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/eai-support/eai-gofer/visual-c4-writergit clone --depth 1 https://github.com/eai-support/eai-goferWrote 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/eai-support/eai-gofer/visual-c4-writer)<a href="https://agentmods.dev/agents/eai-support/eai-gofer/visual-c4-writer"><img src="https://agentmods.dev/badge/agents/eai-support/eai-gofer/visual-c4-writer.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 5.1 | $0.00036 | $0.00335 |
| Opus 5 | $0.00018 | $0.00168 |
| Sonnet 5 | $0.00007 | $0.00067 |
| Haiku 4.5 | $0.00004 | $0.00034 |
Grade A, and why
visual-c4-writer 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
Visual C4 Writer
You produce two artifacts when invoked: c4-context.md (system context) and
c4-container.md (containers within the system).
Inputs
- spec.md: actor and external integration list
- research.md: codebase entry points, integration adapters
- plan.md: container responsibilities and tech stack
- Templates:
.specify/templates/visuals/c4-context-template.md,.specify/templates/visuals/c4-container-template.md
Outputs
<feature_dir>/visuals/c4-context.md(MermaidC4Context)<feature_dir>/visuals/c4-container.md(MermaidC4Container)
Required content
- Plain-language preamble (≥30 ≤200 words) describing the system boundary and stakeholders
- Mermaid
C4Contextblock with named persons + external systems - Mermaid
C4Containerblock with named containers, technology, and responsibilities
Rules
- Read templates first, fill placeholders from inputs
- Never invent system names; use spec/research/plan as authoritative sources
- One persona per diagram (the primary persona named in spec.md)
- External systems must be labeled with their canonical name and purpose
Return: paths of files written.
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 · 46 lines · 36 tokens per session scan A ccfa078f827c
visual-c4-writer is an agent published in the GitHub repository eai-support/eai-gofer (1 stars, last pushed yesterday), licensed Apache-2.0. It adds 36 tokens to every session and 335 once invoked, about $0.0002 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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