# joaotavora/sly

Sylvester the Cat's Common Lisp IDE

Repository: https://github.com/joaotavora/sly
Canonical: https://ross.abutalabs.com/products/joaotavora-sly
Language: Common Lisp
License Family: other
Topics: lisp, emacs, common-lisp
Last push: 2026-08-01T13:17:57+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 95, release rhythm 8, longevity 100
- inputs: {"age_days": 4559, "days_push": 32, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1431, forks 157 (observed 2026-08-28T04:04:42.468272+00:00)

## What it is
SLY is a Common Lisp IDE for Emacs, a fork of SLIME with improved UX. It provides a full-featured REPL, live code annotations (stickers), flex completion, a trace dialog, inspectors, and debuggers.

## Use cases
- develop Common Lisp in Emacs
- get a better REPL for Common Lisp
- annotate code to record values as it runs
- trace function calls interactively in Lisp
- migrate from SLIME to a more modern Lisp IDE
- inspect and debug Common Lisp code interactively

## When to choose
- you write Common Lisp and use Emacs as your editor
- you want SLIME features with improved UX like stickers and backreferences
- you need multiple REPLs and inspectors simultaneously

## When to avoid
- you use another Lisp dialect like Scheme or Clojure
- you prefer a standalone IDE like LispWorks or a VS Code setup
- you don't use Emacs

## Facets
- artifact type: plugin
- maturity: active
- function: editor, developer-tools
- domain: programming-languages, developer-tools, text-editors
- platform: editor-plugin, cross-platform
- tags: common-lisp, ide, slime-fork, repl, emacs-lisp, emacs

## Member repositories
- joaotavora/sly (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:42.468272+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 2026-08-30T04:37:07.665710+00:00, confidence not recorded.
  - readme: https://github.com/joaotavora/sly (fetched 2026-08-28T04:04:42.468272+00:00, sha f3d3630d57c5)
- Data as of 2026-08-30T08:39:29.467469+00:00.