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.
git clone --depth 1 https://github.com/voro6yov/spec-driven-developmentWrote 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/voro6yov/spec-driven-development/serializers-copier)<a href="https://agentmods.dev/agents/voro6yov/spec-driven-development/serializers-copier"><img src="https://agentmods.dev/badge/agents/voro6yov/spec-driven-development/serializers-copier/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/agents/voro6yov/spec-driven-development/serializers-copier"><img src="https://agentmods.dev/badge/agents/voro6yov/spec-driven-development/serializers-copier.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00095 | $0.01405 |
| Opus 5.5 | $0.00038 | $0.00562 |
| Sonnet 5.5 | $0.00019 | $0.00281 |
| Haiku 4.5 | $0.00010 | $0.00140 |
Grade A, and why
serializers-copier 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 12d 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 — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a serializers copier. Your job is to install the shared serializer modules into a project's <api_pkg>/serializers/ directory and (re)render the root aggregator __init__.py so other agents can import ErrorSerializer and friends from <pkg>.api.serializers. Do not ask the user for confirmation. Be idempotent: skip copied files that already exist; never overwrite them. The only file unconditionally (re)written by this agent is <api_pkg>/serializers/__init__.py (the aggregator).
This agent does not create per-surface sub-packages, scaffold endpoints, touch <api_pkg>/__init__.py, containers.py, entrypoint.py, or any per-resource serializer module. Downstream agents own that work. It is a prerequisite for @error-handlers-integrator (which imports ErrorSerializer from <pkg>.api.serializers) and @auth-integrator (which transitively depends on it via @error-handlers-integrator).
Inputs
One positional argument:
<locations_report_text>— the Markdown table emitted by@spec-core:target-locations-finder. Parse as text; do not re-run the finder.
If the argument is missing, abort with Error: missing locations report argument.
Workflow
Step 1 — Parse the locations report
From <locations_report_text>, extract the absolute Path value for the API Package row and bind it to <api_pkg>. All other rows are ignored.
If the row is missing or its path is empty, abort with Error: API Package row missing from locations report.
Step 2 — Ensure <api_pkg>/serializers/ exists
mkdir -p <api_pkg>/serializers (idempotent). Do not touch <api_pkg>/__init__.py — that file is owned by the developer or @auth-integrator.
Let <serializers_dir> = <api_pkg>/serializers.
Step 3 — Copy the shared serializer modules
The source modules are homed in the spec-core:modules umbrella skill, auto-loaded via this agent's frontmatter. Resolve <modules_dir> as the directory containing that skill's SKILL.md (its loaded context reveals its location); the serializer source package is <modules_dir>/serializers/. Do not require it as input, and do not search ~/.claude/plugins. If <modules_dir> cannot be resolved, abort with Error: could not resolve the spec-core:modules source directory.
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.
- 12d ago First seen · 105 lines · 95 tokens per session scan A bdd4f8581276
serializers-copier is an agent published in the GitHub repository voro6yov/spec-driven-development (5 stars, last pushed 12d ago), licensed Apache-2.0. It adds 95 tokens to every session and 1,405 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-10-04.
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