Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/me2resh/apexyardnpx agentmods add skills/me2resh/apexyard/feature-diagramWrote 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/me2resh/apexyard/feature-diagram)<a href="https://agentmods.dev/skills/me2resh/apexyard/feature-diagram"><img src="https://agentmods.dev/badge/skills/me2resh/apexyard/feature-diagram/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/me2resh/apexyard/feature-diagram"><img src="https://agentmods.dev/badge/skills/me2resh/apexyard/feature-diagram.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 79 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium MCP Rug Pull · line 261 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 5.1 | $0.00026 | $0.03781 |
| Opus 5 | $0.00013 | $0.01891 |
| Sonnet 5 | $0.00005 | $0.00756 |
| Haiku 4.5 | $0.00003 | $0.00378 |
Grade A, and why
feature-diagram 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 9d 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 — 320 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/feature-diagram — Per-feature Mermaid Sub-graph
Reads the Feature Inventory at projects/<name>/feature-inventory.md (produced by /extract-features) and writes a per-feature Mermaid flowchart LR showing the HTTP routes, data models, async jobs, and UI screens that participate in one feature. Output: projects/<name>/features/<slug>.md (one file per feature).
This skill closes the gap left by the rest of the architecture-doc family:
| Skill | Slice |
|---|---|
/c4 |
Whole-system topology (L1 + L2) |
/dfd |
Whole-system data flows + trust boundaries |
/process |
One business process (BPMN control flow) |
/journey |
One feature, product-facing user flow (HTML modal-per-page) |
/feature-diagram (this skill) |
One feature, architectural slice (Mermaid flowchart) |
See AgDR-0035-per-feature-diagrams.md for the design rationale.
Path resolution
Read the per-project docs dir via portfolio_projects_dir from .claude/hooks/_lib-portfolio-paths.sh. Source the helper at the top of any bash block that touches that path:
source "$(git rev-parse --show-toplevel)/.claude/hooks/_lib-read-config.sh"
source "$(git rev-parse --show-toplevel)/.claude/hooks/_lib-portfolio-paths.sh"
projects_dir=$(portfolio_projects_dir)
Defaults match today's single-fork layout (./projects). Adopters in split-portfolio mode override the portfolio.{registry, projects_dir} keys in .claude/project-config.json — the helper resolves whichever mode they're in. See docs/multi-project.md.
Write targets (see me2resh/apexyard#373 + #443): paths documented as projects/<name>/X in this skill are canonical adopter-facing forms — implement them in bash as "${projects_dir}/<name>/X". Never construct from "${PWD}/projects/...", "$(git rev-parse --show-toplevel)/projects/...", or a literal ./projects/... — those break in split-portfolio v2 mode where projects_dir resolves to a sibling repo.
REQUIRED per-block preamble (see #443): Claude executes each bash block as a separate shell invocation. The projects_dir assignment from the Path resolution section above does NOT carry into later blocks. Every bash block that writes to a projects/<name>/X path MUST start with this three-line preamble so it's self-contained:
What ships with it
4 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.
- 9d ago First seen · 320 lines · 26 tokens per session scan A de64c6b51f3b
feature-diagram is a skill published in the GitHub repository me2resh/apexyard (498 stars, last pushed yesterday), licensed MIT. It adds 26 tokens to every session and 3,781 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.
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