Borrowing it
Nothing to install: this file belongs to PostHog/posthog-foss. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/PostHog/posthog-foss/master/.agents/skills/adding-personhog-rpc/SKILL.mdgit 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/adding-personhog-rpc)<a href="https://agentmods.dev/skills/posthog/posthog-foss/adding-personhog-rpc"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/adding-personhog-rpc.svg" alt="Measured on agentmods" 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 | $0.00088 | $0.01930 |
| Opus 5 | $0.00044 | $0.00965 |
| Sonnet 5 | $0.00018 | $0.00386 |
| Haiku 4.5 | $0.00009 | $0.00193 |
Grade A, and why
adding-personhog-rpc 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 8d 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 — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Adding a personhog RPC
This skill walks through adding a new RPC end-to-end: proto definition, code generation, Rust implementation, and client updates.
Before you start: eligibility check
Personhog serves person, distinct ID, group, group type mapping, cohort membership, and feature flag hash key override data. If the data being accessed doesn't live in one of these tables, this RPC doesn't belong in personhog:
| Table | Data category | Routing |
|---|---|---|
posthog_person |
PersonData | Reads: replica (eventual) or leader (strong). Writes: leader |
posthog_persondistinctid |
PersonData | Same as person |
posthog_group |
NonPersonData | All ops: replica |
posthog_grouptypemapping |
NonPersonData | All ops: replica |
posthog_cohortpeople |
NonPersonData | All ops: replica |
posthog_featureflaghashkeyoverride |
NonPersonData | All ops: replica |
posthog_personoverride |
PersonData | Reads/writes follow person routing |
posthog_personlessdistinctid |
PersonData | Same as person |
If the table is not listed above, stop — this data should not go through personhog.
Step 0: design the data access pattern
Before writing any proto, figure out the SQL query you need. Then validate it against the available indexes — see references/database-indexes.md.
Key questions:
- What table(s) does this query hit?
- Does the WHERE clause match an existing index? Every query must be an index scan, never a sequential scan.
- Is this a read or write? This determines routing (see table above).
- For reads: does the caller need strong consistency (primary pool) or is eventual (replica pool) acceptable?
- For batch lookups: is the batch within a single team or cross-team?
What ships with it
2 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.
- 8d ago First seen · 165 lines · 88 tokens per session scan A b52d43b08cc8
adding-personhog-rpc is a skill published in the GitHub repository PostHog/posthog-foss (714 stars, last pushed today), licensed MIT. It adds 88 tokens to every session and 1,930 once invoked, about $0.0004 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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