Arcus Biosciences

Arcus Biosciences is a clinical-stage biopharmaceutical company focused on developing differentiated cancer immunotherapies, headquartered in Hayward, California. Its pipeline pairs multiple novel molecules across intra-tumoral immune pathways, including the HIF-2a inhibitor casdatifan, the CD73 inhibitor quemliclustat, the anti-TIGIT antibody domvanalimab, the anti-PD-1 antibody zimberelimab, and the CD39 inhibitor AB598. Surfaced as a portfolio company of GV and added to the API Evangelist network as a life-sciences company profile. Arcus publishes an agent-facing surface (llms.txt, an AI content map, and an Organization schema) but no public developer API.

Arcus Biosciences is profiled on the APIs.io network. Tagged areas include Company, Life Sciences, Biotechnology, Pharmaceuticals, and Oncology.

🌐 Visit website 📡 Profile data on GitHub

7.0/100 minimal ▬ flat Agent 0/100 human only Front door AI 1/6 silent Heartbeat 36/100 slowing Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Life Sciences Biotechnology Pharmaceuticals Oncology Immunotherapy Cancer Clinical Trials

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 7.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.7 / 9

Regulatory Posture 1.2 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 10.5 — up to +17.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/arcus-biosciences/apis.yml: open an issue on github.com/api-evangelist/arcus-biosciences to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Arcus Biosciences Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: arcus-biosciences
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/arcus-biosciences.png
name: Arcus Biosciences
description: Arcus Biosciences is a clinical-stage biopharmaceutical company focused on developing differentiated cancer immunotherapies,
  headquartered in Hayward, California. Its pipeline pairs multiple novel molecules across intra-tumoral immune pathways,
  including the HIF-2a inhibitor casdatifan, the CD73 inhibitor quemliclustat, the anti-TIGIT antibody domvanalimab, the anti-PD-1
  antibody zimberelimab, and the CD39 inhibitor AB598. Surfaced as a portfolio company of GV and added to the API Evangelist
  network as a life-sciences company profile. Arcus publishes an agent-facing surface (llms.txt, an AI content map, and an
  Organization schema) but no public developer API.
url: https://raw.githubusercontent.com/api-evangelist/arcus-biosciences/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- gv
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Life Sciences
- Biotechnology
- Pharmaceuticals
- Oncology
- Immunotherapy
- Cancer
- Clinical Trials
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://arcusbio.com/feed/
  type: BlogRSS
- type: Website
  url: http://arcusbio.com
- type: PrivacyPolicy
  url: https://arcusbio.com/privacy-policy/
- type: LLMsTxt
  url: llms/arcus-biosciences-llms.txt
- type: DomainSecurity
  url: security/arcus-biosciences-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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