Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-18 20:07 UTC

a2aproject / a2a-python

Official Python SDK for the Agent2Agent (A2A) Protocol

PythonApache-2.0★ 2,148 stars⑂ 497 forkssince May 2025View on GitHub ↗
KindLibraryNetwork serviceCommand-line toolhow this is determined

a2aproject/a2a-python holds a health index of 98 out of 100, placing it in the Exceptional band. It scores highest on Vitality (96/100) and lowest on Security (76/100). It was last updated today. 4 contributors account for most of its recent work.

98
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.

98
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 88 is calibrated to 98 on the published index scale (record calibration 2026-08-02).

Ownership

1,720 followers18 public repossince Jun 2025

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
PyPIa2a-sdk1.1.410,991,418590 days agoa2aa2a-protocola2a-sdkagent-2-agentagent2agent

Metrics by category

Vitality

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

96Exceptional · 21% of overall
How it's scored
36/36Push recencylast push 0 days ago
30.5/36Commit cadence44/52 weeks with commits
18/18Commit volume415 commits in the last year
10/10OpenSSF Scorecard: Maintained30 commit(s) and 10 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year415
human_commit_share0.87
days_since_last_push0
active_weeks_last_year44

Release discipline

100Exceptional
How it's scored
27/27Ships releases59 releases published
36/36Release recencylatest release 10 days ago
27/27Release cadencea release every ~15.7 days
0/10OpenSSF Scorecard: Signed-Releasesno data
Inputs used
releases_count59
latest_release_tagv1.1.4
releases_from_tagsno
days_since_latest_release10
mean_days_between_releases15.7
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
How it's scored
54/60Stars2,148 stars
22.5/25Forks497 forks
8/15Watchers28 watchers
Inputs used
forks497
stars2,148
watchers28
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

92Excellent
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized 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_badges5
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesgithub.com, shields.io
has_pull_request_templateyes
How it's scored
80/80Monthly downloads10,991,418 downloads/month across pypi
0/20Registry dependentsnot reported by this ecosystem
Inputs used
packagesa2a-sdk
dependents
ecosystemspypi
total_downloads
monthly_downloads10,991,418
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?

83Excellent · 23% of overall
How it's scored
43.2/54Bus factor4 contributor(s) cover half of all commits
18.1/22.5Commit distributiontop contributor authored 20% of commits
13.5/13.5Contributor breadth92 contributors
10/10OpenSSF Scorecard: Contributorsproject has 12 contributing companies or organizations
Inputs used
bus_factor4
contributors_sampled92
top_contributor_share0.196
How it's scored
37.4/42Issue resolution89% of issues closed
23.7/30PR acceptance699/884 decided PRs merged
9.8/13Newcomer PR acceptance9/12 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Reviewall changesets reviewed
Inputs used
merged_prs699
open_issues31
closed_issues250
prs_merged_7d8
prs_decided_7d13
prs_merged_30d26
prs_decided_30d36
issue_closed_ratio0.89
closed_unmerged_prs185
first_time_authors_30d8
first_time_prs_merged_30d9
first_time_prs_decided_30d12
How it's scored
30/30Ownership backingorganization-owned
0/20Verified domain
23.3/25Owner reach1,720 followers of a2aproject
11.8/25Track record18 public repos, account ~1 yr old
Inputs used
followers1,720
owner_typeOrganization
is_verifiedno
owner_logina2aproject
public_repos18
account_age_days454

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable1 package(s) on pypi
35/35Publish recencylatest publish 0 days ago
20/20Version history59 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagesa2a-sdk
ecosystemspypi
any_deprecatedno
min_days_since_publish0

Engineering Quality

Are baseline engineering and documentation practices in place?

92Excellent · 19% of overall
How it's scored
24/24CI workflows16 workflow(s)
24/24Tests present
16/16Linter configpyproject.toml ([tool.ruff])
9.6/9.6Pre-commit hooks
0/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests30 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 sitehttps://a2a-protocol.org/latest/sdk/python/api/
10/10Repository description
10/10Topics8 topics
0/10Wiki
Inputs used
topicsagents, generative-ai, a2a, a2a-client, a2a-mcp, a2a-protocol, a2a-server, agent2agent
has_wikino
homepagehttps://a2a-protocol.org/latest/sdk/python/api/
docs_sitehttps://a2a-protocol.org/latest/sdk/python/api/
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

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

76Good · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
0/7.5Branch-Protectionno data
2.5/2.5CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
7.5/7.5Code-Reviewall changesets reviewed
2.5/2.5Contributorsproject has 12 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
7.5/7.5Dependency-Update-Toolupdate tool detected
0/5Fuzzingproject is not fuzzed
2.5/2.5Licenselicense file detected
7.5/7.5Maintained30 commit(s) and 10 issue activity found in the last 90 days -- score normalized to 10
5/5Packagingpackaging workflow detected
2/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
2.5/5SASTSAST tool is not run on all commits -- score normalized to 5
4.5/5Security-Policysecurity policy file detected
0/7.5Signed-Releasesno data
0/7.5Token-Permissionsdetected GitHub workflow tokens with excessive permissions
1.5/7.5Vulnerabilities8 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate7
Excluded from scoring (no data or not applicable): Branch-Protection, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
0/25Indirect dependencies free of known advisoriestransitive set not separable from development and test dependencies in this scope
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories15
affected_packages5
assessed_packages123
unassessed_packages9
affected_by_severitycritical 1, high 3, moderate 1
direct_affected_packages0
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 123 resolved dependencies against OSV. 9 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. 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.

