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stacks

Go library module

A reusable Go module with no binary, for other Go code to import. A small documented API with sentinel and typed errors for errors.Is and errors.As, runnable examples, fuzzing, a consumer module that imports it from outside, and an apidiff check against the last release.

What done means

Your agent follows the brief, then runs stacks verify without weakening or skipping checks. What happens next

Declared steps: install, fmt-check, vet, lint, tidy, test, fuzz, consumer, api-check, readme-filled. View commands

Use this stack

Paste the prompt into the coding agent working on your project.

Project intent

Uses the stack’s default fragments. Review the brief with your agent.Uses stated defaults and omits deploy, release, and app fragments unless explicitly requested.

View prompt
Use the go-library stack for this project. 1. Run npx @steamfield/stacks show go-library --json and check that it fits the project. If it does not, explain why before changing files. 2. Run npx @steamfield/stacks new go-library and follow the brief it prints. 3. From the generated project directory, run npx @steamfield/stacks verify. Fix failures without weakening or skipping verification steps. 4. Summarize what changed and the verification result. Quote published stats only when they are available, including their interval and sample size. The stacks docs, written for agents, are at https://stacks.steamfield.io/llms.txt.
Use the go-library stack for a quick local experiment. 1. Run npx @steamfield/stacks show go-library --json and check that it fits the project. If it does not, explain why before changing files. 2. Run npx @steamfield/stacks new go-library --sandbox and follow the brief it prints. 3. From the generated project directory, run npx @steamfield/stacks verify. Fix failures without weakening or skipping verification steps. 4. Summarize what changed and the verification result. Quote published stats only when they are available, including their interval and sample size. The stacks docs, written for agents, are at https://stacks.steamfield.io/llms.txt.
Or use the terminal
npx @steamfield/stacks new go-library
npx @steamfield/stacks new go-library --sandbox
Verify steps
StepPhaseLayerCommand
installsetupinstallmake install
fmt-checkchecklintmake fmt-check
vetchecktypecheckmake vet
lintchecklintmake lint
tidycheckcheckmake tidy-check
testchecktestmake test
fuzzchecktestmake fuzz
consumerchecktestmake consumer
api-checkcheckcheckmake api-check
readme-filledcheckchecktest -s README.md && ! grep -n 'stacks:fill' README.md

Usage and outcomes

Usage over time

Showing 180 days of history.

History

The 28-day green rate at each weekly observation. Gaps mean the sample was too small to publish.

Jul 1Oct 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jul 1Oct 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jul 1Oct 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jul 1Oct 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 10%50%100%95% Wilson interval95% Wilson intervalPublished 28-day green rate12 Jul 2026: 76% (73–80%, n=580)19 Jul 2026: 75% (73–78%, n=1,195)26 Jul 2026: 75% (74–77%, n=2,210)2 Aug 2026: 77% (75–78%, n=3,245)9 Aug 2026: 77% (76–79%, n=3,720)16 Aug 2026: 78% (76–79%, n=4,390)23 Aug 2026: 78% (77–79%, n=4,680)30 Aug 2026: 78% (76–79%, n=5,045)6 Sept 2026: 77% (76–79%, n=5,475)13 Sept 2026: 77% (76–78%, n=5,765)20 Sept 2026: 77% (76–78%, n=6,120)27 Sept 2026: 76% (75–77%, n=6,470)4 Oct 2026: 76% (75–77%, n=6,720)11 Oct 2026: 76% (75–77%, n=7,065)18 Oct 2026: 76% (75–77%, n=7,465)25 Oct 2026: 77% (76–78%, n=7,670)1 Nov 2026: 77% (76–78%, n=8,075)

Shaded band: 95% Wilson interval. Dashed rules: content changes. Missing observations remain gaps.

