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/ai-driven-dev/framework/capabilitynpx skills add ai-driven-dev/framework --skill capabilitygit clone --depth 1 https://github.com/ai-driven-dev/frameworkWhat 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 | $0.00122 | $0.00655 |
| Opus 5 | $0.00061 | $0.00328 |
| Sonnet 5 | $0.00024 | $0.00131 |
| Haiku 4.5 | $0.00012 | $0.00065 |
Grade A, and why
capability 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 — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Capability
Builds a capability class that encapsulates one tool runtime behavior and its corresponding
Has* interface in domain/tools/contracts.ts. Each capability class is instantiated in
exactly one AiTool<C> file; the Has* interface declares the typed field in the C parameter.
Available actions
| # | Action | Role | Input |
|---|---|---|---|
| 01 | define-has-interface |
Declare the Has* interface in domain/tools/contracts.ts | capability name + field type |
| 02 | write-capability-class |
Write the capability class in domain/capabilities/ | Has* interface from 01 |
| 03 | wire-into-tool |
Add the capability to an AiTool definition | capability class from 02 |
| 04 | test |
Write unit tests covering constructor params and public API | completed capability from 02 |
Default flow
01 → 02 → 03 → 04
Skip 01 when the Has* interface already exists in contracts.ts and only the class needs updating.
Skip 03 when the new capability is not yet needed by any existing tool (e.g. adding it speculatively).
Transversal rules
Has*interface lives indomain/tools/contracts.ts; the field type is the capability class.- Capability class file lives in
domain/capabilities/<kebab-name>-capability.ts; one class per file. - Capability class name ends in
Capability(e.g.WidgetsCapability). - Constructor accepts a single params object; no positional arguments.
- All public fields are
readonly; no setters. - Throw
CapabilityConfigError(fromdomain/errors.ts) on invalid constructor params. - Capability presence guard uses the
inoperator:"widgets" in tool.capabilities— neverinstanceof. - Named export only; no default export.
- No
anytypes. .jsextensions on all relative imports.
What ships with it
7 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.
- yesterday First seen · 56 lines · 122 tokens per session scan A 6b7b3f0afbc3
capability is a skill published in the GitHub repository ai-driven-dev/framework (445 stars, last pushed 2d ago), licensed MIT. It adds 122 tokens to every session and 655 once invoked, about $0.0006 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.
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