io.github.sjgiewont/if-the-card-fits
io.github.sjgiewont/if-the-card-fitssjgiewontstreamable-httpv1.0.0Scanned
Which credit cards a household should carry, simulated over 5 years on weekly-verified terms.
4 tools: 1 can delete or cancel things, 2 change things and 1 only read.
- Reads private data · 0
- Reads text others write · 0
- Can send data out · 0
- No findings
Anlyon alternative
3 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.
4 tools
Deletes or cancels 1Claude Code: deny
keep_or_cancelFor cards the person already carries, says whether each one still earns its annual fee back on their spending, and what to move to if not.No findings
Why it is in this group
- The name "keep_or_cancel" says "cancel": a word for removing or ending something.
Description, as the server wrote it For cards the person already carries, says whether each one still earns its annual fee back on their spending, and what to move to if not. Pass the cards as `held`. Returns a verdict and a rounded yearly margin.
Changes things 2Claude Code: ask
simulate_cardsGiven a year of spending by category, returns the three best credit cards and the best two-card combination, with what each is worth after its annual fee over the chosen horizon.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it Given a year of spending by category, returns the three best credit cards and the best two-card combination, with what each is worth after its annual fee over the chosen horizon. Figures come from a model checked to the cent against an independent reference calculator, against card terms a person verified against the issuer's own page — the response says which catalog version and when each card was last checked. Always show the person the continueUrl: it reopens their own numbers on the site with the full breakdown, the rest of the ranking and offer alerts. Also show the disclosure string.
spending_categoriesThe 19 categories this API scores spending against.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it The 19 categories this API scores spending against. Call this first and map the person's statement onto these ids before calling simulate_cards.
Only reads 1Show 1 read-only tool
compare_twoTwo named cards head to head on the person's own spending: which one pays more, and by how much a year.No findings
Why it is in this group
- The name "compare_two" says "compare": a word for reading.
Description, as the server wrote it Two named cards head to head on the person's own spending: which one pays more, and by how much a year. Use this when they are choosing between two specific cards. For 'what should I get', use simulate_cards instead.
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 untrusted-input or outbound.
- Reads private data0
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write0
- 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.
No check matched anything in these tool definitions. That is not a safety guarantee.
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 if-the-card-fits https://ifthecardfits.com/mcpclaude mcp add --transport http if-the-card-fits https://ifthecardfits.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__if-the-card-fits__compare_two"
],
"ask": [
"mcp__if-the-card-fits__spending_categories",
"mcp__if-the-card-fits__simulate_cards"
],
"deny": [
"mcp__if-the-card-fits__keep_or_cancel"
]
}
}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 if-the-card-fits. Review it before you use it.
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/io.github.sjgiewont/if-the-card-fits/verify?hash=2aef4112142f7fec56fb46e8832c581a0df6cba62df889773c661123e14f8a54" | jq -e '.changed == false'Pinned hash 2aef4112142f, from Oct 27, 2026, 07:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.github.sjgiewont/if-the-card-fits/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/io.github.sjgiewont/if-the-card-fits)Source: MCP Registry. Synced Oct 27, 2026, 07:17 UTC.