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 agentmods add skills/posthog/posthog-foss/querying-local-postgresnpx skills add PostHog/posthog-foss --skill querying-local-postgresgit 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/querying-local-postgres)<a href="https://agentmods.dev/skills/posthog/posthog-foss/querying-local-postgres"><img src="https://agentmods.dev/badge/skills/posthog/posthog-foss/querying-local-postgres.svg" alt="Measured on agentmods" 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 | $0.00079 | $0.02560 |
| Opus 5 | $0.00039 | $0.01280 |
| Sonnet 5 | $0.00016 | $0.00512 |
| Haiku 4.5 | $0.00008 | $0.00256 |
Grade A, and why
querying-local-postgres 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 4d 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 — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Querying local Postgres (READ-ONLY) — PostHog repo
User's query: $ARGUMENTS
Scope: This repo uses PostgreSQL for app metadata (teams, projects, flags, Django models, etc.). Analytics event data lives in ClickHouse, not Postgres — use HogQL / ClickHouse tools for events-style questions unless the user explicitly wants Postgres.
When to use
- User asks to query the database, inspect tables, or run SQL against Postgres
- Debugging: Row-level checks (e.g. why a team/project/flag row looks wrong), migrations, constraints, duplicate keys
- Performance:
EXPLAIN/EXPLAIN (ANALYZE, …)on read-onlySELECTagainst Django or app tables
Instructions
- Strictly forbid mutations — See "Mutations strictly forbidden" below. If the user asks for any write or mutation, refuse and explain the skill is read-only.
- Translate the user's question into one or more read-only SQL statements.
- Show the SQL in a code block before running.
- Run using the command pattern below (always with
PGOPTIONS='-c default_transaction_read_only=on'to force a read-only connection). - Show results and give a brief interpretation (especially when used for debugging or plan review).
Mutations strictly forbidden
Do not run, suggest, or generate any of the following. Refuse and state that this skill is read-only.
- DML:
INSERT,UPDATE,DELETE,MERGE,TRUNCATE - DDL:
CREATE,DROP,ALTER,RENAME - Other writes:
COPY ... TO program,CALL(if it mutates),GRANT/REVOKE EXPLAIN ANALYZEon anything other than a read-onlySELECT(includingWITH … SELECT). Do not wrap DML inEXPLAIN ANALYZE— it would execute the write. The read-only connection below rejects writes, but the agent must not attempt this pattern.- Any statement that modifies data, schema, or roles
Allowed:
SELECT(includingWITH … SELECT)EXPLAIN…SELECT(estimate-only plan; no execution)EXPLAIN (ANALYZE, …) SELECT— executes theSELECTonce; use only for performance analysis. Must run on the read-only connection below.SHOW,SELECTfrom catalog views (pg_stat_*,information_schema, etc.) when read-only
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.
- 4d ago First seen · 167 lines · 79 tokens per session scan A 17720bc9cb17
querying-local-postgres is a skill published in the GitHub repository PostHog/posthog-foss (713 stars, last pushed today), licensed MIT. It adds 79 tokens to every session and 2,560 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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