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 skills/melodic-software/claude-code-plugins/deltanpx skills add melodic-software/claude-code-plugins --skill deltagit clone --depth 1 https://github.com/melodic-software/claude-code-pluginsWrote 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/melodic-software/claude-code-plugins/delta)<a href="https://agentmods.dev/skills/melodic-software/claude-code-plugins/delta"><img src="https://agentmods.dev/badge/skills/melodic-software/claude-code-plugins/delta.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 | $0.00152 | $0.01787 |
| Opus 5 | $0.00076 | $0.00894 |
| Sonnet 5 | $0.00030 | $0.00357 |
| Haiku 4.5 | $0.00015 | $0.00179 |
Grade A, and why
delta scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pre-computed context
!"${CLAUDE_PLUGIN_ROOT}/scripts/precompute.sh" audit 2>/dev/null || echo "- Orientation unavailable"
Purpose
A full audit is worth running rarely and reading carefully. This is the lane for the other times: it answers what moved, so a repeat run costs attention proportional to actual change.
The failure it exists to prevent is a specific one. An audit re-run that re-presents the same forty findings the operator already worked through trains them to skim, and a skimmed report is how a bad migration gets approved. Reporting only movement keeps the signal-to-noise ratio survivable on a cadence.
Read these first
| Read | For |
|---|---|
../../context/findings-artifact.md |
Status vocabulary, re-run merge semantics, where the artifact lives |
../../context/routing-rubric.md |
Only when a genuinely new candidate needs classifying |
This skill does not restate the merge semantics. The artifact contract owns them, and a second statement is a second thing to drift.
What counts as movement
Five shapes, in report order. Everything else is suppressed.
| Shape | Trigger | Why it matters |
|---|---|---|
new |
A candidate with no prior finding | The only shape that needs fresh classification |
changed |
A finding whose source content changed since the last run | Its line range is stale; realign would excise the wrong text |
broken-glob |
A rule glob that resolved before and does not now | The rule stopped firing, silently, and nobody was told |
index-drift |
The index no longer matches the rules on disk | Deferred surfaces became unreachable from subagents |
stale |
A finding whose source no longer exists | The content was moved or deleted outside this plugin |
broken-glob is the shape that most justifies running this on a cadence. A glob breaks when the
code it described gets renamed or moved, an ordinary refactor, nowhere near the rules tree, with no
signal at the time. Nothing else in the plugin notices between check runs.
What ships with it
1 file 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.
- yesterday First seen · 130 lines · 152 tokens per session scan A f7562037b376
delta is a skill published in the GitHub repository melodic-software/claude-code-plugins (14 stars, last pushed yesterday), licensed MIT. It adds 152 tokens to every session and 1,787 once invoked, about $0.0008 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 2026-09-03.
Other skills, from other repositories
phpunit-migration-test-reviewing
Internal sub-skill. Do not auto-activate. Use only when explicitly invoked by name by another skill or agent.
structuring-documentation
Use when writing, editing, auditing, splitting, or measuring Markdown documentation surfaces — README.md, AGENTS.md, CLAUDE.md, and docs/ siblings. Triggers include "is this doc too long", "split this README", "measure the docs", "where does this documentation belong", "audit the documentation", and any request to…
phpunit-integration-test-generation
Use this skill when the user asks to generate, write, or create integration tests for a Shopware 6 source class whose contract requires wired-up code — phrases like "generate integration tests for X", "write an integration test for this controller", "test this indexer", "create an integration test for the message…
phpunit-unit-test-writing
Use this skill when the user asks to write, generate, create, or add PHPUnit unit tests for a Shopware 6 source class — phrases like "write unit tests for X", "generate tests for ClassName", "create PHPUnit tests", "add test coverage", "test this class", "cover this with tests", "I need tests for", "unit test this"…
phpunit-migration-test-generation
Use this skill when the user asks to generate, write, or create migration tests for a Shopware 6 migration class — phrases like "generate migration tests", "write a migration test", "create migration test", "test this migration", "test Migration1234Foo". Analyzes the source migration's SQL operations to pick an…
phpunit-test-reconciling
Internal sub-skill. Do not auto-activate. Use only when explicitly invoked by name by another skill or agent.