Ask262
Give your coding agent authoritative ECMAScript-spec answers when you are implementing or debugging JavaScript behavior instead of guessing from blogs or outdated Stack Overflow threads.
Overview
Ask262 is a MCP server for the Build phase that answers JavaScript internals questions using the ECMAScript (ECMA-262) specification through a streamable-HTTP Model Context Protocol remote.
What is this MCP server?
- Remote streamable-HTTP MCP endpoint at ask262.mcp.bendtherules.io for ECMAScript specification lookups
- Answers grounded in the official ECMA-262 specification instead of anecdotal JavaScript folklore
- Helps agents explain coercion, builtins, grammar, and subtle runtime semantics with spec citations
- Useful when debugging “why does this actually run?” behavior in modern JS engines
- Open-source package io.github.bendtherules/ask262 version 0.0.13 on GitHub at bendtherules/ask262
- Server schema: Model Context Protocol 2025-12-11
- Published version: 0.0.13
- Remote transport: streamable-HTTP at ask262.mcp.bendtherules.io/mcp
What problem does it solve?
You waste hours and ship subtle bugs when you and your agent rely on folk knowledge instead of what ECMA-262 actually mandates for JavaScript behavior.
Who is it for?
Solo builders using Claude Code, Cursor, or Codex who frequently touch advanced JavaScript, need spec-accurate agent answers, and want a zero-repo MCP remote for ECMA-262 lookups.
Skip if: Teams that only write trivial DOM glue with no spec edge cases, or anyone who needs runtime profiling, bundle analysis, or non-JavaScript language reference instead of ECMAScript.
What do I get? / Deliverables
After you register Ask262, your agent can cite spec-aligned explanations for JS semantics so implementation and debugging decisions match the real language contract.
- Spec-oriented explanations of JavaScript language behavior from ECMA-262
- Faster agent-assisted debugging when implementation disagrees with engine output
- A registered remote MCP integration listed as io.github.bendtherules/ask262 without cloning a skill repo
Recommended MCP Servers
Journey fit
JavaScript internals and spec semantics matter most while you are actively building features, wiring runtimes, and teaching an agent how to reason about language edge cases before code ships. Ask262 is registered as an MCP server, so its natural home on Skillselion is Build → agent-tooling: it extends Claude Code, Cursor, and similar agents with a dedicated spec-backed knowledge remote rather than replacing a project skill.
How it compares
Spec-backed MCP integration for agents, not a local agent skill or a test runner.
Common Questions / FAQ
Who is Ask262 for?
Ask262 is for indie and solo developers who ship JavaScript or TypeScript with AI coding agents and want ECMAScript specification grounding when language behavior is unclear.
When should I use Ask262?
Use Ask262 while building or debugging JavaScript when behavior surprises you—coercion, promises, classes, modules—or when you need your agent to justify an approach with spec-level accuracy.
How do I add Ask262 to my agent?
Add the io.github.bendtherules/ask262 MCP server to your client using the streamable-HTTP remote URL https://ask262.mcp.bendtherules.io/mcp, then invoke it from Claude Code, Cursor, or any MCP-compatible agent.