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JSON Configuration Agent Skill

by github

Validate supplied JSON configuration and look up values by JSON Pointer using the local JSON configuration MCP tools. Use for checking whether JSON is valid or locating a specific configuration value. Don't use for YAML, arbitrary filesystem browsing, or unrelated coding and factual questions.

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SKILL.md, read when the skill is used
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
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stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/github/plugin-marketplace-starter --skill json-configuration

The instruction itself

1 sections, as written by the author

Inspect JSON configuration

Use the bundled local MCP tools rather than guessing from the text.

  • Obtain the JSON text and, for lookup requests, the JSON Pointer. Don't read unrelated files or credential stores.
  • Call validate_json to check syntax. Report its valid result. If the JSON is invalid, report INVALID_JSON; don't silently repair the input.
  • For a lookup, call get_json_value with the unchanged JSON and pointer. Empty pointer selects the whole document; ~1 represents / and ~0 represents ~ within a key.
  • Report the actual returned value. Distinguish found: true with value: null from NOT_FOUND. Report INVALID_POINTER separately. Don't invent a default value.

The server accepts at most 1,048,576 characters of JSON text. Numbers use finite JavaScript number semantics, not arbitrary precision. Overflowing numbers are explicitly rejected rather than converted to null; use JSON strings for exact large integers or decimals. It has no network, filesystem, or credential access and doesn't persist the supplied JSON. Don't include sensitive JSON in saved reports unless the user explicitly requests it.

If the tools aren't available, state that the JSON configuration plugin isn't connected. Don't claim tool-backed validation without a real tool call. No edits or other side effects are needed.

How to use it

Copy the folder

Take github/json-configuration from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.