Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-19 05:56 UTC

PrefectHQ / fastmcp

🚀 The fast, Pythonic way to build MCP servers and clients.

PythonApache-2.0★ 27,732 stars⑂ 2,357 forkssince Nov 2024View on GitHub ↗
KindCommand-line toolLibraryMCP serverhow this is determined
#model-context-protocol#fastmcp#mcp#agents#llms#mcp-clients#mcp-servers#mcp-tools#python

PrefectHQ/fastmcp holds a health index of 96 out of 100, placing it in the Exceptional band. It scores highest on Vitality (99/100) and lowest on Security (59/100). It was last updated today. A single contributor accounts for most of its recent work.

96
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.

96
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 84 is calibrated to 96 on the published index scale (record calibration 2026-08-02).

Ownership

PrefectOrganization · verified domain
994 followers42 public repossince May 2018

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
PyPIfastmcp4.0.554,364,8231221 day agoagentfastmcpllmmcpmcp-clientmcp-servermodel-context-protocol
PyPIfastmcp-slim4.0.548,887,673261 day agoagentfastmcpllmmcpmcp-clientmcp-servermodel-context-protocol
PyPIfastmcp-tasks4.0.567,758121 day agobackground-tasksfastmcpfastmcp-tasksmcpmodel-context-protocol
PyPIfastmcp-remote4.0.521,055221 day agofastmcpfastmcp-remotemcpmcp-remotemodel-context-protocoloauthstdio

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 — 1,832 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year1,832
human_commit_share0.89
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 1 days ago
27/27Release cadence — a release every ~4.2 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count100
latest_release_tagv4.0.5
releases_from_tagsno
days_since_latest_release1
mean_days_between_releases4.2
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?

96Exceptional · 17% of overall

Popularity & adoption

97Exceptional
How it's scored
60/60Stars — 27,732 stars
25/25Forks — 2,357 forks
11.7/15Watchers — 128 watchers
Inputs used
forks2,357
stars27,732
watchers128
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

92Excellent
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (Apache-2.0)
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_badges6
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 — 103,341,309 downloads/month across pypi
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesfastmcp, fastmcp-slim, fastmcp-tasks, fastmcp-remote
dependents—
ecosystemspypi
total_downloads—
monthly_downloads103,341,309
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?

73Good · 23% of overall

Maintainer resilience (bus factor)

38Weak
How it's scored
9/54Bus factor — 1 contributor(s) cover half of all commits
5.7/22.5Commit distribution — top contributor authored 75% of commits
13.5/13.5Contributor breadth — 95 contributors
10/10OpenSSF Scorecard: Contributors — project has 16 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled95
top_contributor_share0.748

Issue & PR responsiveness

69Good
How it's scored
35.5/42Issue resolution — 84% of issues closed
24.4/30PR acceptance — 2,379/2,920 decided PRs merged
3.2/13Newcomer PR acceptance — 7/28 first-time contributors' PRs merged in 30d
6/15OpenSSF Scorecard: Code-Review — Found 13/27 approved changesets -- score normalized to 4
Inputs used
merged_prs2,379
open_issues297
closed_issues1,615
prs_merged_7d19
prs_decided_7d44
prs_merged_30d27
prs_decided_30d54
issue_closed_ratio0.845
closed_unmerged_prs541
first_time_authors_30d10
first_time_prs_merged_30d7
first_time_prs_decided_30d28

Ownership & stewardship

96Exceptional
How it's scored
30/30Ownership backing — organization-owned
20/20Verified domain
21.6/25Owner reach — 994 followers of PrefectHQ
23.9/25Track record — 42 public repos, account ~8 yr old
Inputs used
followers994
owner_typeOrganization
is_verifiedyes
owner_loginPrefectHQ
public_repos42
account_age_days3,049

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 4 package(s) on pypi
35/35Publish recency — latest publish 1 days ago
20/20Version history — 122 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesfastmcp, fastmcp-slim, fastmcp-tasks, fastmcp-remote
ecosystemspypi
any_deprecatedno
min_days_since_publish1

Engineering Quality

Are baseline engineering and documentation practices in place?

92Excellent · 19% of overall

Engineering practices

94Exceptional
How it's scored
24/24CI workflows — 21 workflow(s)
24/24Tests present
16/16Linter config — pyproject.toml ([tool.ruff])
9.6/9.6Pre-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_configyes

Documentation

90Excellent
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage site — https://gofastmcp.com
10/10Repository description
10/10Topics — 9 topics
0/10Wiki
Inputs used
topicsmodel-context-protocol, fastmcp, mcp, agents, llms, mcp-clients, mcp-servers, mcp-tools, python
has_wikino
homepagehttps://gofastmcp.com
docs_sitehttps://gofastmcp.com
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

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

59Moderate · 16% of overall

Security posture

49Weak
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
3/7.5Branch-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
3/7.5Code-Review — Found 13/27 approved changesets -- score normalized to 4
2.5/2.5Contributors — project has 16 contributing companies or organizations
0/10Dangerous-Workflow — dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
0/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
3/5SAST — SAST tool is not run on all commits -- score normalized to 6
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
1.5/7.5Vulnerabilities — 8 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate4.9
Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages67
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the pypi:fastmcp@4.0.5 runtime dependency closure — what installing the published package pulls in — 67 packages. Reachability is not analyzed.

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.

