Specimen HL-005 · macOS

Lexicon

An AI prompt library and manager for macOS with a built-in MCP server. Organize, template, and trigger your best prompts straight from Claude.

Request Access → $1.99/mo

PlatformmacOS 14+

StorageSQLite · local

ProtocolMCP · Claude

TelemetryNone

Access$1.99 / month

01 / 03

Capabilities

What it does.

Prompt library

Every prompt, versioned and searchable in one place.

Template variables

Parameterize prompts; fill the blanks at call time.

Smart collections

Auto-group prompts by tag, use, or project.

Slash commands

Trigger any prompt from Claude Desktop and Claude Code.

AI Integration

Wired to Claude
through MCP.

Lexicon ships a Model Context Protocol server. Connect it once and trigger any prompt — variables filled — straight from the conversation.

▸ Slash commands in Claude Desktop & Code

▸ Template variables resolved at call time

▸ Local-only — prompts never leave your Mac

claude — mcp · lexicon

› claude mcp add lexicon

connecting to local server …

✓ registered · 0 cloud calls

› /review-pr lang=swift focus=perf

resolving template @ ~/lexicon.db

→ 3 variables filled · prompt ready

› █

Field UseWhere it earns its keep

Building a Prompt Library Organize, template, and reuse your best prompts — local-only storage.

Code Review Prompts Variables for language, framework, and focus; trigger as slash commands.

AI Writing Workflows Editing, tone, and drafting prompts, consistent across audiences.

Data Analysis Prompts Reusable templates for source, output format, and chart styling.

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