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Official agent skill

Signals

by PostHog in PostHog/posthog

How to query the documentembeddings table for raw signal data using HogQL.

OfficialCustom licenceAuto-check passedAI & LLM Engineering

Install Signals

skills CLI
$ npx skills add PostHog/posthog --skill signals -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install PostHog/posthog signals --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/products/signals/skills/signals .claude/skills/signals && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
signals
GitHub stars
40k
Token cost
~4.3k tokens
SKILL.md length
1,509 words
Files
1
Skills in repo
252
Repo updated
First seen
Licence
Custom licence

At a glance

How to query the documentembeddings table for raw signal data using HogQL.

  • Works in 10 steps: Always use text-embedding-3-small-1536… → embedText() arguments must be string… → Always time-bound your queries. The… → …
  • You need to perform semantic search over signals
  • SKILL.md covers What Are Signals?, When to use this skill vs.…, Table and Column Reference and Mandatory Filters, plus 10 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Signals is an agent skill from PostHog/posthog, published by the product's own GitHub organization. How to query the documentembeddings table for raw signal data using HogQL. Use when you need to perform semantic search over signals, fetch every signal that contributed to a specific report, or list signal types. For browsing the curated report layer (the Inbox) — listing reports, filtering by status/source, drilling into a single report by ID — use the inbox-exploration skill first; drop into this skill afterwards if the user wants the underlying observations.

Its SKILL.md is about 4.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in AI & LLM Engineering, covering Email management and Embeddings. It works with PostHog. The repository describes itself as: :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error…

When your agent uses it

  • You need to perform semantic search over signals
  • Fetch every signal that contributed to a specific report
  • List signal types

Example prompts

  • “/signals”

Workflow steps

10 steps, taken from the first numbered list in SKILL.md.

  1. Always use text-embedding-3-small-1536 as the model name. This is the only model used for signals.
  2. embedText() arguments must be string literals. You cannot pass column references or expressions — the function resolves at compile time…
  3. Always time-bound your queries. The table has a 3-month TTL, but unbounded scans are expensive. Use timestamp >= now() - INTERVAL 1 MONTH…
  4. Always deduplicate. Without the argMax(..., inserted_at) GROUP BY document_id subquery, you will see stale and duplicate rows.
  5. Only select embedding when you need it. It's a 1536-element float array — omit it from the inner subquery when you're not doing similarity…
  6. Queries should not end with a semicolon. HogQL does not use them.
  7. Add a LIMIT to every query. Maximum allowed is 500 rows. In general, you should only select 10 or so signals, using semantic or full text…
  8. Extract metadata fields inside the dedup subquery. HogQL's metadata.field dot access only works on the raw table column. After argMax()…
  9. All JSON dot-access values are Nullable(String). HogQL extracts every JSON field as a String, even booleans and numbers. For…
  10. Don't alias argMax(timestamp, inserted_at) as timestamp if the same inner query also filters on the raw timestamp column. HogQL resolves…

What it can do on your machine

Read from SKILL.md and the folder at commit 10f9ad7. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are sql).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Signals loads about 4.3k tokens when it runs. Until then it costs about 119 tokens; SKILL.md has 1,509 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~119
When it runs · the whole SKILL.md, loaded when a task matches
~4.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,509 words (~4,342 tokens).

“Signals are automated observations that PostHog generates by monitoring a customer's product data across multiple sources — error tracking, web analytics, experiments, session replay, and more. Each signal is a short natural-language description of something noteworthy (e.g. "Error rate spiked…”

— opening of SKILL.md by PostHog, Custom licence
name
signals

Read the full SKILL.md on GitHub

Files

Just SKILL.md in products/signals/skills/signals of PostHog/posthog.

Open the folder on GitHubat commit 10f9ad7

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in PostHog/posthog, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Signals next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Signals compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Signals this skillPostHog/posthog40k—~4.3kAutomated safety check: PassCustom licence
3D Cv Labeling 2026curiositech/some_claude_skills2431 repos~3.2kAutomated safety check: NotesMIT
Chroma Vector DatabaseOrchestra-Research/AI-Research-SKILLs13k8 repos~2.3kAutomated safety check: PassMIT
CLIP Image-Text MatchingOrchestra-Research/AI-Research-SKILLs13k8 repos~1.7kAutomated safety check: PassMIT
SageMaker Serving Image Selectionhuggingface/skills11k1 repos~4.6kAutomated safety check: PassApache-2.0
Codebase Managementgiancarloerra/SocratiCode3.3k1 repos~1.8kAutomated safety check: PassAGPL-3.0

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  • Chroma Vector Database

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Works with

Categories

Questions about Signals

What does Signals do?

How to query the documentembeddings table for raw signal data using HogQL. Signals is an agent skill from PostHog/posthog, published by the product's own GitHub organization. How to query the documentembeddings table for raw signal data using HogQL.

When should I use Signals?

Signals fits situations like: you need to perform semantic search over signals; fetch every signal that contributed to a specific report; list signal types.

How do I install Signals in Claude Code?

Run `npx skills add PostHog/posthog --skill signals -a claude-code`. Or copy the skill folder (products/signals/skills/signals in PostHog/posthog) into .claude/skills/signals in your project. Claude Code loads it when a task matches its description.

How do I install Signals in Codex?

Run `npx skills add PostHog/posthog --skill signals -a codex`. Or copy the skill folder (products/signals/skills/signals in PostHog/posthog) into .agents/skills/signals in your project. Codex loads it when a task matches its description.

Can I use Signals in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add PostHog/posthog --skill signals -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/signals, .gemini/skills/signals, .github/skills/signals and .opencode/skills/signals in your project.

What does Signals need to run?

SKILL.md names no scripts, command-line tools or credentials: Signals is instructions for the agent only.

Does Signals access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Signals safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Signals use?

Signals has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Signals use?

About 4.3k tokens (SKILL.md is roughly 17k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Signals?

Skills that share tags, products or a category with Signals: 3D Cv Labeling 2026 (curiositech/some_claude_skills, 243 stars), Chroma Vector Database (Orchestra-Research/AI-Research-SKILLs, 13k stars), CLIP Image-Text Matching (Orchestra-Research/AI-Research-SKILLs, 13k stars) and SageMaker Serving Image Selection (huggingface/skills, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Signals?

PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,182 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 8, 2026.

Source: PostHog/posthog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.