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 skills/shafthq/shaft_engine/shaft-developernpx skills add ShaftHQ/SHAFT_ENGINE --skill shaft-developergit clone --depth 1 https://github.com/ShaftHQ/SHAFT_ENGINEWrote 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/skills/shafthq/shaft_engine/shaft-developer)<a href="https://agentmods.dev/skills/shafthq/shaft_engine/shaft-developer"><img src="https://agentmods.dev/badge/skills/shafthq/shaft_engine/shaft-developer.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 | $0.00028 | $0.00634 |
| Opus 5 | $0.00014 | $0.00317 |
| Sonnet 5 | $0.00006 | $0.00127 |
| Haiku 4.5 | $0.00003 | $0.00063 |
Grade A, and why
shaft-developer 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 21 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SHAFT Developer
Routing
- Lifecycle:
shaft-requirements-analysis,shaft-test-planning,shaft-test-case-design,shaft-test-data-design,shaft-test-environment,shaft-test-execution,shaft-test-monitoring,shaft-failure-analysis,shaft-flaky-test-analysis,shaft-defect-reporting,shaft-execution-reporting,shaft-stakeholder-reporting,shaft-accessibility-testing,shaft-nonfunctional-test-design - Implementation:
shaft-automated-test-authoring,shaft-page-objects,shaft-fluent-api,shaft-locator-design,shaft-web-actions,shaft-mobile-actions,shaft-api-testing,shaft-database-testing,shaft-assertions,shaft-guide-search,shaft-test-recording,shaft-recording-codegen,shaft-change-verification - Tools:
shaft-mcp,shaft-cli
Read the deterministic routing map, select the single
closest specialist for the current deliverable, and load only that skill. A
natural-language web, mobile, or API scenario whose output is generated test
code starts at shaft-test-recording, then returns here for
shaft-recording-codegen after the recording is persisted and replay-proven.
Return here only when the user asks for a distinct next deliverable. Never guess
SHAFT syntax, tool names, execution evidence, or product behavior.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 4d ago First seen · 21 lines · 28 tokens per session scan A 571c56f33c06
shaft-developer is a skill published in the GitHub repository ShaftHQ/SHAFT_ENGINE (407 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 634 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 skills, from other repositories
mirroir-onboard
Onboard a consumer web app to mirroir's .mirroir/ dotfile by EXPLORING the running app (chrome-devtools-mcp) — derive real selectors from the accessibility tree, exercise each surface's primary action, emit the .mirroir/ tree, and validate by LIVE REPLAY with a self-heal loop. Reject shallow "page renders" coverage.
eclipse-debug
Debug Java applications in Eclipse — set breakpoints, launch in debug mode, step through code, inspect stack traces, evaluate expressions, and hot-swap code changes.
eclipse-test
Run JUnit tests in Eclipse projects — all tests, by package, by class, or individual test methods. Also build Maven projects.
eclipse-run
Launch and stop Java applications in Eclipse. Run with program/VM arguments, capture stdout/stderr, or launch in background.
testing-assistant
Manages testing lifecycle including unit tests, integration tests, validation, and quality assurance.
eclipse-analyze
Analyze Java code using Eclipse JDT tools — type hierarchy, find references, call hierarchy, compilation errors, quick fixes, and import suggestions. Use this to understand code structure before making changes.