diff --git a/catalog.yaml b/catalog.yaml
index 3173410..38966d5 100644
--- a/catalog.yaml
+++ b/catalog.yaml
@@ -75,7 +75,7 @@ difft:
   desc: diff tool that compares files based on their syntax, not line-by-line
   website: https://difftastic.wilfred.me.uk/
   github: Wilfred/difftastic
-  tag: Rust, AST, tree-sitter
+  tags: Rust, AST, tree-sitter
 
 diskonaut:
   desc: Terminal disk space navigator, disk tree-map
@@ -89,7 +89,7 @@ dt:
   desc: duct tape for your unix pipes
   website: https://dt.plumbing/
   github: so-dang-cool/dt
-  tag: text-processing, Zig
+  tags: text-processing, Zig
 
 dua:
   desc: View disk space usage and delete unwanted data, fast.
@@ -133,7 +133,7 @@ flyscrap:
   desc: A standalone and scriptable web scraper in Go
   github: philippta/flyscrape
   website: https://flyscrape.com/
-  tag: Go, scrapping
+  tags: Go, scrapping
 
 fq:
   desc: jq for binary formats - tool, language and decoders for working with binary and text formats 
@@ -193,13 +193,13 @@ hx:
 
 jaq:
   desc: A jq clone focussed on correctness, speed, and simplicity
-  tag: rust
+  tags: rust
   github: 01mf02/jaq
 
 jj:
   desc: A Git-compatible DVCS that is both simple and powerful
   github: martinvonz/jj
-  tag: rust
+  tags: rust
 
 
 jless:
@@ -262,7 +262,7 @@ minify:
   desc: minifiers for web formats
   website: https://go.tacodewolff.nl/minify
   github: tdewolff/minify
-  tag: Go
+  tags: Go
 
 minijail:
   desc: sandboxing and containment tool used in ChromeOS and Android
@@ -290,7 +290,7 @@ mosh:
 navi:
   desc: Interactive cheatsheet tool for the command-line 
   github: denisidoro/navi
-  tag: rust
+  tags: rust
 
 ndcu:
   desc: a disk usage analyzer with an ncurses interface
@@ -343,7 +343,7 @@ qr:
 qsv:
   desc: CSV sliced, diced & analyzed
   github: jqnatividad/qsv
-  tag: Rust
+  tags: Rust
 
 redo:
   desc: create reusable functions from your history in an interactive way
@@ -353,7 +353,7 @@ relpipe:
   name: Relational pipes
   website: https://relational-pipes.globalcode.info/
   desc: Relational pipes are an open data format designed for streaming structured data between two processes.
-  tag: text-processing
+  tags: text-processing
 
 rlwrap:
   desc: A readline wrapper, with history and completion
@@ -378,12 +378,19 @@ semgrep:
   desc: Lightweight static analysis for many languages. Find bug variants with patterns that look like source code.
   website: https://semgrep.dev/
   github: semgrep/semgrep
-  tag: ocaml, pattern
+  tags: ocaml, pattern
 
 semgrepx:
   desc: xargs for semgrep 
   github: icholy/semgrepx
-  tag: Go
+  tags: Go
+
+sg:
+  name: ast-grep
+  desc:  fast and polyglot tool for code structural search, lint, rewriting at large scale
+  github: ast-grep/ast-grep
+  website: https://ast-grep.github.io/
+  tags: rust
 
 slugify:
   desc: generate sluged version of input
@@ -398,13 +405,13 @@ sk:
   desc: general fuzzy finder
   github: lotabout/skim
   cargo: skim
-  tag: rust
+  tags: rust
 
 so:
   desc:  A terminal interface for Stack Overflow 
   github: samtay/so
   cargo: so
-  tag: rust
+  tags: rust
 
 sqlite-utils:
   desc: manipulate sqlite db (ETL)
@@ -464,7 +471,7 @@ up:
 ups:
   desc: Command line tools for manipulating UPS patch files
   githb: rameshvarun/ups
-  tag: language:go
+  tags: go
 
 vd:
   fullname: VisiData