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retoor 251c3dc2ba research: mcp-client-support subject (106 sources, 3 conclusions)

- wire spec: lifecycle, stdio + Streamable HTTP transports, tools,
  utilities, legacy SSE, versioning, changelog (14 Tier 1)
- client ecosystem: Claude Code/VS Code/Cursor/Codex configs,
  mcp-remote, Smithery, registries, Glama (12 Tier 1)
- security/ops: authorization draft, trust model, poisoning,
  rug pulls, production hardening (12 Tier 1) + 68 Tier 2 cards
- conclusions: minimal stdlib client on 2025-11-25, normalizer +
  resolver agent for pasted configs/GitHub URLs, untrusted-until-
  consent trust model; nothing built yet
- audit PASS (14 subjects, 797 sources, 32 conclusions)

2026-10-18 19:23:02 +02:00

2.8 KiB

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Ping utility (2025-11-25)

Metadata

Field	Value
Institute	Molodetz Institute - Research & Retrieval Division
Subject	mcp-client-support
Document type	Source Dossier
Tier	1
Source title	Ping utility (MCP Specification v2025-11-25)
Source URL	https://modelcontextprotocol.io/specification/2025-11-25/basic/utilities/ping
Source publisher / author	Model Context Protocol authors (Anthropic-donated open project; site docs)
Source type	standard
Source date (published)	2025-11-25 (version stamp; no other publish date stated)
Date researched	2026-10-18
Researched by	tai (agent), model: Claude Sonnet 5, on behalf of retoor
Research method	gather-subagent direct page fetch, parent synthesis from evidence pack
Confidence	High
Status	Active

Summary

Ping is an optional keepalive either party may use: a ping request with no params that the receiver must answer promptly with an empty result. On timeout the sender may treat the connection as stale, terminate it, or attempt reconnection. Implementations should ping periodically at a configurable frequency while avoiding excessive pinging.

Key findings

Ping is "an optional ping mechanism" usable by either party: {"jsonrpc":"2.0","id":"123","method":"ping"} with no params.
"The receiver MUST respond promptly with an empty response" ("result": {}).
On timeout the sender "MAY: Consider the connection stale; Terminate the connection; Attempt reconnection."
"Implementations SHOULD periodically issue pings… frequency SHOULD be configurable… Excessive pinging SHOULD be avoided."

Pros / strengths

Trivial to implement in both directions: no params to build, empty-object response, no capability negotiation needed.
Explicitly usable pre-initialization (the lifecycle page allows pings before the initialize response), so it doubles as a cheap liveness check during connect.
Sensible operational guidance: configurable frequency plus an explicit warning against excessive pinging.

Cons / limitations / caveats

No explicit author names or publish dates appear on the page; the date above is the version stamp in the URL, per the pack's Uncertainty notes.
Optional and low-value for short-lived stdio clients: keepalive matters mostly for long-lived HTTP sessions, so a minimal client can defer ping-sending (but must still answer incoming pings with {}).
Removed in the 2026-07-28 revision (see the changelog dossier), so ping code is handshake-era-only investment.

Relevance to tai

Optional keepalive: a minimal client can implement ping-sending and must answer incoming pings with {}. Cheap to add, easy to defer except for the response path.

Changelog

Date	Change
2026-10-18	Initial dossier created.

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