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 jkaninda/okapi-skills --skill validationgit clone --depth 1 https://github.com/jkaninda/okapi-skillsWrote 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/jkaninda/okapi-skills/validation)<a href="https://agentmods.dev/skills/jkaninda/okapi-skills/validation"><img src="https://agentmods.dev/badge/skills/jkaninda/okapi-skills/validation/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/jkaninda/okapi-skills/validation"><img src="https://agentmods.dev/badge/skills/jkaninda/okapi-skills/validation.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 | $0.00000 | $0.02387 |
| Opus 5.5 | $0.00000 | $0.00955 |
| Sonnet 5.5 | $0.00000 | $0.00477 |
| Haiku 4.5 | $0.00000 | $0.00239 |
Grade A, and why
validation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 242 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Okapi Validation
Validation is declarative: struct tags drive both runtime enforcement and OpenAPI schema generation. Validation runs automatically inside c.Bind and inside the typed handler wrappers (okapi.Handle, okapi.H, okapi.HandleIO, okapi.HandleO).
For where values come from (JSON body, query, path, header, cookie, form), see the request_binding/ skill.
Constraint Tags
| Tag | Applies to | Description |
|---|---|---|
required:"true" |
any | Field must be present and non-zero |
default:"v" |
any | Assigned when the field is missing/empty |
min:"5" |
number | ≥ 5 |
max:"100" |
number | ≤ 100 |
exclusiveMin:"0" |
number | > 0 |
exclusiveMax:"100" |
number | < 100 |
multipleOf:"5" |
number | Divisible by 5 |
minLength:"3" |
string | Length ≥ 3 |
maxLength:"50" |
string | Length ≤ 50 |
pattern:"^[A-Z]+$" |
string / []string |
Regular expression |
format:"email" |
string / []string |
Format validation (table below) |
enum:"a,b,c" |
string / []string |
One of the listed values |
const:"active" |
string / []string |
Must equal a fixed value (JSON Schema const in OAS 3.1) |
contains:"@" |
string / []string |
Must contain the substring |
notContains:" " |
string / []string |
Must not contain the substring |
minItems:"2" |
slice | At least 2 items |
maxItems:"5" |
slice | At most 5 items |
uniqueItems:"true" |
slice | No duplicates |
minProperties:"1" |
map | At least 1 entry |
maxProperties:"10" |
map | At most 10 entries |
Slices:
enum,const,format,pattern,contains, andnotContainsapply to each element of a[]string. Failures are reported per index —element [2]: ....Empty values: those same tags skip empty strings. Combine with
required:"true"to also enforce presence.
Conditional Required Tags
Requiredness that depends on sibling fields in the same struct. Referenced fields use their Go field name, not the JSON name.
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.
- 1mo ago First seen · 242 lines · 0 tokens per session scan A bd8dab55ed33
validation is a skill published in the GitHub repository jkaninda/okapi-skills (3 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,387 tokens. 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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