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 xobotyi/cc-foundry --skill otel-tracinggit clone --depth 1 https://github.com/xobotyi/cc-foundryWrote 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/xobotyi/cc-foundry/otel-tracing)<a href="https://agentmods.dev/skills/xobotyi/cc-foundry/otel-tracing"><img src="https://agentmods.dev/badge/skills/xobotyi/cc-foundry/otel-tracing/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/xobotyi/cc-foundry/otel-tracing"><img src="https://agentmods.dev/badge/skills/xobotyi/cc-foundry/otel-tracing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00048 | $0.02708 |
| Opus 5 | $0.00024 | $0.01354 |
| Sonnet 5 | $0.00010 | $0.00542 |
| Haiku 4.5 | $0.00005 | $0.00271 |
Grade A, and why
otel-tracing 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 9d 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 — 278 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OTel Tracing
Create spans for logical operations, propagate context across every boundary, use semantic conventions for attribute names. Every tracing decision — span granularity, attribute selection, sampling strategy — trades off cost against visibility.
References
- Spans — [
${CLAUDE_SKILL_DIR}/references/spans.md]: Span anatomy, root spans, lifetime code patterns - Span data — [
${CLAUDE_SKILL_DIR}/references/span-data.md]: Events format, links format, SDK limits table - Context propagation — [
${CLAUDE_SKILL_DIR}/references/context-propagation.md]: W3C header format, propagator selection, baggage details, security - Instrumentation — [
${CLAUDE_SKILL_DIR}/references/instrumentation.md]: Server/client/async code patterns, library rules, testing guidance - Sampling — [
${CLAUDE_SKILL_DIR}/references/sampling.md]: Head/tail/combined strategies, decision guide, sampler types - Semantic conventions — [
${CLAUDE_SKILL_DIR}/references/semantic-conventions.md]: HTTP/DB/messaging attribute lists, status mapping, general conventions - SDK components — [
${CLAUDE_SKILL_DIR}/references/sdk-components.md]: Resource config, env vars, Collector deployment, exporter types
Spans
A span represents one unit of work in a trace — an HTTP request handler, a database query, a message publish. Not every function call.
Span Naming
Name spans for the class of operation, not the instance. Low-cardinality names enable aggregation; high-cardinality names destroy it.
- Use the most general string that identifies a statistically interesting class
- Never embed high-cardinality values (IDs, emails, paths with IDs)
- HTTP:
{METHOD} {route}— server:GET /users/:id; client:GET - DB:
{operation} {table}—SELECT users,INSERT orders
| Name | Verdict |
|---|---|
get |
Too general |
get_account/42 |
Too specific — ID in name |
get_account |
Good |
GET /users/{userId} |
Good — route template |
POST /api/v2/orders/abc123 |
Bad — order ID in name |
What ships with it
8 files 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.
- 9d ago First seen · 278 lines · 48 tokens per session scan A e6732465a9a3
otel-tracing is a skill published in the GitHub repository xobotyi/cc-foundry (20 stars, last pushed 2d ago), licensed MIT. It adds 48 tokens to every session and 2,708 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 2026-08-30.
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