observability-plan

observability-plan is a skill for Claude Code, Codex from sananthanarayan/skilldrop. It costs 97 tokens per session (2,010 once invoked), scanned A, original, MIT.

A plan for observing a running service through user-focused measurements, logs, metrics, traces, and alerts. It defines service-level indicators and objectives, which measure whether users receive reliable service.

In plain words
What is it for?
Use it to define critical user journeys, reliability targets, error budgets, alert rules, and an appropriate split between metrics, logs, and traces.
Why use it?
It helps teams detect real user-impacting failures, decide which alerts need immediate action, and investigate problems without collecting uncontrolled data.

Skill for Claude CodeCodex

Part of the skilldrop plugin — 51 skills, 4 agents shipped together

Install

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.

agentmods
npx agentmods add skills/sananthanarayan/skilldrop/observability-plan
Any agent
npx skills add sananthanarayan/skilldrop --skill observability-plan
Clone the repo
git clone --depth 1 https://github.com/sananthanarayan/skilldrop

Made for: Claude Code, Codex.

Or install skilldrop, the plugin that ships this one along with the rest of its 51 skills, 4 agents.

Wrote 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.

agentmods badge for observability-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/sananthanarayan/skilldrop/observability-plan.svg)](https://agentmods.dev/skills/sananthanarayan/skilldrop/observability-plan)
Your own site
<a href="https://agentmods.dev/skills/sananthanarayan/skilldrop/observability-plan"><img src="https://agentmods.dev/badge/skills/sananthanarayan/skilldrop/observability-plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,010 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00097 $0.02010
Opus 5 $0.00048 $0.01005
Sonnet 5 $0.00019 $0.00402
Haiku 4.5 $0.00010 $0.00201

Measured 5d ago against content hash 714a090a036a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

observability-plan 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 5d 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.

skills/observability-plan/SKILL.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

observability-plan

Designs the telemetry that makes a service debuggable at 3am and detectable before users complain — SLOs measured from the user's experience, alerts that fire only when a human must act, and the three pillars each used for what they're good at. Expands the one-line observability requirement from nfr-spec into a full operating plan; upstream of incident-comms and postmortem-generator (you can't communicate or analyze an incident you couldn't detect). Distinct from success-metrics (business outcomes) — this is operational health.

How to respond

  1. Start from user journeys, not from the resource dashboard. The first artifact is the list of critical journeys ("log in", "place order", "load feed") — because an SLI measures what the user experiences, and CPU graphs measure what's easy. Ask at most 2 questions, spent on the most critical journey and what "down" means to a user there. Resource metrics (the golden signals) still get covered — but as saturation/cause signals, never as the SLO.

  2. Define SLIs as good-events / valid-events from the user's side (catalog in reference.md) — availability (success rate), latency (a threshold, measured at a percentile: "% of requests < 300ms"), and where relevant freshness, correctness, throughput. ✅ "SLI: proportion of checkout requests returning 2xx within 1s, measured at the load balancer" — ❌ "SLI: average CPU" (the user never feels your CPU). Latency SLIs are a threshold count, not an average — averages hide the tail that hurts.

  3. Set SLOs with an explicit error budget and window. Each SLI gets a target over a rolling window: "99.9% over 28 days." That target is the error budget (0.1% = ~40 min/28d) — the quantity that governs both alerting and how aggressively you ship. State the budget in human terms (minutes/month) and name the error-budget policy: what happens when it's spent (freeze risky releases, redirect to reliability) — an SLO with no policy is a number nobody defends. Pick targets honestly (99.9% is not free; see nfr-spec's down-for-an-hour calibration) — more nines is exponentially more cost.

Read the full file on GitHub · 71 lines

Files

What ships with it

5 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.

Changes

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.

  1. 5d ago First seen · 71 lines · 97 tokens per session scan A 714a090a036a

Subscribe to this mod's changes

observability-plan is a skill published in the GitHub repository sananthanarayan/skilldrop (2 stars, last pushed 21d ago), licensed MIT. It adds 97 tokens to every session and 2,010 once invoked, about $0.0005 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 2026-08-31.

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