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Squiggles MCP server

by carldaws·io.github.carldaws/squiggles·v1.0.2·6 stars
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Let your coding agent see the squiggles — LSP diagnostics, navigation, refactoring, and extras

A92/100grade A
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Safety scan
A92/100

full report

Adoption
Growing

6 stars38 downloads/wk

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Squiggles tools (30, 3 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • call_hierarchy_incoming

    Find all functions/methods that call the function at the given position.

  • call_hierarchy_outgoing

    Find all functions/methods that are called by the function at the given position.

  • clangd_ast

    Show the Clang AST for a range in a C/C++ file

  • clangd_switch_source_header

    Switch between a C/C++ source file and its corresponding header

  • clangd_symbol_info

    Get the USR and symbol details for the symbol at the given position

  • code_actions

    Get available code actions (quick fixes, refactorings) at the given position. Diagnostics overlapping the range are passed to the server so quick fixes are included.

  • diagnostics

    Get current diagnostics (errors, warnings) for a file. If no file is specified, returns diagnostics for all currently open files with issues. Waits for fresh results after recent edits.

  • document_symbols

    Get all symbols (functions, classes, variables, etc.) defined in a file as a hierarchical tree.

  • find_references

    Find all references to a symbol across the project. Returns every location where the symbol is used.

  • format

    Format a file using the language server's formatter and write the result to disk.

  • go_add_import

    Add an import path to a Go file. Applies the change to disk.

  • go_list_imports

    List the imports of a Go file and the package it belongs to

  • go_list_known_packages

    List packages that are importable from the given Go file

  • go_mod_tidywrite action

    Run go mod tidy for the module containing the given go.mod file

  • go_modules

    List Go modules found under a directory

  • go_vulncheckwrite action

    Run govulncheck to find known vulnerabilities in dependencies. May take a while on first run.

  • goto_declaration

    Go to the declaration of a symbol (relevant in C/C++ for header declarations).

  • goto_definition

    Go to the definition of a symbol at the given position. Returns the file and location where the symbol is defined.

  • goto_implementation

    Go to implementations of an interface or abstract method. Returns concrete implementation locations.

  • goto_type_definition

    Go to the type definition of a symbol. Returns where the type of the symbol at the given position is defined.

  • hover

    Get hover information (type signature, documentation) for a symbol at the given position.

  • open_file

    Open a file in the LSP server. This triggers diagnostics and makes the file available for subsequent no-arg diagnostics calls.

  • rename

    Rename a symbol across all affected files. Returns the workspace edit, or applies it to disk when apply is true.

  • rename_prepare

    Check if a symbol at the given position can be renamed, and get its current name.

  • signature_help

    Get parameter information for a function call at the given position.

  • ts_go_to_source_definition

    Go to the source definition (the implementation, not the .d.ts declaration) of a symbol

  • ts_organize_imports

    Sort imports and remove unused ones in a TypeScript/JavaScript file. Applies the changes to disk.

  • ts_rename_filewrite action

    Update all imports that reference a file after it has been moved or renamed on disk. Move the file first, then call this. Applies the changes to disk.

  • type_hierarchy

    Get the type hierarchy (supertypes and subtypes) for the type at the given position.

  • workspace_symbols

    Search for symbols across the entire project by name. Supports fuzzy matching.

Public scan report

scanner v0.1.10 · 2026-10-15 · same rubric, same numbers if you re-run it

no findings
  • Code scan31 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 20 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Squiggles compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
92/100
higher than 90% of 4,461 AI and agents servers
Tools
30
the typical AI and agents server has 6
Tools that change things
10%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
6
more than 80% of 2,713 AI and agents servers
Downloads a week
38
more than 28% of 1,554 AI and agents servers with a package

What its tools let an agent do: 24 read · 1 create · 5 change

Install Squiggles in Claude Code, Cursor or VS Code

Runs npx -y squiggles on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add squiggles -- npx -y squiggles
Add to Cursor

What the publisher says

From the Squiggles repository's README, as published. We do not edit it. Read it on GitHub

squiggles

Let your agent see the squiggles you'd see in an IDE.

squiggles is an MCP server that bridges coding agents to Language Server Protocol (LSP) servers. Configure one or more LSP servers and squiggles exposes their features — diagnostics, go-to-definition, find references, rename, formatting, and more — as MCP tools. Servers start lazily on first tool use, so there's no startup cost for languages you don't touch.

