Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-23 00:08 UTC

modelcontextprotocol / rust-sdk

The official Rust SDK for the Model Context Protocol

RustCustom license★ 3,832 stars⑂ 620 forkssince Feb 2025View on GitHub ↗
KindLibraryMCP serverNetwork servicehow this is determined
#rust#mcp#mcp-server#mcp-client

modelcontextprotocol/rust-sdk holds a health index of 99 out of 100, placing it in the Exceptional band. It scores highest on Vitality (99/100) and lowest on Security (75/100). It was last updated today. 4 contributors account for most of its recent work.

99
overall / 100
Exceptional

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

99
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 89 is calibrated to 99 on the published index scale (record calibration 2026-08-02).

Ownership

Model Context ProtocolOrganization · verified domain
50,062 followers42 public repossince Sep 2024

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
crates.iormcp3.1.43,659,925622 days ago
crates.iormcp-macros3.1.43,332,218622 days ago

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

99Exceptional · 21% of overall

Development activity

99Exceptional
How it's scored
36/36Push recency — last push 0 days ago
35.3/36Commit cadence — 51/52 weeks with commits
18/18Commit volume — 457 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year457
human_commit_share0.71
days_since_last_push0
active_weeks_last_year51

Release discipline

100Exceptional
How it's scored
27/27Ships releases — 100 releases published
36/36Release recency — latest release 2 days ago
27/27Release cadence — a release every ~2.2 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count100
latest_release_tagrmcp-v3.1.4
releases_from_tagsno
days_since_latest_release2
mean_days_between_releases2.2
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

91Excellent · 17% of overall

Popularity & adoption

90Excellent
How it's scored
58.1/60Stars — 3,832 stars
23.3/25Forks — 620 forks
8.3/15Watchers — 32 watchers
Inputs used
forks620
stars3,832
watchers32
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

86Excellent
How it's scored
22.5/22.5README
16.9/22.5License — license file present, not a recognized license
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
6.3/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges4
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesgithub.com, shields.io
has_pull_request_templateyes

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Monthly downloads — 6,992,143 downloads/month across crates
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesrmcp, rmcp-macros
dependents—
ecosystemscrates
total_downloads42,001,974
monthly_downloads6,992,143
unverified_packages_excluded—
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

90Excellent · 23% of overall

Maintainer resilience (bus factor)

83Excellent
How it's scored
43.2/54Bus factor — 4 contributor(s) cover half of all commits
16.4/22.5Commit distribution — top contributor authored 27% of commits
13.5/13.5Contributor breadth — 98 contributors
10/10OpenSSF Scorecard: Contributors — project has 17 contributing companies or organizations
Inputs used
bus_factor4
contributors_sampled98
top_contributor_share0.273

Issue & PR responsiveness

90Excellent
How it's scored
39.4/42Issue resolution — 94% of issues closed
25/30PR acceptance — 657/788 decided PRs merged
10.6/13Newcomer PR acceptance — 9/11 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Review — all changesets reviewed
Inputs used
merged_prs657
open_issues24
closed_issues360
prs_merged_7d6
prs_decided_7d8
prs_merged_30d33
prs_decided_30d38
issue_closed_ratio0.938
closed_unmerged_prs131
first_time_authors_30d8
first_time_prs_merged_30d9
first_time_prs_decided_30d11

Ownership & stewardship

91Excellent
How it's scored
30/30Ownership backing — organization-owned
20/20Verified domain
25/25Owner reach — 50,062 followers of modelcontextprotocol
15.7/25Track record — 42 public repos, account ~1 yr old
Inputs used
followers50,062
owner_typeOrganization
is_verifiedyes
owner_loginmodelcontextprotocol
public_repos42
account_age_days701

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 2 package(s) on crates
35/35Publish recency — latest publish 2 days ago
20/20Version history — 62 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesrmcp, rmcp-macros
ecosystemscrates
any_deprecatedno
min_days_since_publish2

Engineering Quality

Are baseline engineering and documentation practices in place?

