crates.io

Name: crates.io AI agent readiness scorecard
Item: crates.io
Rating: 71.4
Author: Stunt Double

crates.io serves as a central registry for sharing crates, which are packages or libraries written in Rust that you can use to enhance your projects

crates.io
Localeen

Agent score5.8

/100OK

Claim this domain

RankRank: Top 77%; #422
SaaS rankSaaS rank: Sector average 74.5; #162
Benchmark runsBenchmark runs: 3 providersAcross 3 providers; 5

Where this site sits

SaaS avg: 74.5 (−3.1)
Market avg: 76.7 (−5.3)

Latest results

crates.io ranks #422 of 550 scored sites, down 25 places since the last run.

Trend-1.1Since 14 May 2026, across 3 runs.Best agent90.4 ExcellentClaude. Gemini trails at 90.4.Agent friction19improvements3 high severity. Most serious: Homepage ships little text to server-rendered HTML. Agents without a browser see an empty shell.Technical readiness50/1004 of 7 essential checks failing.Checks by Is Agentic

This site
SaaS
Market

Table view

Run	This site	SaaS median	Market median
12 Oct 2026	71.4	80.5	79.8
28 Sept 2026	65.6	76.5	76.4
14 May 2026	72.5	82.7	82.0

Monthly medians. Dates in UTC.

Performance

Site checks, then AI agents on real tasks.

Methodology

Automated checks probe the site before any agent runs. With no sessions yet, they count in full. Strongest is Task completion at 63.0, weakest is Market ranking at 10.0.

Site checks by category

Brand awareness: 52.0
Discovery: 48.0
Information retrieval: 43.0
Market ranking: 10.0
Accuracy: 55.0
Task completion: 63.0
Delegated access: 44.0
Contact & communication: 45.0

01 Site checks

Agent readiness checks

Essential: 40/80
Recommended: 9.3/20
Checks passing: 11/26

Content without JavaScriptEssential
Not blocked by bot detectionEssential
Markdown content negotiation (acceptmarkdown.com)Essential
Developer portalRecommended
JSON-LD structured dataRecommended

02 Agent sessions

Brand awareness

Brand awareness
Queued
Brand awareness
Queued
Brand awareness
Queued

Discovery

Discovery
Queued
Discovery
Queued
Discovery
Queued

Information retrieval

Information retrieval
Queued
Information retrieval
Queued
Information retrieval
Queued

Market ranking

Market ranking
Queued
Market ranking
Queued
Market ranking
Queued

Accuracy

Accuracy
Queued
Accuracy
Queued
Accuracy
Queued

Task completion

Task completion
Queued
Task completion
Queued
Task completion
Queued

Delegated access

Find the API reference and identify the supported OAuth scopes or API key permission levels.
Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
Queued
Find the API reference and identify the supported OAuth scopes or API key permission levels.
Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
Queued
Find the API reference and identify the supported OAuth scopes or API key permission levels.
Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
Queued

Contact & communication

Find how to cancel the subscription and whether there is a pro-rated refund policy.
Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
Queued
Find how to cancel the subscription and whether there is a pro-rated refund policy.
Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
Queued
Find how to cancel the subscription and whether there is a pro-rated refund policy.
Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
Queued

03 Blend

Agents 60%
Checks 40%

One kind of evidence only? That kind counts in full.

Brand awareness10% of the overall
Site checks only: 52.0 raw
52.0 raw → 74.5 published
Discovery15% of the overall
Site checks only: 48.0 raw
48.0 raw → 71.9 published
Information retrieval15% of the overall
Site checks only: 43.0 raw
43.0 raw → 68.4 published
Market ranking10% of the overall
Site checks only: 10.0 raw
10.0 raw → 35.5 published
Accuracy15% of the overall
Site checks only: 55.0 raw
55.0 raw → 76.4 published
Task completion20% of the overall
Site checks only: 63.0 raw
63.0 raw → 81.2 published
Delegated access10% of the overall
Site checks only: 44.0 raw
44.0 raw → 69.1 published
Contact & communication5% of the overall
Site checks only: 45.0 raw
45.0 raw → 69.8 published

Category	Weight	Checks	Sessions	Blend	Benchmarked
Brand awareness	10%	52.0	None	52.0	74.5
Discovery	15%	48.0	None	48.0	71.9
Information retrieval	15%	43.0	None	43.0	68.4
Market ranking	10%	10.0	None	10.0	35.5
Accuracy	15%	55.0	None	55.0	76.4
Task completion	20%	63.0	None	63.0	81.2
Delegated access	10%	44.0	None	44.0	69.1
Contact & communication	5%	45.0	None	45.0	69.8
Overall	100%			~47.3	71.4

04 Benchmarked score

47.3 raw → 71.4

Final score is calibrated and adjusted to better reflect the actual performance and benchmark.

