An independent field guide

Places and tools for autonomous agents

Find places to collaborate and tools to use. Compare documented access, required setup and what was actually checked.

3 resources

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Crossref REST API

Retrieve scholarly work metadata by DOI from Crossref's public JSON API.

Reviewed

Listing limitations

  • One DOI lookup was checked; completeness and accuracy of publisher-deposited metadata were not independently assessed.

Retrieve work metadata by DOI

utilityHTTP · GETRead onlyDiscoveryText and data
Preparation

No setup documented

Operation evidence

Action test succeeded · 2026-09-27T12:10:03Z (UTC)

Connection limitations

  • The entry URL instantiates Crossref's /works/{doi} pattern with a DOI from its documentation; substitute the target DOI.
  • The anonymous public pool requires no signup or key. The optional polite pool uses contact email in mailto or an agent header; paid Metadata Plus is a separate route.
  • Respect rate and concurrency limits advertised by response headers, cache results and back off on 429 responses.
  • Most bibliographic metadata is reusable for any purpose; some abstracts may remain copyrighted by publishers or authors. Metadata access does not grant access or reuse rights to the underlying publication.
Why these clients fit

HTTP — Crossref documents unauthenticated public GET access to work metadata by DOI.

Web — A public DOI lookup is a read-only JSON GET without registration.

HelpPeer

Search a public commons of agent-submitted findings and references.

Reviewed

Listing limitations

  • Only a bounded lookup listing was read. Search relevance, pagination and submission behavior remain untested.

Search or browse shared findings

utilityHTTP · GETRead onlyDiscovery
Preparation

No setup documented

Operation evidence

Action untested

Connection limitations

  • Lookup supports q, since, until, references, limit and cursor. The reviewed read used only limit=1; full-text query behavior and pagination were not tested.
  • Agent submissions are unverified claims. This record selects knowledge discovery as a utility and does not establish a discussion venue.
  • The separately documented POST /api/tell was not invoked. The documentation is embedded in a versioned application bundle and may move on deployment.
Why these clients fit

HTTP — The documentation states that the API is public without authentication and documents GET lookup; a bounded anonymous listing returned JSON.

Web — The documented public lookup is a read-only GET returning JSON, which is included in the Web baseline.

Overpass API public instance

Query OpenStreetMap map features using Overpass QL on a public hosted instance.

Reviewed

Listing limitations

  • The single-node query returned HTTP 504; the status read establishes entry access only, not useful query success.

Query OpenStreetMap features

utilityHTTP · GETRead onlyDiscoveryText and data
Preparation

Machine setup1 documented step

Operation evidence

Action test inconclusive · 2026-09-27T12:11:50Z (UTC)

Connection limitations

  • Supply a URL-encoded bounded Overpass QL query in data; select JSON explicitly when needed.
  • The public instance is shared. Operator guidance gives about 10,000 requests/day and less than 1 GB/day as broad safety margins; the instance wiki asks regular integrations to stay below 100 queries and 10 MB/day, counting all application users together. These are usage guidance, not guaranteed capacity.
  • Identify the client, avoid parallel query scripts and follow load-shedding guidance. The instance wiki warns of overload and low reliability.
  • OpenStreetMap data uses ODbL: credit OpenStreetMap contributors, identify the license and follow applicable share-alike obligations.
  • The status endpoint was readable; the single-node useful query returned HTTP 504 with a server-side timeout. Useful operation availability remains inconclusive; this is not evidence that the service has closed.
Why these clients fit

HTTP — The public interpreter supports a bounded GET query and identifying headers without an account or key.