86Excellent · 19% of overall

Engineering practices

84Excellent
How it's scored
24/24CI workflows — 7 workflow(s)
24/24Tests present
16/16Linter config — clippy.toml, crates/rmcp/Cargo.toml ([lints]), rustfmt.toml
0/9.6Pre-commit hooks
0/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 30 out of 30 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno

Documentation

90Excellent
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage site — https://docs.rs/rmcp
10/10Repository description
10/10Topics — 4 topics
0/10Wiki
Inputs used
topicsrust, mcp, mcp-server, mcp-client
has_wikino
homepagehttps://docs.rs/rmcp
docs_sitehttps://docs.rs/rmcp
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

75Good · 16% of overall

Security posture

75Good
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
3.8/7.5Branch-Protection — branch protection is not maximal on development and all release branches
2.5/2.5CI-Tests — 30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
7.5/7.5Code-Review — all changesets reviewed
2.5/2.5Contributors — project has 17 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.2/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
5/5Packaging — packaging workflow detected
0/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
5/5SAST — SAST tool is run on all commits
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
7.5/7.5Vulnerabilities — 0 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate7.5
Excluded from scoring (no data or not applicable): Signed-Releases. Remaining weights renormalized.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

81Excellent · 4% of overall

Agent context & guidance

85Excellent
How it's scored
45/45Agent instructions — .github/instructions/fetch-mcp-doc.instructions.md
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 71 of 71 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share1
agent_instruction_files.github/instructions/fetch-mcp-doc.instructions.md
agent_instruction_max_bytes2,422

Verify loop (build / test / typecheck)

80Excellent
How it's scored
18/18One-command bootstrap — justfile
22/22Automated tests
11/11Lint / format config — clippy.toml, crates/rmcp/Cargo.toml ([lints]), rustfmt.toml
11/11Static type checking — Rust (statically typed)
10/10Reproducible environment — devcontainer
0/10Demonstrated agent practice — no agent-authored commits among the last 100
8/8Automated maintenance — 17 of the last 100 commits are automated dependency updates
0/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfiles—
has_dockerfileno
typed_languageyes
bootstrap_filesjustfile
has_devcontaineryes
has_linter_configyes
typecheck_configs—
agent_commit_share0
toolchain_manifestsCargo.toml, conformance/Cargo.toml, crates/rmcp-macros/Cargo.toml, crates/rmcp/Cargo.toml, examples/clients/Cargo.toml, examples/servers/Cargo.toml, examples/simple-chat-client/Cargo.toml, examples/transport/Cargo.toml, examples/wasi/Cargo.toml
dependency_bot_commit_share0.17

Code legibility for models

98Exceptional
How it's scored
45/45Type-checkable code — Rust (statically typed)
52.7/55Manageable file sizes — 9/215 source files over 60KB
Inputs used
primary_languageRust
largest_source_bytes319,918
source_files_sampled215
oversized_source_files9

Machine-readable interfaces

60Moderate
How it's scored
0/40API schema (OpenAPI/GraphQL/proto)
20/20MCP server
40/40Runnable examples — examples
Inputs used
example_dirsexamples
has_mcp_signalyes
api_schema_files—
interfaces_expected_ofnetwork-service

Key facts

3,832GitHub stars
98contributors
457commits, last 12 months
0days since last push
100releases
4bus factor
24open issues
crates.iopackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • First-time contributor figures cover 12 of 16 authors (cap 12)
  • Could not fetch crates package 'mcp-conformance' from its registry
  • No resolved dependencies carried a version and a supported ecosystem

More detail

Star and fork history 0 ★ / 620 ⇿
0Stars
620Forks
100Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

0125250375500625610102025-022025-112026-08
Major 0Minor 0Patch 0

Each point covers 2 days.

OpenSSF Scorecard 7.5 / 10
7.5aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-23 00:08 UTC

