# microsoft/language-server-protocol

Defines a common protocol for language servers.

Repository: https://github.com/microsoft/language-server-protocol
Canonical: https://ross.abutalabs.com/products/language-server-protocol
Homepage: https://microsoft.github.io/language-server-protocol/
Language: HTML
License: CC-BY-4.0
License Family: other
Last push: 2026-08-26T13:49:50+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 4016, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 12995, forks 995 (observed 2026-08-28T04:11:00.349833+00:00)

## What it is
The official specification repository for the Language Server Protocol (LSP), a JSON-RPC-based protocol standardizing communication between editors/IDEs and language servers that provide features like autocomplete, go-to-definition, and hover documentation. It also covers the Language Server Index Format (LSIF) for rich code navigation without local source code.

## Use cases
- standardize how editors talk to language servers
- implement a language server for my programming language
- add autocomplete and go-to-definition to my IDE without per-tool rework
- reuse one language server across multiple editors
- understand the LSP 3.18 specification
- enable code navigation in a web UI without local source via LSIF

## When to choose
- you are building a language server or editor language integration and need the canonical protocol spec
- you want to avoid reimplementing language features for every editor or IDE

## When to avoid
- you need an actual language server implementation or client SDK rather than the protocol specification
- you need a ready-to-run tool rather than a standards document

## Facets
- artifact type: learning-resource
- maturity: active
- function: documentation, developer-tools, editor, sdk
- domain: developer-tools, text-editors, apis, documentation, programming-languages
- platform: cross-platform, editor-plugin
- tags: specification, language-server-protocol, lsp, lsif, json-rpc, ide-integration, editor-tooling

## Member repositories
- microsoft/language-server-protocol (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:00.349833+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:13:36.833025+00:00, confidence not recorded.
  - homepage: https://microsoft.github.io/language-server-protocol/ (fetched 2026-08-29T08:09:21.133295+00:00, sha 841cb2de30bb)
- Data as of 2026-08-30T08:39:29.467469+00:00.