Pack local or remote codebases into AI-friendly files that LLMs and coding agents can read or search
Nothing to run from here
Payload Validator is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
5
tools declared
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trust score
remote
at its publisher
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calls last 7d
What it does
Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http payload-validator-mcp https://payload-validator.gumballtools.com/api/mcp
# 2 — ask your agent for something these tools do
# validate_json, validate_yaml, validate_xml and 2 more
Payload Validator costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
GUAll 15 servers
gumballtools15 servers
8 categories
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http payload-validator-mcp https://payload-validator.gumballtools.com/api/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
5 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Validates a JSON document and reports every problem with an exact line and column. Use this whenever you need to know why a JSON payload is failing, or to check a JSON document you or a user produced before sending it somewhere that will reject it. Do not do this by reading the JSON yourself. Three of the findings are invisible to inspection and to JSON.parse alike: (1) Duplicate keys. `{"port":
| Parameter | Type | Required | Notes |
|---|---|---|---|
| input | string | yes | The raw document text, not a parsed object — the findings are properties of the text. Up to 1,000,000 bytes. |
Validates a YAML document, including the values that mean different things to different YAML loaders. Use this for any YAML you are about to write or have just been given — CI configs, Kubernetes manifests, docker-compose files, OpenAPI specs, Ansible playbooks. Do not reason about YAML type resolution yourself. It is the single most reliable way to be confidently wrong about a config file, beca
| Parameter | Type | Required | Notes |
|---|---|---|---|
| input | string | yes | The raw document text, not a parsed object — the findings are properties of the text. Up to 1,000,000 bytes. |
Validates an XML document for well-formedness, namespace correctness, and the entity-based attacks that arrive as XML. Use this before parsing XML you received, and when an XML document is being rejected by something that will not say why. Do not eyeball this. Four classes of genuinely invalid XML are accepted by ordinary well-formedness checkers, so "it validated" does not mean what it appears
| Parameter | Type | Required | Notes |
|---|---|---|---|
| input | string | yes | The raw document text, not a parsed object — the findings are properties of the text. Up to 1,000,000 bytes. |
Validates CSV text against RFC 4180 and reports ragged rows individually, with both field counts. Use this before loading a CSV, and whenever a CSV-derived number looks wrong. Do not attempt this by reading the file, and be aware that loading it successfully proves nothing. The failure that matters is the ragged row: a file where one row has six fields and the header has five loads without compl
| Parameter | Type | Required | Notes |
|---|---|---|---|
| input | string | yes | The raw document text, not a parsed object — the findings are properties of the text. Up to 1,000,000 bytes. |
| delimiter | string | no | Field delimiter, as a single character. Omit to sniff it from the header. Pass it when you know it — a semicolon-separated European export read as comma-separated produces one column and no error. |
| hasHeader | boolean | no | Whether the first row names the columns. Default true. Pass false and rows are compared against the first row instead, and header checks are skipped. |
Detects whether a payload is JSON, YAML, XML or CSV, then validates it. Use this when you have a blob of text and do not know what it is — a file with no extension, a clipboard paste, a response body with an unhelpful content type, or a config file whose format you would otherwise have to guess. Detection is structural and the reason is always returned, so the assumption is visible rather than h
| Parameter | Type | Required | Notes |
|---|---|---|---|
| input | string | yes | The raw document text, not a parsed object — the findings are properties of the text. Up to 1,000,000 bytes. |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install Payload Validator or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
—Grade not published
No rule-by-rule report on file for this release
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
This listing is an address its publisher runs, and you connect to it directly — this marketplace is not in the path. The scanner reads packages and public source, and an address is neither. So there is no grade — not a withheld one, an unmeasured one.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 0.1.0.
0.1.0
undated
latestNo release note was published with this version.
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no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish Payload Validator can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.