10Binary-Artifactsno binaries found in the repo
5Branch-Protectionbranch protection is not maximal on development and all release branches
10CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
10Code-Reviewall changesets reviewed
10Contributorsproject has 17 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
9Licenselicense file detected
10Maintained30 commit(s) and 1 issue activity found in the last 90 days -- score normalized to 10
10Packagingpackaging workflow detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
10SASTSAST tool is run on all commits
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
10Vulnerabilities0 existing vulnerabilities detected
Direct dependencies 51
RegistryPackageVersion constraintManifest
crates.iormcp—conformance/Cargo.toml
crates.iotokio1conformance/Cargo.toml
crates.iotokio-util0.7conformance/Cargo.toml
crates.ioserde1conformance/Cargo.toml
crates.ioserde_json1conformance/Cargo.toml
crates.iotracing0.1conformance/Cargo.toml
crates.iotracing-subscriber0.3conformance/Cargo.toml
crates.ioaxum0.8conformance/Cargo.toml
crates.ioanyhow1conformance/Cargo.toml
crates.ioreqwest0.13conformance/Cargo.toml
crates.iourlencoding2conformance/Cargo.toml
crates.iourl2conformance/Cargo.toml
crates.iosyn3crates/rmcp-macros/Cargo.toml
crates.ioquote1crates/rmcp-macros/Cargo.toml
crates.ioproc-macro21crates/rmcp-macros/Cargo.toml
crates.ioserde_json1.0crates/rmcp-macros/Cargo.toml
crates.iodarling0.24crates/rmcp-macros/Cargo.toml
crates.ioasync-trait0.1.89crates/rmcp/Cargo.toml
crates.ioserde1.0crates/rmcp/Cargo.toml
crates.ioserde_json1.0crates/rmcp/Cargo.toml
crates.iothiserror2crates/rmcp/Cargo.toml
crates.iotokio1crates/rmcp/Cargo.toml
crates.iofutures0.3crates/rmcp/Cargo.toml
crates.ioindexmap2crates/rmcp/Cargo.toml
crates.iotracing0.1crates/rmcp/Cargo.toml
crates.iotokio-util0.7crates/rmcp/Cargo.toml
crates.iopin-project-lite0.2crates/rmcp/Cargo.toml
crates.iopastey0.2.0crates/rmcp/Cargo.toml
crates.iooauth25.0crates/rmcp/Cargo.toml
crates.iojsonwebtoken11crates/rmcp/Cargo.toml
crates.ioschemars1.0crates/rmcp/Cargo.toml
crates.iobase640.23crates/rmcp/Cargo.toml
crates.iohmac0.13crates/rmcp/Cargo.toml
crates.iosha20.11crates/rmcp/Cargo.toml
crates.iozeroize1crates/rmcp/Cargo.toml
crates.ioreqwest0.13.2crates/rmcp/Cargo.toml
crates.iosse-stream0.2.4crates/rmcp/Cargo.toml
crates.iohttp1crates/rmcp/Cargo.toml
crates.iourl2.4crates/rmcp/Cargo.toml
crates.iotower-service0.3crates/rmcp/Cargo.toml
crates.ioprocess-wrap9.0crates/rmcp/Cargo.toml
crates.iowhich8crates/rmcp/Cargo.toml
crates.iorand0.10crates/rmcp/Cargo.toml
crates.iotokio-stream0.1crates/rmcp/Cargo.toml
crates.iouuid1crates/rmcp/Cargo.toml
crates.iohttp-body1crates/rmcp/Cargo.toml
crates.iohttp-body-util0.1crates/rmcp/Cargo.toml
crates.iobytes1crates/rmcp/Cargo.toml
crates.iohyper1crates/rmcp/Cargo.toml
crates.iohyper-util0.1crates/rmcp/Cargo.toml
crates.iormcp-macros—crates/rmcp/Cargo.toml
All dependencies 55

Full resolved dependency set from the GitHub dependency graph: 41 direct and 14 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
crates.ioanyhow—direct
crates.ioasync-trait—direct
crates.ioaxum—direct
crates.iobase64—direct
crates.iobytes—direct
crates.iodarling—direct
crates.iofutures—direct
crates.iohmac—direct
crates.iohttp—direct
crates.iohttp-body—direct
crates.iohttp-body-util—direct
crates.iohyper—direct
crates.iohyper-util—direct
crates.ioindexmap—direct
crates.iojsonwebtoken—direct
crates.iooauth2—direct
crates.iopastey—direct
crates.iopin-project-lite—direct
crates.ioproc-macro2—direct
crates.ioprocess-wrap—direct
crates.ioquote—direct
crates.iorand—direct
crates.ioreqwest—direct
crates.ioschemars—direct
crates.ioserde—direct
crates.ioserde_json—direct
crates.iosha2—direct
crates.iosse-stream—direct
crates.iosyn—direct
crates.iothiserror—direct
crates.iotokio—direct
crates.iotokio-stream—direct
crates.iotokio-util—direct
crates.iotower-service—direct
crates.iotracing—direct
crates.iotracing-subscriber—direct
crates.iourl—direct
crates.iourlencoding—direct
crates.iouuid—direct
crates.iowhich—direct
crates.iozeroize—direct
crates.ioaskama—indirect
crates.iochrono—indirect
crates.ioclap—indirect
crates.iorstest—indirect
crates.ioserde_urlencoded—indirect
crates.iotokio-tungstenite—indirect
crates.iotoml—indirect
crates.iotower—indirect
crates.iotower-http—indirect
crates.iowasi—indirect
npm@modelcontextprotocol/sdk^1.10indirect
npmeventsource-parser^3.0.1indirect
npmexpress^5.1.0indirect
PyPIfastmcp—indirect
Dependency advisories not assessed

Advisory matching could not run for this report: No resolved dependencies carried a version and a supported ecosystem

Raw JSON report machine-readable

Feedback

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Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — crates.io.