Postbot

cz.postbot/postbotv0.1.0Other

Send real paper letters in the Czech Republic, ordinary or registered, via Česká pošta.

The current version, v0.1.0, was published to the official MCP registry on 2026-10-15. It is distributed as @postbotcz/mcp on npm and as a hosted remote over streamable-http, filed under Other by this index, and declares 9 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 Postbot 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 2026-11-16 20:47 UTC

screened 2026-10-16tier: scannedgranularity: description-levelsource: registry

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

mcpindex.integrity.descriptionpassINFO

evidence“Tool sends physical letters via Czech post.”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
- Still current: the description we screened is unchanged, re-checked against the registry

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? Test a description on the public screen → It is a separate check from the verdict above, so the two can differ.

That verdict was true at screening time (snapshot 2026-11-09).

Contracts can change after screening, with no version bump. The gate pins Postbot’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 →

Contract drift · crawler-observed · ledger

1 contract change observedmost recent Mon, 09 Nov 2026 04:00:00 GMTsafety-relevant diff

1 change with a version change.

what changednow marked destructive

injected context changedmost recent Mon, 09 Nov 2026 04:00:00 GMTsafety-relevant diff

what changedserver now injects instructions into agent context

Server-scoped, not a tool: this is text the server supplies for clients to inject into an agent’s context on connect (instructions or prompt metadata). It sits outside every tool contract hash, so this observation is its only drift signal.

Observed by mcpindex’s crawler between daily registry snapshots - a contract diff, not a safety verdict, and not an in-path prevention (that is the gate). A “safety-relevant diff” touches a safety-relevant field; it is not a confirmed vulnerability. Shown at the server level; individual tools are not named. Absence is not a clean bill of health: only public-registry servers are crawled.

Cite this record

People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.

Markdown

[Independent trust record for Postbot](https://mcpindex.ai/server/cz-postbot-postbot) - screening verdict, registry provenance, and contract drift monitoring.

HTML

<a href="https://mcpindex.ai/server/cz-postbot-postbot">Independent trust record for Postbot</a> - screening verdict, registry provenance, and contract drift monitoring.

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/cz-postbot-postbot)](https://mcpindex.ai/server/cz-postbot-postbot)

HTML

<a href="https://mcpindex.ai/server/cz-postbot-postbot"><img src="https://mcpindex.ai/api/v1/badge/cz-postbot-postbot" alt="mcpindex verdict" height="20" /></a>

Environment variables

POSTBOT_CP_USER

required

Česká pošta DopisOnline (PostServis) account username.

POSTBOT_CP_PASSWD

requiredsecret

Česká pošta DopisOnline (PostServis) account password.

POSTBOT_TEST

required

No default. "1" = Sandbox (Česká pošta test endpoint, no real letters). "0" = live, billable letters.

POSTBOT_FROM_NAME

Default sender name. If unset, letters carry no default return address.

POSTBOT_FROM_COMPANY

Default sender company (optional).

POSTBOT_FROM_STREET

Default sender street. Used only when POSTBOT_FROM_NAME is set.

POSTBOT_FROM_HOUSE

Default sender house number. Used only when POSTBOT_FROM_NAME is set.

POSTBOT_FROM_CITY

Default sender city. Used only when POSTBOT_FROM_NAME is set.

POSTBOT_FROM_ZIP

Default sender postal code (PSČ). Used only when POSTBOT_FROM_NAME is set.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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Install this server

Remote endpoint

Streamable HTTP / SSE endpoint. Add to any MCP client that supports remote servers.

https://postbot.cz/mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "postbot": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@postbotcz/mcp"
      ],
      "env": {
        "POSTBOT_CP_USER": "<postbot_cp_user>",
        "POSTBOT_CP_PASSWD": "<your-postbot_cp_passwd>",
        "POSTBOT_TEST": "<postbot_test>",
        "POSTBOT_FROM_NAME": "<postbot_from_name>",
        "POSTBOT_FROM_COMPANY": "<postbot_from_company>",
        "POSTBOT_FROM_STREET": "<postbot_from_street>",
        "POSTBOT_FROM_HOUSE": "<postbot_from_house>",
        "POSTBOT_FROM_CITY": "<postbot_from_city>",
        "POSTBOT_FROM_ZIP": "<postbot_from_zip>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "postbot": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@postbotcz/mcp"
      ],
      "env": {
        "POSTBOT_CP_USER": "<postbot_cp_user>",
        "POSTBOT_CP_PASSWD": "<your-postbot_cp_passwd>",
        "POSTBOT_TEST": "<postbot_test>",
        "POSTBOT_FROM_NAME": "<postbot_from_name>",
        "POSTBOT_FROM_COMPANY": "<postbot_from_company>",
        "POSTBOT_FROM_STREET": "<postbot_from_street>",
        "POSTBOT_FROM_HOUSE": "<postbot_from_house>",
        "POSTBOT_FROM_CITY": "<postbot_from_city>",
        "POSTBOT_FROM_ZIP": "<postbot_from_zip>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

{
  "mcpServers": {
    "postbot": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@postbotcz/mcp"
      ],
      "env": {
        "POSTBOT_CP_USER": "<postbot_cp_user>",
        "POSTBOT_CP_PASSWD": "<your-postbot_cp_passwd>",
        "POSTBOT_TEST": "<postbot_test>",
        "POSTBOT_FROM_NAME": "<postbot_from_name>",
        "POSTBOT_FROM_COMPANY": "<postbot_from_company>",
        "POSTBOT_FROM_STREET": "<postbot_from_street>",
        "POSTBOT_FROM_HOUSE": "<postbot_from_house>",
        "POSTBOT_FROM_CITY": "<postbot_from_city>",
        "POSTBOT_FROM_ZIP": "<postbot_from_zip>"
      }
    }
  }
}

Zed (~/.config/zed/settings.json)

Merge into the context_servers block of your Zed settings.

{
  "context_servers": {
    "postbot": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@postbotcz/mcp"
      ],
      "env": {
        "POSTBOT_CP_USER": "<postbot_cp_user>",
        "POSTBOT_CP_PASSWD": "<your-postbot_cp_passwd>",
        "POSTBOT_TEST": "<postbot_test>",
        "POSTBOT_FROM_NAME": "<postbot_from_name>",
        "POSTBOT_FROM_COMPANY": "<postbot_from_company>",
        "POSTBOT_FROM_STREET": "<postbot_from_street>",
        "POSTBOT_FROM_HOUSE": "<postbot_from_house>",
        "POSTBOT_FROM_CITY": "<postbot_from_city>",
        "POSTBOT_FROM_ZIP": "<postbot_from_zip>"
      }
    }
  }
}

Claude Code (claude mcp add)

claude mcp add --scope user postbot -- npx -y -- @postbotcz/mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user postbot npx -y -- @postbotcz/mcp

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/cz-postbot-postbot

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

Details

version: v0.1.0
category: Other
verdict expires: 2026-11-16
quality: 85 / 100
operator: cz.postbot

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Verify it → · or 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 975,132). Verify it yourself.

Links

Website →

Remote endpoint

https://postbot.cz/mcp