Fielder
com.fielderusa/fielderfielderusa.comstreamable-httpv1.0.0Scanned
Find soccer fields for hourly rent in the US, check live availability and get booking links.
3 tools: 1 change things and 2 only read.
- Reads private data · 0
- Reads text others write · 1
- Can send data out · 0
- 1 finding
Anlyon alternative
1 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
3 tools
Changes things 1Claude Code: ask
get_availabilityOpen start times with prices for one field over up to 14 days, each with a booking_url.Reads text others write1 finding
Why it is in this group
- The name "get_availability" says "get": a word for reading.
- The description's first verb is "open": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe description's first sentence says "open" and "url": it reads web pages, which anyone can write.
Findings
- Warn
The server marks "get_availability" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "get_availability" says "get": a word for reading.
Description, as the server wrote it Open start times with prices for one field over up to 14 days, each with a booking_url.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
Only reads 2Show 2 read-only tools
get_fieldDetails for one field: address, surface, size, hourly prices, opening hours and operator.No findings
Why it is in this group
- The name "get_field" says "get": a word for reading.
Description, as the server wrote it Details for one field: address, surface, size, hourly prices, opening hours and operator.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
search_fieldsFind rentable fields near a location.No findings
Why it is in this group
- The name "search_fields" says "search": a word for reading.
Description, as the server wrote it Find rentable fields near a location. With a date, returns only fields with open slots that day (at start_time if given), each with a booking_url.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.
- Reads private data0
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write1
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
- Warnget_availability
The server marks "get_availability" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
What this check looks forMatched text
annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "get_availability" says "get": a word for reading.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http fielder https://api.fielderusa.com/mcpclaude mcp add --transport http fielder https://api.fielderusa.com/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__fielder__search_fields",
"mcp__fielder__get_field"
],
"ask": [
"mcp__fielder__get_availability"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as fielder. Review it before you use it.
Capability tags behind 1 rule
- mcp__fielder__get_availability untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/com.fielderusa/fielder/verify?hash=79eef0735e6948584a07db2980c5aaa298fb16910ed1a237f2ce8a25e3221554" | jq -e '.changed == false'Pinned hash 79eef0735e69, from Oct 27, 2026, 02:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/com.fielderusa/fielder/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/com.fielderusa/fielder)Source: MCP Registry. Synced Oct 27, 2026, 02:17 UTC.