90Excellent · 4% of overall

Agent context & guidance

100Exceptional
How it's scored
45/45Agent instructions — .cursor/rules/core-mcp-objects.mdc, .github/copilot-instructions.md, AGENTS.md, CLAUDE.md
15/15Machine-readable docs (llms.txt) — llms.txt served by the project website (https://gofastmcp.com/llms.txt)
40/40Legible commit history — 89 of 89 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtyes
llms_txt_urlhttps://gofastmcp.com/llms.txt
legible_history_share1
agent_instruction_files.cursor/rules/core-mcp-objects.mdc, .github/copilot-instructions.md, AGENTS.md, CLAUDE.md
agent_instruction_max_bytes21,741

Verify loop (build / test / typecheck)

82Excellent
How it's scored
18/18One-command bootstrap — justfile
22/22Automated tests
11/11Lint / format config — pyproject.toml ([tool.ruff])
11/11Static type checking — examples/atproto_mcp/src/atproto_mcp/py.typed, examples/smart_home/src/smart_home/py.typed, fastmcp_remote/fastmcp_remote/py.typed, fastmcp_slim/fastmcp/py.typed, fastmcp_tasks/fastmcp_tasks/py.typed
10/10Reproducible environment — Dockerfile, lockfile
10/10Demonstrated agent practice — 41 of the last 100 commits agent-authored or agent-credited
0/8Automated maintenance — no automated dependency updates observed
0/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfilesuv.lock
has_dockerfileyes
typed_languageno
bootstrap_filesjustfile
has_devcontainerno
has_linter_configyes
typecheck_configsexamples/atproto_mcp/src/atproto_mcp/py.typed, examples/smart_home/src/smart_home/py.typed, fastmcp_remote/fastmcp_remote/py.typed, fastmcp_slim/fastmcp/py.typed, fastmcp_tasks/fastmcp_tasks/py.typed
agent_commit_share0.41
toolchain_manifests—
dependency_bot_commit_share0

Code legibility for models

81Excellent
How it's scored
27/45Type-checkable code — Python with type-check config (examples/atproto_mcp/src/atproto_mcp/py.typed, examples/smart_home/src/smart_home/py.typed, fastmcp_remote/fastmcp_remote/py.typed, fastmcp_slim/fastmcp/py.typed, fastmcp_tasks/fastmcp_tasks/py.typed)
54.4/55Manageable file sizes — 9/863 source files over 60KB
Inputs used
primary_languagePython
largest_source_bytes132,982
source_files_sampled863
oversized_source_files9

Machine-readable interfaces

100Exceptional
How it's scored
0/40API schema (OpenAPI/GraphQL/proto) — not applicable to this kind of software
20/20MCP server
40/40Runnable examples — demos, examples
Inputs used
example_dirsdemos, examples
has_mcp_signalyes
api_schema_files—
interfaces_expected_of—
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto). Remaining weights renormalized.

Key facts

27,732GitHub stars
95contributors
1,832commits, last 12 months
0days since last push
100releases
1bus factor
297open issues
PyPIpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • First-time contributor figures cover 12 of 20 authors (cap 12)

More detail

Star and fork history 0 ★ / 2,357 ⇿
0Stars
2,357Forks
52Releases

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.

Only the most recent history is shown — this repository exceeds the collection window, so the earliest history is not captured.

1,2001,4001,6001,8002,0002,2002,4002,357192025-112026-042026-09
Major 2Minor 5Patch 30
OpenSSF Scorecard 4.9 / 10
4.9aggregate

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 · 2026-09-19 05:55 UTC

10Binary-Artifactsno binaries found in the repo
4Branch-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
4Code-ReviewFound 13/27 approved changesets -- score normalized to 4
10Contributorsproject has 16 contributing companies or organizations
0Dangerous-Workflowdangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
6SASTSAST tool is not run on all commits -- score normalized to 6
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
2Vulnerabilities8 existing vulnerabilities detected
Direct dependencies 7
RegistryPackageVersion constraintManifest
PyPImcp-types>=2.0.0,<3.0.0fastmcp_slim/pyproject.toml
PyPIplatformdirs>=4.0.0fastmcp_slim/pyproject.toml
PyPIpydantic>=2.12.0fastmcp_slim/pyproject.toml
PyPIpydantic-settings>=2.0.0fastmcp_slim/pyproject.toml
PyPIpython-dotenv>=1.1.0fastmcp_slim/pyproject.toml
PyPIrich>=13.9.4fastmcp_slim/pyproject.toml
PyPItyping-extensions>=4.0.0fastmcp_slim/pyproject.toml
All dependencies 223

Full resolved dependency set from the GitHub dependency graph: 18 direct and 205 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
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PyPIurllib32.7.0indirect
PyPIuv-dynamic-versioning—indirect
PyPIuvicorn0.41.0indirect
PyPIuvicorn0.51.0indirect
PyPIwatchfiles1.1.1indirect
PyPIwatchfiles1.2.0indirect
PyPIwcwidth0.8.2indirect
PyPIwebsockets—indirect
PyPIwebsockets16.0indirect
PyPIwebsockets16.1.1indirect
PyPIzipp3.23.0indirect
PyPIzipp4.1.0indirect
Dependency advisories 0

Installing pypi:fastmcp@4.0.5 pulls in 67 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.

No known advisories affect the assessed dependencies.

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

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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 — PyPI.