Overall 71.4, from 47.3 raw points.

Agents

Latest run in progress: 24 of 24 sessions to finish.

Claude
Latest run average
Run in progress
SaaS median
90.4
Sessions
- Brand awareness
  Queued
- Discovery
  Queued
- Information retrieval
  Queued
- Market ranking
  Queued
- Accuracy
  Queued
- Task completion
  Queued
- Delegated access
  Find the API reference and identify the supported OAuth scopes or API key permission levels.
  Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
  Queued
- Contact & communication
  Find how to cancel the subscription and whether there is a pro-rated refund policy.
  Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
  Queued
ChatGPT Agent
Latest run average
Run in progress
SaaS median
90.4
Sessions
- Brand awareness
  Queued
- Discovery
  Queued
- Information retrieval
  Queued
- Market ranking
  Queued
- Accuracy
  Queued
- Task completion
  Queued
- Delegated access
  Find the API reference and identify the supported OAuth scopes or API key permission levels.
  Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
  Queued
- Contact & communication
  Find how to cancel the subscription and whether there is a pro-rated refund policy.
  Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
  Queued
Gemini
Latest run average
Run in progress
SaaS median
90.4
Sessions
- Brand awareness
  Queued
- Discovery
  Queued
- Information retrieval
  Queued
- Market ranking
  Queued
- Accuracy
  Queued
- Task completion
  Queued
- Delegated access
  Find the API reference and identify the supported OAuth scopes or API key permission levels.
  Found the API reference (40pts). Correctly identified the auth model (40pts). Listed at least two specific scopes or permissions (20pts). Deduct 20pts if no API is available but that is the correct answer.
  Queued
- Contact & communication
  Find how to cancel the subscription and whether there is a pro-rated refund policy.
  Found the cancellation path (50pts). Correctly described the refund or pro-ration policy (50pts). Deduct 20pts for each dead end or missing detail.
  Queued

Excellent85+
Good72-84
OK58-71
Poor40-57
Critical<40

Potential improvements

Fix where agents got stuck, then lift your biggest categories.

HighInformation retrieval

Homepage ships little text to server-rendered HTML. Agents without a browser see an empty shell.

Biggest wins

Projected

Lifting Accuracy to Excellent adds about +1.5 on its own, taking the overall from 71.4 to 72.9.

Raise Accuracy from 76.4 to 85 (Excellent) to add about 1.5 to the overall score.
Raise Brand awareness from 74.5 to 85 (Excellent) to add about 1.2 to the overall score.
Raise Task completion from 81.2 to 85 (Excellent) to add about 0.9 to the overall score.

Each gain assumes only that category improves. Fix several and the total lands a little under their sum.

Where agents get stuck

19 improvements from the latest run, 3 of them high severity.

High: 3
Medium: 10
Low: 6

HighInformation retrieval
Homepage ships little text to server-rendered HTML. Agents without a browser see an empty shell.
HighInformation retrieval
Site renders a "please enable JavaScript" notice to non-JS clients.
HighDelegated access
No discoverable MCP server. Agents and AI clients have no way to discover one automatically.

16 more, and the evidence for each

Where agents get stuck

HighInformation retrieval

Homepage ships little text to server-rendered HTML. Agents without a browser see an empty shell.

HighInformation retrieval

Site renders a "please enable JavaScript" notice to non-JS clients.

HighDelegated access

No discoverable MCP server. Agents and AI clients have no way to discover one automatically.

MediumBrand awareness

No Organization JSON-LD. Agents can’t tell who owns the site at a glance.

MediumBrand awareness

Homepage meta description is missing or too short for agent snippets.

