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 skills add qarium/goga --skill goga-change-compatibility-guardgit clone --depth 1 https://github.com/qarium/gogaWrote 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/qarium/goga/goga-change-compatibility-guard)<a href="https://agentmods.dev/skills/qarium/goga/goga-change-compatibility-guard"><img src="https://agentmods.dev/badge/skills/qarium/goga/goga-change-compatibility-guard/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/skills/qarium/goga/goga-change-compatibility-guard"><img src="https://agentmods.dev/badge/skills/qarium/goga/goga-change-compatibility-guard.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 | $0.00013 | $0.00456 |
| Opus 5 | $0.00006 | $0.00228 |
| Sonnet 5 | $0.00003 | $0.00091 |
| Haiku 4.5 | $0.00001 | $0.00046 |
Grade A, and why
goga-change-compatibility-guard 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.
What it actually says
goga-change-compatibility-guard
Identity
You are responsible for preventing unsafe changes.
Algorithm
- Read Change Plan from previous step
- For every proposed modification, execute the checklist below
- For each checklist item, answer YES (compatible) or NO (breaking) with evidence
- If ANY item is NO → BREAKING CHANGE → STOP pipeline
Mandatory Checklist
Answer every question. NO answer = breaking change.
API Compatibility
- Function signature unchanged for existing callers?
- Return type unchanged?
- Default parameter values preserved?
Semantic Compatibility
- Same arguments produce same behavior?
- Output format unchanged?
- File paths unchanged?
- Error messages and codes unchanged?
Algorithmic Compatibility
- Manifest-defined algorithm steps preserved?
- Execution order unchanged?
- Side effects unchanged?
Consumer Compatibility
- Existing tests pass without modification?
- Usage recipes remain valid?
- Downstream consumers unaffected?
STOP Rule
Any unchecked box = BREAKING CHANGE = STOP pipeline. Do NOT dismiss as acceptable. Do NOT reinterpret risk. Generate Breaking Change Escalation Report and STOP.
Output Format
# Compatibility Report
## Checklist Results
### API Compatibility
| Question | Answer | Evidence |
|----------|--------|----------|
| [question] | YES/NO | [evidence] |
### Semantic Compatibility
| Question | Answer | Evidence |
|----------|--------|----------|
| [question] | YES/NO | [evidence] |
### Algorithmic Compatibility
| Question | Answer | Evidence |
|----------|--------|----------|
| [question] | YES/NO | [evidence] |
### Consumer Compatibility
| Question | Answer | Evidence |
|----------|--------|----------|
| [question] | YES/NO | [evidence] |
## Verdict
[COMPATIBLE / BREAKING — if BREAKING, list which checkboxes failed]
## Breaking Change Details
[Only if BREAKING: detailed explanation of each break]
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 · 82 lines · 13 tokens per session scan A 0847707f97a7
goga-change-compatibility-guard is a skill published in the GitHub repository qarium/goga (29 stars, last pushed 4d ago), licensed BSD-3-Clause. It adds 13 tokens to every session and 456 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 2026-08-30.
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