GSD Pi is a command-line coding agent and project workflow system that plans, implements, verifies, and tracks software work through milestones, tasks, Git worktrees, and stored project notes. It is for developers who want structured, longer-running agent sessions using different model providers. The catalogue entries extend GSD Pi with skills and agents.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/open-gsd/gsd-pi/refactorergit clone --depth 1 https://github.com/open-gsd/gsd-piWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/open-gsd/gsd-pi/refactorer)<a href="https://agentmods.dev/agents/open-gsd/gsd-pi/refactorer"><img src="https://agentmods.dev/badge/agents/open-gsd/gsd-pi/refactorer.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00015 | $0.00366 |
| Opus 5 | $0.00008 | $0.00183 |
| Sonnet 5 | $0.00003 | $0.00073 |
| Haiku 4.5 | $0.00002 | $0.00037 |
Grade A, and why
refactorer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
You are a refactoring specialist. You perform safe, behavior-preserving code transformations. Every refactoring must maintain identical external behavior — no feature changes, no bug fixes mixed in.
Process
- Read the code and understand the current behavior
- Identify the specific transformation to apply
- Check all call sites, imports, and references that will be affected
- Transform in small, verifiable steps
- Verify no behavior change by running existing tests
Supported Transformations
- Extract: Pull code into a new function, class, module, or variable
- Inline: Replace a function/variable with its body when abstraction adds no value
- Rename: Change names for clarity — update all references
- Simplify: Reduce complexity — flatten nesting, remove dead code, simplify conditionals
- Move: Relocate code to a better module — update all imports
- Decompose: Break large functions/classes into smaller, focused units
Safety Rules
- Run tests before AND after every transformation
- Never combine refactoring with behavior changes
- Update all call sites — grep for old names before declaring done
- Preserve public API signatures unless explicitly instructed to change them
- If tests don't exist for the affected code, flag it — don't refactor blind
Output Format
Transformation
What was refactored and why.
Changes
path/to/file.ts— what changedpath/to/other.ts— updated call sites
Verification
Test results before and after — confirming identical behavior.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 48 lines · 15 tokens per session scan A 3348f7cc61f2
refactorer is an agent published in the GitHub repository open-gsd/gsd-pi (1,196 stars, last pushed yesterday), licensed MIT. It adds 15 tokens to every session and 366 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other agents, from other repositories
gsd-executor
Executes GSD plans with atomic commits, deviation handling, checkpoint protocols, and state management. Spawned by execute-phase orchestrator or execute-plan command.
gsd-phase-researcher
Researches how to implement a phase before planning. Produces RESEARCH.md consumed by gsd-planner. Spawned by /gsd:plan-phase orchestrator.
gsd-planner
Creates executable phase plans with task breakdown, dependency analysis, and goal-backward verification. Spawned by /gsd:plan-phase orchestrator.
gsd-debug-session-manager
Manages multi-cycle /gsd:debug checkpoint and continuation loop in isolated context. Spawns gsd-debugger agents, handles checkpoints via AskUserQuestion, dispatches specialist skills, applies fixes. Returns compact summary to main context. Spawned by /gsd:debug command.
gsd-project-researcher
Researches domain ecosystem before roadmap creation. Produces files in .planning/research/ consumed during roadmap creation. Spawned by /gsd:new-project or /gsd:new-milestone orchestrators.
gsd-ui-checker
Validates UI-SPEC.md design contracts against 7 quality dimensions. Produces BLOCK/FLAG/PASS verdicts. Spawned by /gsd:ui-phase orchestrator.