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table
ThroughGreen rateProjectsContent change
5 Jul 2026hidden: too few projects––
12 Jul 202676% (73–80%, n=580)845–
19 Jul 202675% (73–78%, n=1,195)1,725–
26 Jul 202675% (74–77%, n=2,210)3,185–
2 Aug 202677% (75–78%, n=3,245)4,755–
9 Aug 202677% (76–79%, n=3,720)5,475–
16 Aug 202678% (76–79%, n=4,390)6,490–
23 Aug 202678% (77–79%, n=4,680)6,945–
30 Aug 202678% (76–79%, n=5,045)7,390–
6 Sept 202677% (76–79%, n=5,475)7,950–
13 Sept 202677% (76–78%, n=5,765)8,350–
20 Sept 202677% (76–78%, n=6,120)8,905–
27 Sept 202676% (75–77%, n=6,470)9,445–
4 Oct 202676% (75–77%, n=6,720)9,835–
11 Oct 202676% (75–77%, n=7,065)10,365–
18 Oct 202676% (75–77%, n=7,465)10,905–
25 Oct 202677% (76–78%, n=7,670)11,210–
1 Nov 202677% (76–78%, n=8,075)11,800–

Weekly projects by preset

Non-overlapping seven-day project counts, grouped by the preset used to start the project.

Jul 1Oct 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jul 1Oct 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jul 1Oct 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jul 1Oct 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
Jun 1Jul 1Aug 1Sep 1Oct 1Nov 101k2k3kdefault · 12 Jul 2026: 560sandbox · 12 Jul 2026: 285default · 19 Jul 2026: 560sandbox · 19 Jul 2026: 320default · 26 Jul 2026: 935sandbox · 26 Jul 2026: 520default · 2 Aug 2026: 1,035sandbox · 2 Aug 2026: 535default · 9 Aug 2026: 1,050sandbox · 9 Aug 2026: 520default · 16 Aug 2026: 1,220sandbox · 16 Aug 2026: 675default · 23 Aug 2026: 1,235sandbox · 23 Aug 2026: 670default · 30 Aug 2026: 1,315sandbox · 30 Aug 2026: 705default · 6 Sept 2026: 1,350sandbox · 6 Sept 2026: 780default · 13 Sept 2026: 1,475sandbox · 13 Sept 2026: 820default · 20 Sept 2026: 1,665sandbox · 20 Sept 2026: 800default · 27 Sept 2026: 1,695sandbox · 27 Sept 2026: 865default · 4 Oct 2026: 1,615sandbox · 4 Oct 2026: 905default · 11 Oct 2026: 1,840sandbox · 11 Oct 2026: 985default · 18 Oct 2026: 1,875sandbox · 18 Oct 2026: 1,130default · 25 Oct 2026: 1,830sandbox · 25 Oct 2026: 1,030default · 1 Nov 2026: 2,010sandbox · 1 Nov 2026: 1,100
  • default
  • sandbox

Stacks projects per UTC week through 4 Nov 2026. Published preset counts only; hidden cells are not zero.

Data table
Week endingPresetProjects
5 Jul 2026default–
12 Jul 2026default560
19 Jul 2026default560
26 Jul 2026default935
2 Aug 2026default1,035
9 Aug 2026default1,050
16 Aug 2026default1,220
23 Aug 2026default1,235
30 Aug 2026default1,315
6 Sept 2026default1,350
13 Sept 2026default1,475
20 Sept 2026default1,665
27 Sept 2026default1,695
4 Oct 2026default1,615
11 Oct 2026default1,840
18 Oct 2026default1,875
25 Oct 2026default1,830
1 Nov 2026default2,010
5 Jul 2026sandbox–
12 Jul 2026sandbox285
19 Jul 2026sandbox320
26 Jul 2026sandbox520
2 Aug 2026sandbox535
9 Aug 2026sandbox520
16 Aug 2026sandbox675
23 Aug 2026sandbox670
30 Aug 2026sandbox705
6 Sept 2026sandbox780
13 Sept 2026sandbox820
20 Sept 2026sandbox800
27 Sept 2026sandbox865
4 Oct 2026sandbox905
11 Oct 2026sandbox985
18 Oct 2026sandbox1,130
25 Oct 2026sandbox1,030
1 Nov 2026sandbox1,100

By preset

Green verify outcomes by the preset chosen at scaffold time.

default

75%74–76%, n=4,720

sandbox

80%78–81%, n=2,690

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table
NameGreen rateProjects
default75% (74–76%, n=4,720)6,925
sandbox80% (78–81%, n=2,690)3,925

By agent

Within this stack, listed alphabetically. These are project outcomes, not an agent ranking.

claude

77%76–79%, n=4,070

codex

76%74–78%, n=1,865

cursor

76%73–79%, n=780

none

80%74–85%, n=210

opencode

72%67–77%, n=350

other

80%73–86%, n=135

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table
NameGreen rateProjects
claude77% (76–79%, n=4,070)5,945
codex76% (74–78%, n=1,865)2,765
cursor76% (73–79%, n=780)1,125
none80% (74–85%, n=210)305
opencode72% (67–77%, n=350)505
other80% (73–86%, n=135)205

Time to green

Published time summaries on a shared minutes scale. First passing test is a median; 75% reached green by the 75th percentile.

