Payload Validator

Install

Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install connector/gumballtools-com-payload-validator

About

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools

5 read · 0 write · 0 deleteRead-only

Secrets

None asked for

Install scripts

Nothing to install (hosted)

Runs as

Hosted (remote endpoint)

Tools (5)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

• validate_autoDetect the format and validateread-only

  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 hidden: a leading `<` is XML, a leading `{` or `[` is JSON, a `%YAML` directive or `key: value` lines are YAML, and a consistent delimiter count across multiple lines is CSV. JSON is checked before YAM…

• validate_csvValidate CSVread-only

  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 complaint almost everywhere — pandas pads or throws depending on the engine, Excel shifts the columns, and `split(",")` silently mis-assigns every field after the extra one. Nobody notices until a figure i…

• validate_jsonValidate JSONread-only

  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":8080,"port":9090}` is accepted by every mainstream parser, which keeps the last value and discards the first without a word. Reading it, you cannot see which one the consumer will use, because the ans…

• validate_xmlValidate XMLread-only

  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 to: (1) Two root elements. `<a/><b/>` is not a valid XML document; XML permits exactly one outermost element. Concatenated records hit this constantly. (2) Undeclared namespace prefixes. `<x:a>` with …

• validate_yamlValidate YAMLread-only

  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, because YAML 1.1 and YAML 1.2 resolve the same plain scalar to different values and real loaders disagree about which to implement — PyYAML is 1.1, Go's yaml.v3 and the yaml npm package are 1.2: - `no`, `…

Signals

Last release

Sep 6, 2026 (1 month ago)

Repository

Not found on GitHub (deleted or private)

Details

Registry name

com.gumballtools/payload-validator

Version

0.1.0

Auth

Auth not stated

License

License unknown

Repository

github.com/bwalvoord/gumball

Website

payload-validator.gumballtools.com

First seen

Oct 24, 2026

Last checked

Oct 24, 2026

Source

Official MCP Registry