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/static-var/keystone/implementationnpx skills add static-var/Keystone --skill implementationgit clone --depth 1 https://github.com/static-var/KeystoneWhat 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 | $0.00054 | $0.02968 |
| Opus 5 | $0.00027 | $0.01484 |
| Sonnet 5 | $0.00011 | $0.00594 |
| Haiku 4.5 | $0.00005 | $0.00297 |
Grade A, and why
implementation 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 yesterday.
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 — 276 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implementation
Core principle
Implementation changes through evidence, not vibes: isolate first, specify the next observable behavior, prove the test can fail, make the smallest correct change, then refactor without changing behavior.
Implementation is the mutation module. It may edit scoped project artifacts after the isolation gate passes, but it does not decide that work is shipped. Completion means "implemented with proof and handed to a change-review/shipping checkpoint," not finalized.
Load when
Use Implementation when a named software or digital-product initiative needs:
- a feature, screen, endpoint, command, migration, or integration implemented;
- a diagnosed fix applied;
- architecture, module boundaries, interfaces, or contracts changed;
- an approved plan from
task-creationexecuted; - independent implementation slices delegated when a subagent tool is available;
- supporting artifacts only within an already-active behavior-changing implementation: required project configuration, documentation, content, or scripts.
Entry fit
An explicit invocation selects the full Implementation behavior.
A Keystone handoff selects the full skill when a project change needs this mutation-and-proof contract.
For automatic entry, load the full skill when the prompt's subject is project-bound, the requested change alters executable software behavior, and this mutation-and-proof contract materially improves the change. The current directory alone does not establish project scope.
For automatic routing of a mechanical single-file configuration edit, one-off script, or other standalone small mutation that does not need project-specific context or proof gates, use the direct editing path and verify the requested result proportionately.
Not for
Do not use Implementation for:
- routing unclear work: use
context-survey - context-surveying unknowns without mutation: use
context-survey - shaping requirements or acceptance criteria: use
product-planning - decomposing large work before implementation: use
task-creation - diagnosing a failure whose cause is unknown: use
root-cause-analysis - reviewing completed changes: use
change-review - releasing, merging, publishing, or finalizing: use
shipping
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.
- yesterday First seen · 276 lines · 54 tokens per session scan A c43020d217e6
implementation is a skill published in the GitHub repository static-var/Keystone (4 stars, last pushed 1mo ago), licensed MIT. It adds 54 tokens to every session and 2,968 once invoked, about $0.0003 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 2026-08-31.
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workflows
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investigation-first
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