_SENDER_NAME

Default sender full name for return address.

POSTALS_SENDER_ADDRESS

Default sender street address.

POSTALS_SENDER_CITY

Default sender city.

POSTALS_SENDER_STATE

Default sender 2-letter US state code.

POSTALS_SENDER_ZIP

Default sender 5-digit ZIP (or 5+4 format).

POSTALS_DEFAULT_CARD_IMAGE

Default card front image URL (HTTPS, PNG or JPEG, landscape 7x5 preferred).

POSTALS_HANDWRITING_STYLE

Default handwriting font. Default: Joyful Jennifer.

POSTALS_DAILY_LIMIT

Max cards per day (safety net). Default: 50.

POSTALS_TEST_MODE

Set to 'true' for test mode (validates inputs, no cards actually sent).

CLOUDFLARE_ACCOUNT_ID

Optional. Enables AI message generation via Cloudflare Workers AI.

CLOUDFLARE_API_TOKEN

secret

Optional. Required together with CLOUDFLARE_ACCOUNT_ID for AI message generation.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "postals-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "postals-mcp"
      ],
      "env": {
        "POSTALS_API_KEY": "<your-postals_api_key>",
        "POSTALS_SENDER_NAME": "<postals_sender_name>",
        "POSTALS_SENDER_ADDRESS": "<postals_sender_address>",
        "POSTALS_SENDER_CITY": "<postals_sender_city>",
        "POSTALS_SENDER_STATE": "<postals_sender_state>",
        "POSTALS_SENDER_ZIP": "<postals_sender_zip>",
        "POSTALS_DEFAULT_CARD_IMAGE": "<postals_default_card_image>",
        "POSTALS_HANDWRITING_STYLE": "<postals_handwriting_style>",
        "POSTALS_DAILY_LIMIT": "<postals_daily_limit>",
        "POSTALS_TEST_MODE": "<postals_test_mode>",
        "CLOUDFLARE_ACCOUNT_ID": "<cloudflare_account_id>",
        "CLOUDFLARE_API_TOKEN": "<your-cloudflare_api_token>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "postals-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "postals-mcp"
      ],
      "env": {
        "POSTALS_API_KEY": "<your-postals_api_key>",
        "POSTALS_SENDER_NAME": "<postals_sender_name>",
        "POSTALS_SENDER_ADDRESS": "<postals_sender_address>",
        "POSTALS_SENDER_CITY": "<postals_sender_city>",
        "POSTALS_SENDER_STATE": "<postals_sender_state>",
        "POSTALS_SENDER_ZIP": "<postals_sender_zip>",
        "POSTALS_DEFAULT_CARD_IMAGE": "<postals_default_card_image>",
        "POSTALS_HANDWRITING_STYLE": "<postals_handwriting_style>",
        "POSTALS_DAILY_LIMIT": "<postals_daily_limit>",
        "POSTALS_TEST_MODE": "<postals_test_mode>",
        "CLOUDFLARE_ACCOUNT_ID": "<cloudflare_account_id>",
        "CLOUDFLARE_API_TOKEN": "<your-cloudflare_api_token>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- postals-mcp

Claude Code (claude mcp add)

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

Gemini CLI (gemini mcp add)

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

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-coopergwrenn-postals-mcp

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

Details

version: v1.0.0
category: Other
verdict expires: 2026-08-04
quality: 79 / 100
operator: coopergwrenn

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 960,209). Verify it yourself.

Links

Repository →