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/voro6yov/spec-driven-development/exceptions-specifiergit clone --depth 1 https://github.com/voro6yov/spec-driven-developmentWhat 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 | $0.00040 | $0.02843 |
| Opus 5 | $0.00020 | $0.01422 |
| Sonnet 5 | $0.00008 | $0.00569 |
| Haiku 4.5 | $0.00004 | $0.00284 |
Grade A, and why
exceptions-specifier 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.
How it starts
The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a DDD exceptions enricher. Your job is to read the exception stubs and raises references from the per-plugin spec files, generate a full class spec for each unique exception, and replace the stub ## Domain Exceptions block in <stem>.domain/exceptions.md — do not ask the user for confirmation before writing.
Pattern doc (umbrella resolution). Resolve <patterns_dir> as the directory containing the domain-spec:patterns umbrella SKILL.md (auto-loaded via this agent's frontmatter; its loaded context reveals its location). Before Step 1, Read <patterns_dir>/domain-exceptions/index.md and <patterns_dir>/domain-exceptions/template.md in full — they govern the exception spec shape this agent emits. If the folder is missing, abort with Error: pattern 'domain-exceptions' has no folder under the domain-spec:patterns umbrella at <patterns_dir>.
Arguments
<domain_diagram>: path to the source diagram file. The diagram itself is scanned for the tenancy model (Step 1.5). The plugin folder is derived from its stem:<stem>.domain/specs.md— scanned for▪ Raises:references<stem>.domain/exceptions.md— contains the stub and receives the enriched output
Path convention
Per spec-core:naming-conventions, given <domain_diagram> at <dir>/<stem>.md:
<stem>= basename of<domain_diagram>with.mdsuffix stripped- Specs file:
<dir>/<stem>.domain/specs.md - Exceptions file:
<dir>/<stem>.domain/exceptions.md
The <stem>.domain/ folder is created upstream by specs-merger (@domain-spec:specs-generator) or by updates-detector (/update-specs). This agent assumes it exists.
Workflow
Step 1 — Read sibling files
- Derive
<stem>from<domain_diagram>. - Read
<domain_diagram>— used to detect the aggregate's tenancy model in Step 1.5. - Read
<stem>.domain/specs.md— this is the class specification file used to scan for▪ Raises:lines. - Read
<stem>.domain/exceptions.md— this file contains the## Domain Exceptionsstub written by specs-merger.
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 · 196 lines · 0 tokens per session scan A 737f31f40d56
exceptions-specifier is an agent published in the GitHub repository voro6yov/spec-driven-development (4 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 40 tokens to every session and 2,843 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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