Beyond the standard protocol, squiggles unlocks the custom superpowers each language server ships that editors rarely surface and agents otherwise never see: expanding a Rust macro, discovering Ruby tests, switching between a C++ source file and its header, fixing every import after moving a TypeScript file, running govulncheck through gopls.

Quick Start

claude mcp add squiggles -- npx -y squiggles

Then, in your project root:

npx squiggles init

This writes a squiggles.yaml for the languages it finds (a tsconfig.json means TypeScript, a Cargo.toml means Rust, and so on). Name the servers to choose them yourself: npx squiggles init typescript ruby. Presets exist for typescript, rust, ruby, go, python, cpp and lua; each needs its language server on PATH, and init prints the install command for every one it writes.

The result for a TypeScript project:

servers:
  typescript:
    command: ["typescript-language-server", "--stdio"]
    filePatterns: ["**/*.ts", "**/*.tsx", "**/*.js", "**/*.jsx"]

Configuration

squiggles looks for squiggles.yaml, squiggles.yml, .squiggles.yaml, or .squiggles.yml in the project root (the old mclsp.yaml names still work). Each server entry supports:

Multiple servers can be configured for different languages:

servers:
  typescript:
    command: ["typescript-language-server", "--stdio"]
    filePatterns: ["**/*.ts", "**/*.tsx", "**/*.js", "**/*.jsx"]
  rust:
    command: ["rust-analyzer"]
    filePatterns: ["**/*.rs"]
  ruby:
    command: ["ruby-lsp"]
    filePatterns: ["**/*.rb"]
  go:
    command: ["gopls"]
    filePatterns: ["**/*.go", "go.mod", "go.sum"]
  cpp:
    command: ["clangd"]
    filePatterns: ["**/*.c", "**/*.h", "**/*.cpp", "**/*.hpp"]

Tools

All standard LSP tools are registered and available when a matching server is configured.

Navigation: gotodefinition, gototypedefinition, gotoimplementation, gotodeclaration, findreferences

Inspection: hover, signaturehelp, documentsymbols, workspace_symbols

Refactoring: codeactions, renameprepare, rename, format

Hierarchy: callhierarchyincoming, callhierarchyoutgoing, type_hierarchy

Always available: open_file, diagnostics

Position-based tools take file (relative path), line (1-indexed), and col (1-indexed). rename accepts apply: true to write the edit to disk instead of returning it; format always writes to disk. code_actions automatically passes the diagnostics overlapping the requested range, so quick fixes show up.

Server Extensions

The best language servers go far beyond the standard protocol, and this is where squiggles earns its keep: it subscribes to the custom methods and commands that IDE plugins use but agent harnesses ignore. Extension tools register automatically when a matching server is configured.

Ruby (ruby-lsp)

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Squiggles: common questions

Is Squiggles MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Squiggles safety report
How do I install Squiggles?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Squiggles need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Squiggles maintained?
The last commit was 41 days ago (2026-09-25). The latest release is v1.0.2.
What can I use instead of Squiggles?
Servers from other publishers that do the same job: Serena MCP: the IDE for your agent MCP server, Figma Context MCP server and SuperCompress MCP server.
How does Squiggles compare with other AI and agents MCP servers?
safety score 92/100 (higher than 90% of 4,461 AI and agents servers); tools 30 (the typical AI and agents server has 6); tools that change things 10% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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