85Excellent · 4% of overall
How it's scored
45/45Agent instructionsAGENTS.md
15/15Machine-readable docs (llms.txt)llms.txt served by the project website (https://a2a-protocol.org/llms.txt)
40/40Legible commit history87 of 87 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtyes
llms_txt_urlhttps://a2a-protocol.org/llms.txt
legible_history_share1
agent_instruction_filesAGENTS.md
agent_instruction_max_bytes1,740
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format configpyproject.toml ([tool.ruff])
11/11Static type checkingsrc/a2a/py.typed
10/10Reproducible environmentlockfile
10/10Demonstrated agent practice6 of the last 100 commits agent-authored or agent-credited
8/8Automated maintenance13 of the last 100 commits are automated dependency updates
4/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
Inputs used
has_nixno
has_testsyes
lockfilesuv.lock
has_dockerfileno
typed_languageno
bootstrap_files
has_devcontainerno
has_linter_configyes
typecheck_configssrc/a2a/py.typed
agent_commit_share0.06
toolchain_manifests
dependency_bot_commit_share0.13
How it's scored
27/45Type-checkable codePython with type-check config (src/a2a/py.typed)
54.1/55Manageable file sizes4/246 source files over 60KB
Inputs used
primary_languagePython
largest_source_bytes110,980
source_files_sampled246
oversized_source_files4
How it's scored
40/40API schema (OpenAPI/GraphQL/proto)src/a2a/compat/v0_3/a2a_v0_3.proto
0/20MCP server
40/40Runnable examplessamples
Inputs used
example_dirssamples
has_mcp_signalno
api_schema_filessrc/a2a/compat/v0_3/a2a_v0_3.proto
interfaces_expected_ofnetwork-service

Key facts

2,148GitHub stars
92contributors
415commits, last 12 months
0days since last push
59releases
4bus factor
31open 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 16 authors (cap 12)
  • Could not fetch pypi package 'itk-python-v10-agent' from its registry
  • deps.dev does not index pypi:a2a-sdk@1.1.4; advisories assessed against the repository dependency graph instead

More detail

Star and fork history 0 ★ / 497 ⇿
0Stars
497Forks
59Releases

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.

0100200300400500490122025-052026-012026-09
Major 1Minor 2Patch 49

Each point covers 2 days.

OpenSSF Scorecard 7.0 / 10
7.0aggregate

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 · 2026-09-18 20:06 UTC

10Binary-Artifactsno binaries found in the repo
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
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 12 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 10 issue activity found in the last 90 days -- score normalized to 10
10Packagingpackaging workflow detected
4Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
5SASTSAST tool is not run on all commits -- score normalized to 5
9Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
2Vulnerabilities8 existing vulnerabilities detected
Direct dependencies 17
RegistryPackageVersion constraintManifest
PyPIa2a-sdkitk/pyproject.toml
PyPIfastapiitk/pyproject.toml
PyPIuvicornitk/pyproject.toml
PyPIgrpcioitk/pyproject.toml
PyPIgrpcio-toolsitk/pyproject.toml
PyPIprotobufitk/pyproject.toml
PyPIsse-starletteitk/pyproject.toml
PyPIhttpx-sseitk/pyproject.toml
PyPIpackagingitk/pyproject.toml
PyPIhttpx>=0.28.1pyproject.toml
PyPIpydantic>=2.11.3pyproject.toml
PyPIprotobuf>=5.29.5,<7pyproject.toml
PyPIgoogle-api-core>=1.26.0pyproject.toml
PyPIjson-rpc>=1.15.0pyproject.toml
PyPIgoogleapis-common-protos>=1.70.0pyproject.toml
PyPIculsans>=0.11.0pyproject.toml
PyPIpackaging>=24.0pyproject.toml
All dependencies 132

