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 PostHog/posthog-foss --skill creating-an-endpointgit clone --depth 1 https://github.com/PostHog/posthog-fossWrote 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/posthog/posthog-foss/creating-an-endpoint)<a href="https://agentmods.dev/skills/posthog/posthog-foss/creating-an-endpoint"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/creating-an-endpoint/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/posthog/posthog-foss/creating-an-endpoint"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/creating-an-endpoint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 103 Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.Fix: Remove jailbreak framing that nullifies safety policies or restrictions. Skill content must not instruct the agent to ignore its guidelines or operate without guardrails.
- high Prompt Injection · line 103 This pattern attempts to override system instructions or ignore safety constraints. Without LLM analysis, manual review is recommended.Fix: Remove or rewrite any text that instructs the agent to ignore prompts, override safety rules, or trust unverified content. Ensure skill content cannot be injected to alter agent behavior.
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 | $0.00131 | $0.02607 |
| Opus 5 | $0.00066 | $0.01303 |
| Sonnet 5 | $0.00026 | $0.00521 |
| Haiku 4.5 | $0.00013 | $0.00261 |
Grade A, and why
creating-an-endpoint 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 7d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- creating-an-endpoint — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating an endpoint
This skill walks through creating a new endpoint with the right configuration. Endpoints expose saved HogQL or insight queries as callable HTTP routes — the configuration choices made at creation time determine cost, latency, and how callers integrate.
The materialisation deep-dive lives at references/materializing.md. Pull it in when the
materialisation decision is non-obvious.
When to use this skill
- "Create an endpoint for [query]"
- "Expose this insight as an API"
- "Help me turn this HogQL into a callable endpoint"
- A new caller (mobile app, customer-facing dashboard, downstream pipeline) needs PostHog data and the user is choosing how to deliver it
Decisions to make in order
1. Should this even be an endpoint?
Endpoints are right when:
- An external system (someone else's code) needs to call PostHog for data
- The query is stable — not exploratory analysis
- The shape is reusable — same query with different parameters
Endpoints are wrong when:
- An internal PostHog dashboard or insight needs the data — use the insight directly; an endpoint only adds an external API surface you don't need internally
- One-off, exploratory analysis — use the
execute-sqltool (or the SQL editor) directly
Heavy aggregation is not a reason to avoid an endpoint. Endpoints are themselves saved queries, and a heavy, frequently-called aggregation is often the best case for an endpoint with materialisation turned on.
If the user is unsure, ask what's calling the endpoint and what shape they expect.
2. Pick a name
Names are URL-safe (letters, numbers, hyphens, underscores), start with a letter, max 128 chars, must be unique within the project. Lean toward:
- Descriptive over generic —
weekly_active_users_by_orgovermetrics - Snake_case — matches how the name appears in code paths and URLs
- No version in the name — versions are managed by the endpoint itself
- No "endpoint" in the name — redundant
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.
- 7d ago First seen · 225 lines · 131 tokens per session scan A bc63e6db5588
creating-an-endpoint is a skill published in the GitHub repository PostHog/posthog-foss (715 stars, last pushed today), licensed MIT. It adds 131 tokens to every session and 2,607 once invoked, about $0.0007 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.
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