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arcade-mcp-ts: Instructions file for Claude Code

CLAUDE.md

arcade-mcp-ts CLAUDE.md is an instructions file for Claude Code from ArcadeAI/arcade-mcp-ts. It costs 1,246 tokens per session, scanned A, original, MIT.

A project instruction file for ArcadeAI’s TypeScript MCP package. MCP is a standard for connecting AI models to tools and services; the file covers its architecture, commands, conventions, and change checklist.

In plain words
What is it for?
Use it when developing, testing, building, or reviewing the arcade-mcp-ts TypeScript codebase.
Why use it?
It helps an agent follow the package’s runtime, testing, formatting, and design rules while working in the repository.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md.

This is ArcadeAI/arcade-mcp-ts's own configuration. It tells Claude Code how to work on arcade-mcp-ts itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything arcade-mcp-ts configures →

not rated 2repo 14d ago A scan 1,246 tokens original MIT archived
View source ↗ ArcadeAI/arcade-mcp-ts
Reuse

Borrowing it

Nothing to install: this file belongs to ArcadeAI/arcade-mcp-ts. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ArcadeAI/arcade-mcp-ts/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ArcadeAI/arcade-mcp-ts

Made for: Claude Code.

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Per session 1,246 This file is loaded in full into every session.
When invoked 1,246 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01246 $0.01246
Opus 5.5 $0.00498 $0.00498
Sonnet 5.5 $0.00249 $0.00249
Haiku 4.5 $0.00125 $0.00125

Measured 1mo ago against content hash 8fe2fd286445, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

arcade-mcp-ts CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — @arcadeai/arcade-mcp

TypeScript port of the Python arcade-mcp framework, published as @arcadeai/arcade-mcp. Wraps @modelcontextprotocol/sdk to add secret injection, OAuth auth providers, multi-user support, worker routes, and middleware.

Quick Reference

  • Runtime: Bun (primary), Node.js (compatible). No Bun.* APIs in src/.
  • Package manager: bun
  • Test runner: bun test (vitest)
  • Linter/formatter: bunx biome check --write .
  • Type check: bunx tsc --noEmit
  • Build: bun run build

Architecture

  • src/cli.ts — CLI entry point with auto-discovery (npx @arcadeai/arcade-mcp)
  • src/mcp-app.ts — MCPApp high-level builder API (entry point for users)
  • src/server.ts — ArcadeMCPServer wrapping SDK's McpServer, session registry
  • src/session.ts — ServerSession (state machine, server-initiated requests), RequestManager, NotificationManager
  • src/context.ts — Context with namespaced facades (log, progress, sampling, ui, etc.)
  • src/logger.ts — Shared createLogger() factory with JSON/pretty format support (MCP_LOG_FORMAT)
  • src/catalog.ts — ToolCatalog + MaterializedTool storage
  • src/executor.ts — Tool execution pipeline (Zod validation, context injection, error handling)
  • src/errors.ts — Tool-level error hierarchy (ToolkitError, RetryableToolError, etc.)
  • src/exceptions.ts — MCP-level exception hierarchy (MCPError, ServerError, TransportError, etc.)
  • src/event-store.ts — EventStore interface re-export + InMemoryEventStore for stream resumability
  • src/settings.ts — Env-based settings, auto-captures non-prefixed env vars as tool secrets
  • src/telemetry.ts — OTELHandler for OpenTelemetry traces + metrics via OTLP HTTP
  • src/auth/ — ToolAuthorization type + 20+ OAuth provider factory functions. Auth tokens resolved via @arcadeai/arcadejs SDK calling Arcade Cloud's POST /v1/auth/authorize
  • src/middleware/ — Composable middleware with method-specific hooks
  • src/resource-server/ — JWT Bearer token validation for multi-user HTTP auth
  • src/worker/ — Elysia routes for /worker/v1/* (Arcade Cloud integration)
  • src/transports/ — Stdio and HTTP (Elysia + StreamableHTTP) runners, dev-mode file watcher + auto-reload

Read the full file on GitHub · 67 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 67 lines · 1,246 tokens per session scan A 8fe2fd286445

Subscribe to this mod's changes

arcade-mcp-ts CLAUDE.md is an instructions file published in the GitHub repository ArcadeAI/arcade-mcp-ts (2 stars, last pushed 14d ago), licensed MIT. It adds 1,246 tokens to every session, about $0.0050 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

LLMOAuthai-toolsmcpmiddlewaremodel-context-protocol
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