Output formatter

Output Formatter

Context

Activate this skill when the user requires structured, well-formatted output or when the response format matters as much as the content. Use this skill when:

• The user requests a specific output format (JSON, table, markdown, etc.)
• The response will be consumed by another system or tool
• The user needs data presented in a scannable, structured way
• Generating reports, documentation, API responses, or configuration files
• Any context where formatting inconsistencies would reduce clarity or break tooling

Do not use for informal conversational responses where rigid formatting would feel unnatural or counterproductive.

Instructions

Step 1: Determine the Output Format

Assess the content type and user request to select the appropriate format:

Content Type	Recommended Format
Structured data / API payloads	JSON
Comparisons / metrics / features	Markdown table
Prose with structure	Markdown with headings
Code snippets	Fenced code blocks with language tag
Mixed content	Combination with clear separators
Configuration / data files	YAML, TOML, or JSON as appropriate

Step 2: Apply Markdown Rules

When using markdown:

Heading hierarchy:

• Use # for the document title (only once, at the top)
• Use ## for major sections
• Use ### for subsections
• Never skip levels (e.g., # directly to ###)
• Do not use more than 3 heading levels in a single response unless the document is long-form

Lists:

• Use - for unordered lists (not * or +)
• Use 1. for ordered lists
• Nested lists: indent 2 spaces per level
• Keep list items to one line where possible; break long items across lines

Emphasis:

• Use **bold** for key terms, labels, and emphasis
• Use `backticks` for inline code, variable names, and technical terms
• Never use _underscores_ for emphasis (can conflict with markdown in some renderers)

Horizontal rules:

• Use --- to separate major sections
• Do not use horizontal rules between every paragraph

Step 3: Apply JSON Rules

When producing JSON:

• Validate that the output is parseable JSON (no trailing commas, no comments, proper quoting)
• Use consistent indentation (2 spaces, not tabs)
• Quote all keys — never use unquoted keys
• Use null for missing values, never omit the key
• For arrays of objects, ensure every object has the same keys in the same order
• Wrap in a fenced code block with json language tag

Step 4: Apply Table Rules

When producing markdown tables:

• Always include a header row
• Always include a separator row (|---|---|)
• Align columns logically: numbers right-aligned, text left-aligned
• Keep cell content short — tables are for scanning, not reading
• Use N/A or — for empty cells, never leave them blank
• Limit to 5–7 columns maximum for readability
• For wide tables, consider splitting into multiple focused tables

Step 5: Apply Code Block Rules

When producing code:

• Always use fenced code blocks with triple backticks
• Always include the language tag (e.g., python, bash, ```json)
• For multi-line code, ensure consistent indentation
• Add brief comments for non-obvious logic
• Keep code examples minimal and focused — don't paste entire files
• When showing diffs or changes, clearly mark what is new vs. existing

Step 6: Final Validation

Before outputting, run through this checklist:

• Does the format match what the user requested?
• Are all headings, tables, and code blocks properly closed?
• Is the hierarchy consistent (no skipped heading levels)?
• Is the JSON parseable (if applicable)?
• Would a machine be able to consume this without errors?

Constraints

1. No mixed formatting within a single element. A table cell must not contain a code block. A list item must not contain a nested table unless explicitly requested.
2. Consistent whitespace. Use the same indentation style throughout. No mixed tabs and spaces.
3. No raw HTML unless explicitly requested. Stick to standard markdown syntax.
4. JSON must always be valid. Invalid JSON is never acceptable — validate before outputting.
5. Tables must always have headers. Headerless tables are forbidden.
6. Code blocks must always have a language tag. Untagged code blocks are forbidden.
7. Respect the user's format request. If the user says "give me JSON," give JSON — not markdown wrapping JSON. Format selection is user-driven, not agent-driven.
8. Length discipline. Use formatting to reduce verbosity, not increase it. If a table replaces a 20-line list, that is the correct outcome.

Examples

Example 1: Structured API Response

User: "Give me a JSON schema for a user profile endpoint."

Output:

{
  "endpoint": "/api/v1/users/{id}/profile",
  "method": "GET",
  "response": {
    "schema": {
      "id": "string (UUID)",
      "email": "string",
      "display_name": "string",
      "avatar_url": "string (URL, nullable)",
      "role": "string (enum: admin, editor, viewer)",
      "created_at": "string (ISO 8601)",
      "updated_at": "string (ISO 8601)",
      "metadata": {
        "bio": "string (max 500 chars)",
        "location": "string (nullable)",
        "website": "string (URL, nullable)"
      }
    }
  },
  "errors": {
    "404": "User not found",
    "401": "Authentication required",
    "403": "Insufficient permissions"
  }
}

Example 2: Feature Comparison Table

User: "Compare Redis, Memcached, and DynamoDB DAX for caching."

Output:

Feature	Redis	Memcached	DynamoDB DAX
Data types	Strings, lists, sets, hashes, streams	Strings only	DynamoDB items
Persistence	Optional (RDB/AOF)	None (in-memory only)	Transparent (DynamoDB-backed)
Replication	Primary-replica	None	Managed by AWS
Max memory	Limited by available RAM	Limited by available RAM	Tied to DynamoDB table
Latency (P99)	<1ms	<1ms	~1–3ms
Multi-region	Enterprise feature	Not supported	Native via DynamoDB Global Tables
Deployment	Self-hosted or Managed (ElastiCache)	Self-hosted or Managed (ElastiCache)	Fully managed (AWS only)
Best for	Complex caching, pub/sub, session store	Simple key-value, LRU caching	DynamoDB-native workloads

Key takeaway: Redis is the most versatile option. Memcached is the simplest for pure LRU caching. DynamoDB DAX is the right choice only if your primary datastore is already DynamoDB.