A command that creates or updates a GDLD architecture diagram from the current conversation. The diagram can represent systems, modules, connections, groups, data flows, and known problems.

Use it to document flows, sequences, dependencies, service architecture, design patterns, and gotchas, then validate or render the result.

It turns discussion about a system into a saved, checkable description of its structure and relationships.

diagram — Command by greppable

Install

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.

agentmods

npx agentmods add commands/greppable/greppable-cc-plugin/diagram

Clone the repo

git clone --depth 1 https://github.com/greppable/greppable-cc-plugin

Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 537 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00020	$0.00537
Opus 5	$0.00010	$0.00269
Sonnet 5	$0.00004	$0.00107
Haiku 4.5	$0.00002	$0.00054

Measured 2d ago against content hash 1dfaeca781b1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 2d 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.

commands/diagram.md · 57 lines

What it actually says

/greppable:diagram — Create/Update GDLD Diagram

Create or update a GDLD architecture diagram from current context.

Usage

/greppable:diagram [description of what to diagram]

Workflow

Analyze the subject: Identify what needs diagramming from the conversation context or provided description.
Choose diagram type: flow, sequence, architecture, dependency, or pattern.
Identify elements:
- Nodes (systems, modules, components)
- Edges (relationships, data flows, calls)
- Groups (logical containers)
- Gotchas (known issues, warnings)
Generate GDLD output following the spec in specs/GDLD-SPEC.md:

@diagram|id:{id}|type:{type}|purpose:{description}
@node|id:{n}|label:{label}|group:{group}
@edge|from:{source}|to:{target}|label:{description}|style:{style}
@group|id:{g}|label:{label}
@gotcha|severity:{1-3}|area:{area}|symptom:{symptom}|fix:{fix}

Validate: bash "${CLAUDE_PLUGIN_ROOT}/scripts/gdl-lint.sh" <output.gdld>
Render preview: bash "${CLAUDE_PLUGIN_ROOT}/scripts/gdld2mermaid.sh" <output.gdld>
Write to file: Save to docs/gdl/diagrams/<name>.gdld (or user-specified path).

Conversion Shortcut

Can also convert existing formats to diagrams:

.gdlc → .gdld: bash "${CLAUDE_PLUGIN_ROOT}/scripts/gdlc2gdld.sh" <file.gdlc>
.gdls → .gdld: bash "${CLAUDE_PLUGIN_ROOT}/scripts/gdls2gdld.sh" <file.gdls>
.gdlu → .gdld: bash "${CLAUDE_PLUGIN_ROOT}/scripts/gdlu2gdld.sh" <file.gdlu>

Examples

/greppable:diagram the authentication flow
/greppable:diagram architecture of the API layer
/greppable:diagram this module's dependency graph

Changes

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.

2d ago First seen · 57 lines · 20 tokens per session scan A 1dfaeca781b1

Subscribe to this mod's changes

diagram is a command published in the GitHub repository greppable/greppable-cc-plugin (3 stars, last pushed 4mo ago), licensed MIT. It adds 20 tokens to every session and 537 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 2026-08-31.

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