csoai/a2a-census

A2A agent census

Start here — free verify: https://councilof.ai/gspc-verify/ (or the free MCP tool verify_card at https://councilof.ai/mcp) · Full catalog: https://councilof.ai/catalog.json · Methodology: https://councilof.ai/methodology/ · Measurement, not certification.

DISCOVERED — read-only census of A2A (Agent2Agent) agent cards. Keyless crawl of /.well-known/agent-card.json + A2A v1.0 conformance + ONE controlled deterministic capability probe per agent. No real task was ever sent to a stranger agent; nothing published. The live board is GET https://councilof.ai/api/gspc.

Defensible seed list: the agent domains discovered genuinely on-chain-live in the ERC-8004 live-filter (their declared service endpoints), plus a curated set of well-known A2A domains. We fetched /.well-known/agent-card.json (legacy agent.json fallback), checked it against the A2A v1.0 AgentCard shape (frozen Mar 2026), and ran one probe.

Result (a2a_census.json)

• 18 seeds crawled. Only 5 serve a conformant AgentCard; 13 serve no card (many return an HTML lander at the well-known path). Most on-chain-"live" agents do not publish a conformant A2A card.
• Capability-honesty axis — ONE deterministic probe I control: a JSON-RPC tasks/get with a random nonexistent id (read-only; asks the agent to do no real work, triggers no payment). Graded declared-vs-actual transport:
  • TRANSPORT_HONEST — declares A2A JSON-RPC and answered with a well-formed JSON-RPC envelope (e.g. A-Identity Trust Oracle, Brain On BNB).
  • TRANSPORT_MISMATCH — declares an A2A card but the transport did not answer JSON-RPC correctly (a real declared-vs-actual gap).

Reported context (cited, not endorsed, not A2A-specific)

Carnegie Mellon TheAgentCompany benchmark (arXiv:2412.14161, May 2025) reported the worst model (Llama-3.1-405b) failed 92.6% of real-world office tasks; the best (Gemini 2.5 Pro) still failed 70%. This is a general agent-task-completion benchmark, not an A2A-protocol measurement — cited to motivate measuring declared-vs-actual capability. https://arxiv.org/abs/2412.14161

Files

• a2a_census.jsonl — flat viewer table, one row per crawled seed (18): agent_name, domain, seed, card_state (CONFORMANT/NO_CARD), capability_honesty_verdict, skill_count, as_of. Field-presence lists live in a2a_census.json, not this table.
• a2a_census.json — per-seed card URL, conformance, field presence, honesty probe verdict.
• a2a_atoms.json — the unique conformant agents with their honesty verdict.
• ledger-card-a2a-agent-unsigned.json — the a2a.agent card-v0 atom (sig_ed25519=null — NO_LAPTOP_SIGN, queued for GHA OIDC signing).

What this is not

• No real A2A task was sent — only one controlled protocol-level probe per agent.
• Skill execution correctness is unmeasured[]. Streaming/push actuals unmeasured.
• Not a GSPC axis. No GSPC measure fields on any card.

Measurement, not certification. Verify a card (free, no account): https://councilof.ai/gspc-verify

What is in this repository

file	bytes	rows	what
a2a_census.json	7658		JSON document
README.md	4217		card
a2a_census.jsonl	4034	18	data (one JSON object per line)
ledger-card-a2a-agent-unsigned.json	2218		JSON document
a2a_atoms.json	2116		JSON document
manifest.jsonl		6	derived at 2026-09-04T04:33:29Z

manifest.jsonl is derived from this repository's own file tree at 2026-09-04T04:33:29Z; it lists every file with its size, its blob hash and a direct URL, so an agent can enumerate the repo without cloning it.

Citation

@misc{csoai_gspc_a2a_census,
  title        = {A2A agent census},
  author       = {{CSOAI Ltd}},
  year         = {2026},
  note         = {DOI record unavailable since 29 Sep 2026 (Zenodo account blocked; appeal pending)},
  howpublished = {Hugging Face Hub, \url{https://huggingface.co/datasets/csoai/a2a-census}},
  note         = {Live board: https://councilof.ai/api/gspc. Measurement, not certification.}
}

Objections, contact and corrections

To object to a row, ask for a re-check, request a correction or ask for a record to be withdrawn, email nicholas@csoai.org or use the appeals and dispute route at https://councilof.ai/dispute/. Corrections are listed in the corrections ledger at https://councilof.ai/api/corrections, with what changed and when. CSOAI Ltd (company no. 16939677, England and Wales) is the accountable publisher.

How to cite

CSOAI Ltd (Council of AI). A2A agent census. 2026. Hugging Face dataset csoai/a2a-census. https://huggingface.co/datasets/csoai/a2a-census

@misc{csoai_a2a_census,
  title        = {A2A agent census},
  author       = {{CSOAI Ltd}},
  year         = {2026},
  howpublished = {Hugging Face dataset, https://huggingface.co/datasets/csoai/a2a-census},
  note         = {Corrections: https://councilof.ai/api/corrections}
}

Licence: CC-BY-4.0. Attribute Council of AI, CSOAI Ltd (16939677), https://councilof.ai.

Corrections and verification

• Corrections ledger (signed): https://councilof.ai/api/corrections. Corrections to CSOAI's published records are logged there with what changed and when.
• Verify a signed record yourself, free and without an account: https://councilof.ai/gspc-verify/ (step by step: https://councilof.ai/signed/HOW-TO-VERIFY.md).
• Conformance kit for signed-receipts/v1, with test vectors for implementers: https://councilof.ai/spec/signed-receipts/v1/conformance/

Reuse and provenance

Download one published file at the recorded revision:

from huggingface_hub import hf_hub_download
path = hf_hub_download(
    repo_id='csoai/a2a-census', repo_type='dataset',
    filename='a2a_census.jsonl',
    revision='f781e4656c3df6d1284865b166700424ce1c80f5',
)
print(path)

Use the file's observation date, scope and licence when reusing it. Repository updates and downloads are not new measurements.

• Current GSPC board and methodology.
• Verify supported signed records and read corrections.
• Earlier page notes and dated integration announcements.

Measurement is not certification. A repository, signed record or passing software test does not by itself establish current board admission, product acceptance or benchmark leadership.