02030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
02030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
0102030MinutesFirst passing testMedian to green75th percentileFirst passing test: 14 minutesMedian to green: 23 minutes75th percentile: 31 minutes14 min23 min31 min
Verify runs to green
1

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table
MeasureTime / runs
Median to green23 minutes
75th percentile31 minutes
First passing test14 minutes
Verify runs to green1

Where it breaks

A run can fail more than one step. Environment failures are shown separately.

test29%
lint13%
consumer8%
readme-filled7%
vet7%
api-check7%
fuzz7%
tidy7%
install7%
fmt-check7%
Environment blocked0%

Share of failed runs before first green. Environment blocked describes the machine, not the stack.

Data table
StepShare
readme-filled7%
test29%
vet7%
lint13%
api-check7%
fuzz7%
tidy7%
install7%
consumer8%
fmt-check7%
Environment blocked0%

What people change

Defaults people keep, and optional fragments they choose to attach.

Default, kept rate

agent-ops92%
git-hooks92%
ci-github92%

Optional, attach rate

rr17%
ce-plugin17%

Share of the window's 10,850 projects. Kept rate is 1 minus the without rate.

Data table
FragmentMeasureShare
agent-opsKept92%
git-hooksKept92%
ci-githubKept92%
rrAttached17%
ce-pluginAttached17%
By composition 29 fingerprints

Each row is a distinct fragment composition, with its own sample and content history.

CompositionGreen rateSeenChange in life
defaults + rr − agent-ops − git-hooks · 1a3fcbd2hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − agent-ops − ci-github · 1fcfe9cchidden: too few projects2 Aug 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − ci-github − git-hooks · 23de4055hidden: too few projects23 Aug 2026 – 1 Nov 2026None
defaults + rr − ci-github − git-hooks · 2c314ca5hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults − agent-ops − git-hooks · 2f15e63bhidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − git-hooks · 30be0667hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin · 38189bb278% (75–80%, n=1,045)12 Jul 2026 – 1 Nov 2026None
defaults + rr − agent-ops · 3cf6c0f6hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + rr − agent-ops − ci-github · 3d5a7616hidden: too few projects2 Aug 2026 – 1 Nov 2026None
defaults − ci-github · 44933553hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − agent-ops · 4acd591bhidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults − agent-ops − ci-github − git-hooks · 4bbe1c10hidden: too few projects9 Aug 2026 – 1 Nov 2026None
defaults + rr − ci-github · 5930a4d4hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − git-hooks · 6067fc6dhidden: too few projects26 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − ci-github − git-hooks · 63d5d19dhidden: too few projects19 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − ci-github · 6fb7b86dhidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults − agent-ops − ci-github · 747af052hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr · 88e82e7477% (71–82%, n=225)12 Jul 2026 – 1 Nov 2026None
defaults + rr · 99d54efa77% (74–79%, n=1,055)12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − agent-ops − git-hooks · 9f63ad97hidden: too few projects2 Aug 2026 – 1 Nov 2026None
defaults · ae66b67f77% (75–78%, n=5,085)12 Jul 2026 – 1 Nov 2026None
defaults + rr − git-hooks · b6e03045hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − agent-ops − git-hooks · b989acbchidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − agent-ops · bc977e1fhidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin − ci-github · c5a3450ahidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults − ci-github − git-hooks · d3e688f3hidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults + ce-plugin + rr − agent-ops − ci-github · e4eb6a50hidden: too few projects13 Sept 2026 – 1 Nov 2026None
defaults − agent-ops · f1fab97dhidden: too few projects12 Jul 2026 – 1 Nov 2026None
defaults − git-hooks · f5aadbabhidden: too few projects12 Jul 2026 – 1 Nov 2026None

Computed 5 Nov 2026, through 4 Nov 2026. Numbers describe stacks projects, not the ecosystem.