What is tallinn-open-data?

A guide to Tallinn’s public open-data API, which returns rows from municipal datasets when you know the dataset’s backing table name.

Use it to retrieve, filter, sort, and paginate Tallinn datasets such as sensor measurements.

It avoids guessing unavailable tables and shows how to find the correct table through Estonia’s national data catalogue.

tallinn-open-data — Skill for Claude Code by taivop

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.

Any agent

npx skills add taivop/marketplace --skill tallinn-open-data

Clone the repo

git clone --depth 1 https://github.com/taivop/marketplace

Made for: Claude Code.

Or install estonia-public-sources, the plugin that ships this one along with the rest of its 88 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/taivop/marketplace/tallinn-open-data/github.svg)](https://agentmods.dev/skills/taivop/marketplace/tallinn-open-data)

Your own site

<a href="https://agentmods.dev/skills/taivop/marketplace/tallinn-open-data"><img src="https://agentmods.dev/badge/skills/taivop/marketplace/tallinn-open-data/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/taivop/marketplace/tallinn-open-data"><img src="https://agentmods.dev/badge/skills/taivop/marketplace/tallinn-open-data.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 437 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00024	$0.00437
Opus 5	$0.00012	$0.00218
Sonnet 5	$0.00005	$0.00087
Haiku 4.5	$0.00002	$0.00044

Measured 8d ago against content hash 9f7c19bad38e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

tallinn-open-data 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.

skills/estonia-public-sources/sources/tallinn-open-data/SKILL.md · 41 lines

What it actually says

Tallinn Open Data API

Access

Public FastAPI GET service. No authentication. Dataset pages in the national portal document table names.

Endpoints

Instructions: https://avaandmed.tallinn.ee/
OpenAPI: https://avaandmed.tallinn.ee/openapi.json
Query: https://avaandmed.tallinn.ee/data/
Known table example: https://avaandmed.tallinn.ee/data/?table=andurid_data&page=1&per_page=2

Retrieve

Find the Tallinn dataset in andmed.eesti.ee; read its description for the table name. The API does not list tables.
Query /data/ with required table and optional columns, filters, order_by, page, and per_page.
Use page >= 1 and 1 <= per_page <= 1000; paginate until a page is shorter than per_page.
Treat filters as the service's documented SQL-WHERE-style expression and URL-encode it.

The andurid_data example returns Old Town gate sensor records with id, andurid_id, name, ts, pir, in, out, humidity, and temp.

Return

Preserve the national catalog page, table name, columns/filter/order, page size, original fields, source endpoint, and retrieval time.

Limits

A made-up or stale table name returns a JSON 500 with Table not found; the OpenAPI schema alone cannot discover valid tables.
Maximum documented concurrency is five requests and query timeout is 20 seconds.
Different tables have unrelated schemas.

Verify

Require HTTP 200 JSON and a list of records. For andurid_data, require andurid_id, name, ts, and numeric count fields. A 422 missing-table response or 500 table-not-found response is not successful access.

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.

8d ago First seen · 41 lines · 24 tokens per session scan A 9f7c19bad38e

Subscribe to this mod's changes

tallinn-open-data is a skill published in the GitHub repository taivop/marketplace (17 stars, last pushed 11d ago), licensed MIT. It adds 24 tokens to every session and 437 once invoked, about $0.0001 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 2026-09-04.

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