feat: add local read-only Discord MCP

[JoelBChapmanII]

No description provided.

[Copilot]

🟢 Ready to approve

The implementation consistently enforces the stated allowlisting boundaries and includes targeted tests validating the read-only tool surface and fail-closed behavior.

This review doesn't count toward merge requirements. Sign up for the private preview to control whether Copilot approvals count.

Pull request overview

This PR introduces a minimal TypeScript-based MCP server that exposes read-only Discord REST tools guarded by explicit local allowlists, aligning with the goal of a “local read-only Discord MCP”.

Changes:

• Added a read-only MCP server (src/server.ts) that exposes 5 Discord tools and enforces guild/channel allowlisting.
• Implemented a small Discord REST client plus config parsing/validation (src/discord.ts, src/config.ts) and a stdio entrypoint (src/index.ts).
• Added Node test-runner coverage for tool advertisement and fail-closed allowlisting behavior, plus expanded documentation and project scaffolding.

File summaries

File	Description
tsconfig.json	TypeScript build configuration for an ESM/NodeNext project outputting dist/.
package.json	Defines Node/TS toolchain, build/test scripts, and runtime dependencies for MCP + Discord REST.
package-lock.json	Locks dependency graph for reproducible installs.
src/config.ts	Parses env configuration and enforces required guild allowlisting + snowflake validation.
src/discord.ts	Discord REST wrapper, allowlist assertions, and error normalization.
src/server.ts	Implements the MCP tools (guild/channel/message read operations) with allowlist checks.
src/index.ts	Stdio-based executable entrypoint wiring config + Discord client into the MCP server.
test/config.test.ts	Tests config validation and allowlist parsing behavior.
test/server.test.ts	Tests tool surface (5 tools) and rejects non-allowlisted channel before Discord calls.
README.md	Documents safety boundaries, tools, setup, and usage (including Codex config).
.gitignore	Ignores build artifacts, dependencies, and local env files.
.env.example	Provides a template for required/optional environment variables.

Review details

• Files reviewed: 9/12 changed files
• Comments generated: 0
• Review effort level: Lite

We're testing this review assessment. Please use 👍 or 👎 to tell us if it's correct.