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make_table_from_json

Convert a JSON array into a formatted ASCII, Unicode, or Markdown table, supporting headers, custom styles, and auto-formatting for numeric columns.

Instructions

Parse a JSON array and render as a table.

Accepts either:

  • A 2D array: [["Name", "Value"], ["alpha", "1"], ...]

  • An object with "headers" and "rows" keys: {"headers":["Name"], "rows":[["alpha"]]}

Args: json_data: JSON string has_header: If True (default), first row is treated as column headers fmt: "grid" (default), "box", "safe", or "pipe" style: Table style (for grid fmt) auto_format: Auto-detect numeric columns

Returns: Formatted table.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
json_dataYes
has_headerNo
fmtNogrid
styleNomysql
auto_formatNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. Mentions auto-format feature and returns 'Formatted table' but lacks details on error handling, performance, or side effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Description is well-structured with a clear main purpose, examples, and parameter list. Slightly verbose but still efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers input formats, parameters, and return value. Lacks error handling details, but overall sufficient given 5 parameters and no annotations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, but description explains each parameter's purpose with examples (e.g., json_data, has_header, fmt, style, auto_format), adding significant meaning beyond the schema names.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Explicitly states it parses a JSON array and renders as a table, distinguishing it from sibling tools that handle CSV (make_table_from_csv) or other formats.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Describes two acceptable input formats but does not provide guidance on when to use this tool versus alternatives like make_table_from_csv or debug_table.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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