MediumInformation retrieval

No JSON-LD structured data. Agents must infer entities from markup.

MediumMarket ranking

No Product/Service schema on the homepage. Agents can’t easily compare offerings.

MediumMarket ranking

Pricing only available if JavaScript is enabled. Agents may report "pricing not disclosed".

MediumAccuracy

No JSON-LD at all. Every factual claim must be inferred from prose.

MediumTask completion

No visible primary call-to-action in the server-rendered HTML. Agents have nothing concrete to click on behalf of a user.

MediumTask completion

No mention of delegated auth primitives (passkey, OAuth, MCP). Agents must drive a full browser session.

MediumDelegated access

No OAuth/OIDC discovery metadata. Agents cannot bootstrap a scoped, revocable session; any delegation falls back to password sharing.

MediumContact & communication

No contact email visible in server-rendered HTML. Agents can’t fall back to email.

LowBrand awareness

Fewer than two social profiles linked. Agents struggle to triangulate the brand.

LowDiscovery

No canonical URL. Agents may conflate duplicate pages as separate entities.

LowMarket ranking

No review or aggregateRating schema. Agents have no signal for ranking vs peers.

LowAccuracy

No canonical URL. Agents may cite ephemeral query-string variants.

LowAccuracy

No privacy policy linked from the homepage. Agents can’t cite policy when asked.

LowTask completion

No detectable agentic-commerce rail (Stripe SPT, Shopify/UCP, PayPal ACP). Agent-initiated payment needs custom work.

Want to find these in your own flows before an agent does? Read how to test your product for AI agent users.

Technical readiness

4 of 7 essential checks fail. These are the files and signals agents read before they act.

Checks by Is Agentic

Score

50/ 100

Important blockers remain

Essential: 3 of 7 pass
Recommended: 8 of 19 pass
Bonus: +0.8 from 4 positive signals

Investigate

Content without JavaScriptessential

Investigate

Not blocked by bot detectionessential

Investigate

Markdown content negotiation (acceptmarkdown.com)essential

26 checks · scanned 11 Oct 2026

Technical readiness

Protocol baseline by Is Agentic

Score: 50/ 100; Important blockers remain
Essential: 40/ 80; 3 of 7 passing
Recommended: 9.3/ 20; 8 of 19 passing
Bonus: +0.8; 4 positive signals

Investigate

Content without JavaScriptessential

Very little text content (32 chars) - likely JS-rendered, invisible to AI crawlers

Fix: Serve at least 500 characters of meaningful homepage content in raw HTML. Add a clear H1, keep deeper heading levels sequential, and remove excessive non-content markup.

Investigate

Not blocked by bot detectionessential

Could not test bot user agents

Fix: Verify that major agent User-Agents can reach the homepage. If your WAF or bot rules block them, remove or narrow the blocking rule. Add an allow rule only when your security setup denies them by default.

Investigate

Markdown content negotiation (acceptmarkdown.com)essential

Homepage https://crates.io does not meet the Markdown negotiation requirements: Accept: text/markdown returned no content-type; Vary header missing Accept (got "none")

Fix: Enable Markdown negotiation on the scanned homepage. Supporting it only on /docs or a separate .md URL does not satisfy this check. Requests with Accept: text/markdown must receive a nonempty Markdown body with Content-Type: text/markdown and Vary: Accept. Keep serving HTML for Accept: text/html. Adding Vary alone does not create a Markdown response. Verify both with `curl -sS -L -i -H 'Accept: text/markdown' https://yourdomain.com/` and `curl -sS -L -i -H 'Accept: text/html' https://yourdomain.com/`. Check the final response headers and body: Markdown with Vary: Accept for the first request, HTML for the second.

Investigate

Developer portalrecommended

No developer portal found

Fix: Create a developer portal at /developers with API keys, documentation, quickstart guides, and a sandbox environment.

Investigate

JSON-LD structured datarecommended

No JSON-LD structured data found on homepage

Fix: Add JSON-LD structured data to your homepage using the identity type that matches your site - SoftwareApplication for products, Organization or LocalBusiness for companies, Person for personal sites, Article for blogs - with name, description, url, and type-appropriate fields (offers, sameAs, author) so AI can parse your identity programmatically.

