Weekly Engineering Retro
garrytan/gstack
Builds a weekly engineering retrospective from git history: commit counts, per-person contributions, work patterns and code quality numbers over a chosen window.
Post-completion factory improvement analysis. An agent skill from sandgardenhq/sgai.
Install Retrospective
$ npx skills add sandgardenhq/sgai --skill retrospective -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sandgardenhq/sgai retrospective --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .claude/skills/retrospective && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .claude/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospectiveType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add sandgardenhq/sgai --skill retrospective -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sandgardenhq/sgai retrospective --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .agents/skills/retrospective && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .agents/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sandgardenhq/sgai --skill retrospective -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sandgardenhq/sgai retrospective --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .cursor/skills/retrospective && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .cursor/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/sandgardenhq/sgai.git --path cmd/sgai/skel/.sgai/skills/retrospective--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add sandgardenhq/sgai --skill retrospective -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sandgardenhq/sgai retrospective --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .gemini/skills/retrospective && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .gemini/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install sandgardenhq/sgai retrospectiveInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add sandgardenhq/sgai --skill retrospective -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .github/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .github/skills/retrospective && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .github/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add sandgardenhq/sgai --skill retrospective -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sandgardenhq/sgai retrospective --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sandgardenhq/sgai.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cmd/sgai/skel/.sgai/skills/retrospective .opencode/skills/retrospective && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "retrospective" agent skill from https://github.com/sandgardenhq/sgai/tree/main/cmd/sgai/skel/.sgai/skills/retrospective into .opencode/skills/retrospective/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "retrospective", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
retrospective- GitHub stars
- 137
- Token cost
- ~7.7k tokens
- SKILL.md length
- 3,482 words
- Files
- 1
- Skills in repo
- 53
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Post-completion factory improvement analysis. An agent skill from sandgardenhq/sgai.
- Works in 9 steps: Artifact Discovery → 5: Mandatory Analysis Log → Pattern Analysis → …
- The retrospective agent starts its post-completion phase
- SKILL.md covers Overview, When to Use, IMPORTANT: Understanding… and SGAI_NOTES.md: Early and…, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Retrospective is an agent skill from sandgardenhq/sgai. Post-completion factory improvement analysis. Guides the retrospective agent through artifact discovery, pattern analysis, suggestion generation, and presenting proposed changes for approval. Use when the retrospective agent starts its post-completion phase.
Its SKILL.md is about 7.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Product & Project Management, covering Retrospectives. The repository describes itself as: Sandgarden AI Software Factory.
When your agent uses it
- The retrospective agent starts its post-completion phase
- Tasks that involve Retrospectives
Example prompts
- “/retrospective”
Workflow steps
9 steps, taken from the step headings in SKILL.md.
- Artifact Discovery
- 5: Mandatory Analysis Log
- Pattern Analysis
- 5: AGENTS.md Health Analysis
- Generate Suggestions
- Prioritize and Group
- Present Changes for Approval
- Apply Approved Changes
- Completion
What it can do on your machine
Read from SKILL.md and the folder at commit 9efbb7b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Retrospective loads about 7.7k tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 3,482 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 3,482 words (~7,726 tokens).
“This skill guides the retrospective agent through analyzing a completed session and producing actionable improvements to the factory. The goal is to make the factory better over time by examining what happened, identifying patterns, and proposing concrete changes to skills…”
- name
- retrospective
Files
Just SKILL.md in cmd/sgai/skel/.sgai/skills/retrospective of sandgardenhq/sgai.
Open the folder on GitHubat commit 9efbb7b
Compare with similar skills
Retrospective next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Retrospective this skillsandgardenhq/sgai | 137 | — | ~7.7k | Automated safety check: Pass | Custom licence | |
| Weekly Engineering Retrogarrytan/gstack | 136k | — | ~2.4k | Automated safety check: Pass | MIT | |
| Dough Execute Planterryyin/lizard | 2.5k | — | ~4.3k | Automated safety check: Pass | Custom licence | |
| Oral Paper SkillAdkid-Zephyr/oral-paper-skill | 357 | — | ~1.9k | Automated safety check: Pass | None | |
| Deck Retroasheshgoplani/agent-deck | 1.1k | — | ~1.8k | Automated safety check: Pass | MIT | |
| Dough Execution Retrospectiveterryyin/lizard | 2.5k | — | ~4k | Automated safety check: Pass | Custom licence |
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Related
Categories
Questions about Retrospective
What does Retrospective do?
Post-completion factory improvement analysis. An agent skill from sandgardenhq/sgai. Retrospective is an agent skill from sandgardenhq/sgai. Post-completion factory improvement analysis.
When should I use Retrospective?
Retrospective fits situations like: the retrospective agent starts its post-completion phase; tasks that involve Retrospectives.
How do I install Retrospective in Claude Code?
Run `npx skills add sandgardenhq/sgai --skill retrospective -a claude-code`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/retrospective in sandgardenhq/sgai) into .claude/skills/retrospective in your project. Claude Code loads it when a task matches its description.
How do I install Retrospective in Codex?
Run `npx skills add sandgardenhq/sgai --skill retrospective -a codex`. Or copy the skill folder (cmd/sgai/skel/.sgai/skills/retrospective in sandgardenhq/sgai) into .agents/skills/retrospective in your project. Codex loads it when a task matches its description.
Can I use Retrospective in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sandgardenhq/sgai --skill retrospective -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/retrospective, .gemini/skills/retrospective, .github/skills/retrospective and .opencode/skills/retrospective in your project.
What does Retrospective need to run?
SKILL.md names no scripts, command-line tools or credentials: Retrospective is instructions for the agent only.
Does Retrospective access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Retrospective safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Retrospective use?
Retrospective has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Retrospective use?
About 7.7k tokens (SKILL.md is roughly 31k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Retrospective?
Skills that share tags, products or a category with Retrospective: Weekly Engineering Retro (garrytan/gstack, 136k stars), Dough Execute Plan (terryyin/lizard, 2.5k stars), Oral Paper Skill (Adkid-Zephyr/oral-paper-skill, 357 stars) and Deck Retro (asheshgoplani/agent-deck, 1.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Retrospective?
sandgardenhq (a GitHub organization) maintains it in sandgardenhq/sgai, which has 137 GitHub stars. The repository holds 53 skills in this directory. The repository was last updated on September 21, 2026.
Source: sandgardenhq/sgai on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.