aid: dt-agent-co-uk
name: Neva
description: >-
  Neva is a self-described "builder" agent: an A2A 0.3.0 agent at neva.dt-agent.co.uk that advertises one
  skill, Build Together, offering to co-build APIs, agent services, MVPs and integrations with other
  agents. Its operator publishes no website, documentation, pricing or contact - the whole public surface
  is an anonymous JSON-RPC endpoint at the host root and the agent card served at
  /.well-known/agent-card.json (and the legacy /.well-known/agent.json), listed on a2aregistry.org since
  2026-03-22. As of 2026-09-19 the endpoint answers and validates requests, but a well-formed message/send
  fails with a wrapped upstream 401 because the agent's own model-provider API key is invalid - a condition
  the registry's maintainers record on the same day.
url: https://raw.githubusercontent.com/api-evangelist/dt-agent-co-uk/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- A2A
- AI Agents
- Agent Services
- Software Development
- JSON-RPC
- Prototyping
- Integration
- Collaboration
apis:
- aid: dt-agent-co-uk:neva-a2a-agent
  name: Neva A2A Agent
  description: >-
    Neva's agent-to-agent surface: an anonymous A2A 0.3.0 JSON-RPC endpoint at the root of
    neva.dt-agent.co.uk (POST only; GET returns 405) implementing the a2a-sdk method set. message/send takes
    a full Message with a mandatory client-supplied messageId and {"kind":"text","text":...} parts; there is
    no streaming, no push notifications, no queryable tasks and no authenticated extended card. One skill,
    build-with-us. On 2026-09-19 a well-formed message/send returned JSON-RPC -32603 wrapping an upstream
    HTTP 401 "API key is invalid" - the agent's own model-provider credential - so the agent validates but
    does not currently reply. No OpenAPI, documentation or SDK.
  humanURL: https://neva.dt-agent.co.uk/.well-known/agent-card.json
  baseURL: https://neva.dt-agent.co.uk/
  tags:
  - A2A
  - AI Agents
  - JSON-RPC
  - Agent Services
  properties:
  - type: AgentCard
    url: a2a/dt-agent-co-uk-a2a.yml
    name: A2A Agent Card (graded, verbatim body alongside)
  - type: Authentication
    url: authentication/dt-agent-co-uk-authentication.yml
  - type: Conventions
    url: conventions/dt-agent-co-uk-conventions.yml
  - type: ErrorCatalog
    url: errors/dt-agent-co-uk-problem-types.yml
  - type: RateLimits
    url: rate-limits/dt-agent-co-uk-rate-limits.yml
  - type: Conformance
    url: conformance/dt-agent-co-uk-conformance.yml
  - type: Lifecycle
    url: lifecycle/dt-agent-co-uk-lifecycle.yml
  overlays: []
  x-humanurl-note: >-
    The provider publishes no human-readable page; the agent card is the only document that describes the
    API, so it stands in as humanURL rather than a URL that returns 404 (the apex) or 405 (the endpoint).
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://neva.dt-agent.co.uk/
  name: Provider URL declared in the agent card (provider.url); answers 405 to GET - it is the JSON-RPC endpoint, and no HTML site exists
- type: AgentCard
  url: a2a/dt-agent-co-uk-a2a.yml
  name: A2A Agent Card
- type: LLMsTxt
  url: llms/dt-agent-co-uk-llms.txt
- type: Authentication
  url: authentication/dt-agent-co-uk-authentication.yml
- type: Conventions
  url: conventions/dt-agent-co-uk-conventions.yml
- type: ErrorCatalog
  url: errors/dt-agent-co-uk-problem-types.yml
- type: RateLimits
  url: rate-limits/dt-agent-co-uk-rate-limits.yml
- type: Plans
  url: plans/dt-agent-co-uk-plans-pricing.yml
- type: Conformance
  url: conformance/dt-agent-co-uk-conformance.yml
- type: Lifecycle
  url: lifecycle/dt-agent-co-uk-lifecycle.yml
- type: DomainSecurity
  url: security/dt-agent-co-uk-domain-security.yml
x-website:
  replaced: https://dt-agent.co.uk/
  status_of_replaced: 404
  current: https://neva.dt-agent.co.uk/
  status_of_current: 405
  basis: provider.url declared in the agent card; also the a2aregistry.org listing url
  note: 'The harvest stub pointed Website at https://dt-agent.co.uk/, which returns a text/plain 404 for its root
    and every other path (confirmed 2026-09-19); www.dt-agent.co.uk has no DNS record. The pointer was replaced
    with the URL the provider declares for itself in its own agent card (provider.url), the same URL a2aregistry.org
    lists. It is the agent endpoint rather than a web page - GET answers 405 Allow: POST - but it is the provider''s
    own, self-declared address and the only live host it operates. Not constructed from the slug.'
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 13
  pass: local-v3