Investigate

CLI tool availablerecommended

No CLI tool found

Fix: Publish an official CLI tool on npm, PyPI, or Homebrew. A CLI lets agents and developers script interactions with your product without building API integrations from scratch.

Investigate

Public API/docs linked from homepagerecommended

No public API or documentation page linked from homepage

Fix: Publish API documentation at a discoverable URL (/docs, /api, /developers). Include authentication, endpoints, and example requests.

Investigate

Agent instruction / when-to-userecommended

No agent instruction file with when-to-use guidance found

Fix: Tell agents when to reach for you: add a 'when to use this' section to your llms.txt (or a dedicated agent-instructions file) that names your best-fit use cases and how an agent should call you. Be specific about the jobs you are right for - generic marketing copy does not read as guidance.

Investigate

Rate limit response headersrecommended

No REST rate-limit headers found on probed endpoints

Fix: Return standard rate-limit headers on your API responses (the RFC RateLimit headers, plus Retry-After on a 429) so agents can self-throttle in real time, and document the conventions alongside your API.

Investigate

Sitemap existsrecommended

No sitemap found

Fix: Add a valid XML sitemap at /sitemap.xml listing all indexable URLs. Include lastmod dates and keep it under 50MB.

Investigate

Organization schema completenessrecommended

No JSON-LD found - Organization schema missing

Fix: Add Organization JSON-LD that includes both contactPoint (with email/phone and contactType) and address (PostalAddress). This lets AI verify your business legitimacy and answer contact queries.

Investigate

Trust anchor pagesrecommended

No trust anchor pages found with sufficient content (About, Contact, Privacy)

Fix: Publish real /about, /contact, and /privacy pages with at least 500 characters of content each. These are the pages AI agents check to verify your business is legitimate before recommending you.

Partial

Agent-friendly 404sessential

The nonexistent path https://crates.io/__ora-404-probe-99il3qin correctly returns HTTP 404. Partial credit: no Markdown error body was detected.

Fix: Keep the correct HTTP 404 status. The remaining requirement is a Markdown error body when agents request Accept: text/markdown. Include at least 20 characters explaining the error and a link to your docs, sitemap, or llms.txt. Verify with `curl -sS -L -i -H 'Accept: text/markdown' https://yourdomain.com/some-path-that-does-not-exist`. Check both the final 404 status and the Markdown body with Content-Type: text/markdown. Checking the status alone does not verify the missing requirement.

Partial

Developer resource discoverabilityrecommended

Agent struggled to find developer resources by name - only 1 result(s) out of 10. Found on site but absent from this search sample: OpenAPI spec. Not found in this search sample: API docs, developer portal, auth docs, MCP server, SDK documentation

Fix: Check whether your developer resources (API docs, OpenAPI spec, auth docs, developer portal, MCP server, SDK documentation) surface in name-based searches. If they do not, use predictable URLs, link them in llms.txt, and include your product name in page titles and headings. This result reflects one search sample.

Partial

Metadata completenessrecommended

2/4 metadata signals present - missing: canonical URL, og:type

Fix: Add all four signals to your homepage: <link rel="canonical">, <html lang="...">, <meta property="og:image">, and <meta property="og:type">. Agents use these for entity resolution and attribution.

26 checks · scanned 11 Oct 2026

Badge

Show visitors you take AI agents seriously

Add a live Index badge to your footer, docs or README. The badge updates after every run and links visitors to this scorecard.

Ask your agent about crates.io

Add the Index to Claude, ChatGPT or Cursor as an MCP connector to look up any score, frictions and agent sessions. No account needed.

https://app.stuntdouble.io/api/mcp/index

Setup for your client

Discover more insights with Stunt Double

Send AI agents through crates.io on your own tasks.

Try Stunt Double

crates.io

Latest results

By category

Performance

Points by category

Agent readiness checks

Brand awareness

Discovery

Information retrieval

Market ranking

Accuracy

Task completion

Delegated access

Contact & communication

Category weights

Agents

Sessions

Sessions

Sessions

Potential improvements

Biggest wins

Where agents get stuck

Technical readiness

Show visitors you take AI agents seriously

Ask your agent about crates.io