mcp-fmt
MCP ServerFreeFormat MCP tool results into markdown that renders in Claude Code's terminal
Capabilities5 decomposed
mcp tool result markdown formatting for claude code terminal
Medium confidenceTransforms raw MCP tool execution results into Claude Code-compatible markdown syntax that renders correctly in the Claude Code terminal interface. Uses markdown formatting conventions (code blocks, tables, lists) optimized for Claude's terminal renderer, handling multi-line output, structured data, and error states with appropriate visual hierarchy and syntax highlighting directives.
Purpose-built formatter specifically targeting Claude Code's terminal markdown parser rather than generic markdown — understands Claude Code's specific rendering quirks and limitations, enabling pixel-perfect terminal output formatting that wouldn't work in standard markdown renderers
Solves Claude Code-specific formatting problems that generic markdown formatters ignore, ensuring MCP tool results render correctly in Claude's terminal without requiring manual post-processing or workarounds
mcp schema-aware result serialization with type preservation
Medium confidenceAnalyzes MCP tool result schemas and preserves type information during markdown serialization, enabling intelligent formatting decisions based on result structure (e.g., rendering JSON objects as tables when appropriate, preserving code block language hints for code results). Likely uses MCP schema introspection to determine optimal markdown representation for each result type.
Integrates with MCP schema system to make intelligent formatting decisions based on result types rather than treating all output as plain text — uses schema metadata to determine whether to render as table, code block, or list
Smarter than generic formatters because it understands MCP schemas, enabling automatic optimal formatting that requires zero configuration from tool developers
error and exception markdown rendering with context preservation
Medium confidenceFormats error messages, stack traces, and exception details into readable markdown that preserves debugging context while remaining visually clean in Claude Code terminal. Likely uses syntax highlighting for stack traces, separates error messages from context, and formats nested error chains with proper indentation and hierarchy.
Specifically optimizes error rendering for Claude Code terminal constraints rather than generic error formatting — understands that terminal space is limited and structures error output for scannability with collapsible detail sections
Better than raw stack trace dumps because it applies markdown hierarchy and formatting to make errors scannable, and better than generic error formatters because it's tuned for Claude Code's specific terminal rendering
multi-line output chunking and terminal-aware pagination
Medium confidenceIntelligently chunks large tool outputs into terminal-friendly segments that respect Claude Code's line-length and height constraints, using markdown section breaks and code block boundaries to maintain readability. Likely implements heuristics for breaking at logical boundaries (function definitions, JSON objects, table rows) rather than arbitrary character limits.
Implements Claude Code-specific pagination logic that respects terminal dimensions and markdown rendering constraints rather than generic line-wrapping — uses semantic boundaries (code blocks, JSON objects) for intelligent chunking
Smarter than simple line-wrapping because it chunks at logical boundaries, and better than no pagination because it prevents terminal overflow while maintaining readability
code block syntax highlighting directive generation
Medium confidenceAutomatically detects code content in tool results and wraps it in markdown code blocks with appropriate language hints (e.g., javascript, sql, ) for Claude Code's syntax highlighter. Uses heuristics or explicit type information from MCP schemas to determine language, enabling proper syntax highlighting in the terminal.
Integrates language detection with MCP schema metadata to reliably identify code language and apply correct markdown syntax hints, rather than relying on heuristics alone
More reliable than generic code formatters because it uses MCP schema information when available, and better than no highlighting because it automatically applies language hints without manual specification
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓MCP server developers building tools for Claude Code integration
- ✓Teams using Claude Code as their primary IDE with custom MCP tools
- ✓Developers creating multi-tool MCP servers that need consistent output formatting
- ✓MCP servers with well-defined tool schemas and return types
- ✓Teams building data-heavy MCP tools (database queries, API responses, file listings)
- ✓Developers who want automatic, schema-driven output formatting without manual format specification
- ✓MCP tools that frequently fail or throw exceptions (file operations, API calls, database queries)
- ✓Developers debugging MCP tool failures within Claude Code
Known Limitations
- ⚠Only formats output for Claude Code terminal — not compatible with other MCP clients or standard terminals
- ⚠No support for ANSI color codes or terminal escape sequences — relies on markdown syntax only
- ⚠Limited to markdown rendering capabilities of Claude Code's terminal parser — advanced formatting may not render
- ⚠Requires MCP server to explicitly call formatter — no automatic interception of tool results
- ⚠Requires MCP tools to define proper schemas — untyped or poorly-defined tools may format suboptimally
- ⚠Complex nested structures may not serialize to readable markdown tables
Requirements
Input / Output
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Format MCP tool results into markdown that renders in Claude Code's terminal
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