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LSP 3.18 allows servers to send [`MarkupContent` diagnostic messages](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.18/specification/#diagnostic), guarded by the client capability `textDocument.diagnostic.markupMessageSupport`. - Advertise `markup_message_support` only while pull diagnostics are enabled because `textDocument.diagnostic` is the pull-model capability. LSP 3.18 currently has no equivalent capability for push diagnostics: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.18/specification/#diagnosticClientCapabilities https://github.com/microsoft/language-server-protocol/issues/2246 - Handle `string | MarkupContent` messages in both push and pull diagnostic paths: markdown-kind messages populate the existing `Diagnostic::markdown` field (rendered in hover popovers and the diagnostics panel), plaintext-kind markup remains plain text, and plain string messages keep going through the adapter's `diagnostic_message_to_markdown`. - Preserve server-provided markup for code actions sent back to the originating server, avoid forwarding markup diagnostics to other servers, and render diagnostic metadata without altering the server-provided markdown. - Carry the markup kind over RPC via a new optional `LspDiagnostic.markup_message_kind` proto field so remote/collab projects round-trip `MarkupContent` messages. Depends on the lsp-types change that turns `Diagnostic.message` into a `DiagnosticMessage` enum (`string | MarkupContent`): https://github.com/zed-industries/lsp-types/pull/15 Once merged, Cargo.toml can point to the upstream commit. Note that Zed already rendered some plain-string diagnostics as Markdown through language-specific adapter hooks, including `rust-analyzer`. This adds protocol-level support for diagnostics explicitly sent as LSP 3.18 `MarkupContent`, while preserving the existing adapter fallbacks. As a result, this does not introduce a new diagnostics rendering pipeline. Server-provided Markdown is routed through the existing `Diagnostic::markdown` path, with small fixes to handle Markdown-only updates and block content correctly. ## Showcase Example from [JETLS.jl](github.com/aviatesk/JETLS.jl) (a Julia language server): > Before <img width="924" height="160" alt="Screenshot 2026-07-15 at 16 05 40" src="https://github.com/user-attachments/assets/b19fe9e3-50e3-44e4-9b4d-ac8bd438d3d6" /> > After <img width="924" height="160" alt="Screenshot 2026-07-15 at 14 13 05" src="https://github.com/user-attachments/assets/359c3382-118d-4fa6-aa91-6bd3661d3d28" /> --- Release Notes: - Added support for rendering LSP 3.18 Markdown diagnostic messages from language servers. --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Zed
Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
Installation
On macOS, Linux, and Windows you can download Zed directly or install Zed via your local package manager (macOS/Linux/Windows).
Other platforms are not yet available:
- Web (tracking discussion)
Developing Zed
Contributing
See CONTRIBUTING.md for ways you can contribute to Zed.
Also... we're hiring! Check out our jobs page for open roles.
Licensing
Zed source code is licensed primarily under GPL-3.0-or-later, with Apache-2.0 components where marked.
License information for third party dependencies must be correctly provided for CI to pass.
We use cargo-about to automatically comply with open source licenses. If CI is failing, check the following:
- Is it showing a
no license specifiederror for a crate you've created? If so, addpublish = falseunder[package]in your crate's Cargo.toml. - Is the error
failed to satisfy license requirementsfor a dependency? If so, first determine what license the project has and whether this system is sufficient to comply with this license's requirements. If you're unsure, ask a lawyer. Once you've verified that this system is acceptable add the license's SPDX identifier to theacceptedarray inscript/licenses/zed-licenses.toml. - Is
cargo-aboutunable to find the license for a dependency? If so, add a clarification field at the end ofscript/licenses/zed-licenses.toml, as specified in the cargo-about book.
Sponsorship
Zed is developed by Zed Industries, Inc., a for-profit company.
If you’d like to financially support the project, you can do so via GitHub Sponsors. Sponsorships go directly to Zed Industries and are used as general company revenue. There are no perks or entitlements associated with sponsorship.