Coin Flip Skill
The tool
Coin Flipper provides realistic coin tossing simulation with support for multiple flips, detailed statistics including longest streaks, win percentages, and fairness indicators for random outcomes.
Once your client is connected to the VerveKit MCP server, this appears in its tool list as CoinFlipSkill. It is read-only and open-world: it fetches, it never mutates anything on your side, so most clients will call it without asking you to confirm.
{
"name": "CoinFlipSkill",
"arguments": {}
}Connecting
One server URL covers every skill in the catalog, including this one. Authorization is OAuth — the client opens a browser once and there is no key to paste into a config file.
{
"mcpServers": {
"vervekit": {
"url": "https://api.vervekit.com/v1/mcp"
}
}
}https://api.vervekit.com/v1/mcpPer-client setup — Claude Desktop, Cursor, VS Code, ChatGPT — is on the MCP setup page.
Arguments
These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made.
| Argument | Type | Example | Description |
|---|---|---|---|
flipsPremium | integer | 10 | Number of coins to flip |
What the model gets back
The result carries a structuredContent object matching the tool's declared outputSchema, so a client can read fields without parsing prose. status is "ok" on success and error is null; a null field means the value wasn't available for that input, not that the call failed.
{
"status": "ok",
"error": null,
"data": {
"total_flips": 10,
"flips": [
"Tails",
"Heads",
"Heads",
"Tails",
"Tails",
"Heads",
"Tails",
"Tails",
"Tails",
"Tails"
],
"heads_count": 3,
"tails_count": 7,
"heads_percentage": 30,
"tails_percentage": 70,
"longest_streak": {
"length": 4,
"type": "Tails"
},
"first_flip": "Tails",
"last_flip": "Tails",
"is_fair": false
}
}Fields
| Field | Type | Example | Description |
|---|---|---|---|
total_flips | number | 10 | Total number of coin flips performed in simulation |
flips | array | ["Tails","Heads","Heads"] | Array of individual flip results as Heads or Tails |
heads_count | number | 3 | Total count of heads outcomes from all flips |
tails_count | number | 7 | Total count of tails outcomes from all flips |
heads_percentagePremium | number | 30 | Percentage of heads outcomes as decimal |
tails_percentagePremium | number | 70 | Percentage of tails outcomes as decimal |
longest_streak | object | {…} | |
longest_streak.lengthPremium | number | 4 | Length of longest consecutive streak in results |
longest_streak.typePremium | string | Tails | Outcome type of longest streak (Heads or Tails) |
first_flip | string | Tails | Result of the first coin flip performed |
last_flip | string | Tails | Result of the last coin flip performed |
is_fairPremium | boolean | false | Statistical indicator of fair coin flip distribution |
Failure modes
Errors come back as tool errors with a sentence the model can act on, not a bare status code.
| Status | What it means |
|---|---|
400 / 422 | The arguments didn't validate. The message names the offending one. |
401 | The OAuth session is invalid or expired — reconnect the server. |
403 | Out of credits. Not a bad key — the month's allowance is spent. |
404 | This skill isn't part of VerveKit. Check the catalog. |
429 | Brief rate limit. Retrying after a moment succeeds. |
Other ways to use Coin Flip Skill
Set up Coin Flip Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.
Frequently asked questions
Do I have to tell the agent to use CoinFlipSkill?
No. The tool's name and description are in the model's context once the server is connected, so it selects the tool when the question calls for it. Naming it explicitly works too and is useful when you want to force the call.
Does connecting the server expose every tool at once?
Yes — one connection lists the whole VerveKit catalog. Clients with a tool budget can usually filter the list; the credit cost is per call, so an unused tool costs nothing.
What does a call cost?
1 credit each time the tool actually runs. A model that reasons about the tool without calling it costs nothing.
Is there a REST version of this?
Yes — the same source is available as a plain HTTPS endpoint on APIVerve, linked above. Same data, same credits, same account.