Full resolved dependency set from the GitHub dependency graph: 29 direct and 103 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
PyPIa2a-sdkdirect
PyPIculsans0.11.0direct
PyPIfastapidirect
PyPIfastapi0.136.3direct
PyPIfastapi0.140.13direct
PyPIgoogle-api-core2.31.0direct
PyPIgoogle-api-core2.33.0direct
PyPIgoogleapis-common-protos1.75.0direct
PyPIgrpciodirect
PyPIgrpcio1.81.0direct
PyPIgrpcio1.83.0direct
PyPIgrpcio-toolsdirect
PyPIgrpcio-tools1.81.0direct
PyPIgrpcio-tools1.81.1direct
PyPIhttpx0.28.1direct
PyPIhttpx-ssedirect
PyPIhttpx-sse0.4.3direct
PyPIjson-rpc1.15.0direct
PyPIpackagingdirect
PyPIpackaging26.2direct
PyPIprotobufdirect
PyPIprotobuf6.33.6direct
PyPIpydantic2.13.4direct
PyPIsse-starlettedirect
PyPIsse-starlette3.4.4direct
PyPIsse-starlette3.4.6direct
PyPIuvicorndirect
PyPIuvicorn0.49.0direct
PyPIuvicorn0.51.0direct
PyPIaiologic0.16.0indirect
PyPIaiologic0.17.1indirect
PyPIaiomysql0.3.2indirect
PyPIaiosqlite0.22.1indirect
PyPIalembic1.18.4indirect
PyPIannotated-doc0.0.4indirect
PyPIannotated-doc0.0.5indirect
PyPIannotated-types0.7.0indirect
PyPIannotated-types0.8.0indirect
PyPIanyio4.12.1indirect
PyPIanyio4.14.2indirect
PyPIasync-timeout5.0.1indirect
PyPIasyncpg0.31.0indirect
PyPIattrs26.1.0indirect
PyPIbackports-asyncio-runner1.2.0indirect
PyPIcertifi2026.2.25indirect
PyPIcertifi2026.7.22indirect
PyPIcffi2.0.0indirect
PyPIcffi2.1.0indirect
PyPIcfgv3.5.0indirect
PyPIcharset-normalizer3.4.6indirect
PyPIcharset-normalizer3.4.9indirect
PyPIclick8.3.1indirect
PyPIclick8.4.2indirect
PyPIcolorama0.4.6indirect
PyPIcoverage7.13.5indirect
PyPIcryptography48.0.1indirect
PyPIcryptography49.0.0indirect
PyPIdistlib0.4.0indirect
PyPIdunamai1.26.0indirect
PyPIexceptiongroup1.3.1indirect
PyPIexecnet2.1.2indirect
PyPIfilelock3.25.2indirect
PyPIgoogle-auth2.49.1indirect
PyPIgoogle-auth2.56.2indirect
PyPIgreenlet3.3.2indirect
PyPIgreenlet3.5.4indirect
PyPIgrpcio-reflection1.81.0indirect
PyPIgrpcio-reflection1.81.1indirect
PyPIh110.16.0indirect
PyPIhatchling1.29.0indirect
PyPIhttpcore1.0.9indirect
PyPIidentify2.6.18indirect
PyPIidna3.15indirect
PyPIidna3.18indirect
PyPIiniconfig2.3.0indirect
PyPIitk-python-v10-agent0.1.0indirect
PyPIjinja23.1.6indirect
PyPImako1.3.12indirect
PyPImarkupsafe3.0.3indirect
PyPInodeenv1.10.0indirect
PyPIopentelemetry-api1.42.1indirect
PyPIopentelemetry-sdk1.42.1indirect
PyPIopentelemetry-semantic-conventions0.63b1indirect
PyPIoutcome1.3.0.post0indirect
PyPIpathspec1.0.4indirect
PyPIplatformdirs4.9.4indirect
PyPIpluggy1.6.0indirect
PyPIpre-commit4.6.0indirect
PyPIproto-plus1.27.1indirect
PyPIproto-plus1.28.2indirect
PyPIpyasn10.6.4indirect
PyPIpyasn1-modules0.4.2indirect
PyPIpycparser3.0indirect
PyPIpydantic-core2.46.4indirect
PyPIpygments2.20.0indirect
PyPIpyjwt2.13.0indirect
PyPIpymysql1.1.2indirect
PyPIpytest9.0.3indirect
PyPIpytest-asyncio1.4.0indirect
PyPIpytest-cov7.1.0indirect
PyPIpytest-mock3.15.1indirect
PyPIpytest-timeout2.4.0indirect
PyPIpytest-xdist3.8.0indirect
PyPIpython-discovery1.2.0indirect
PyPIpyyaml6.0.3indirect
PyPIrequests2.33.0indirect
PyPIrequests2.34.2indirect
PyPIrespx0.23.1indirect
PyPIrfc87850.1.4indirect
PyPIruff0.15.16indirect
PyPIsetuptools83.0.0indirect
PyPIsniffio1.3.1indirect
PyPIsortedcontainers2.4.0indirect
PyPIsqlalchemy2.0.48indirect
PyPIsqlalchemy2.0.51indirect
PyPIstarlette1.2.1indirect
PyPIstarlette1.3.1indirect
PyPItomli2.4.0indirect
PyPItomlkit0.14.0indirect
PyPItrio0.33.0indirect
PyPItrove-classifiers2026.1.14.14indirect
PyPIty0.0.44indirect
PyPItypes-protobuf6.32.1.20260221indirect
PyPItypes-requests2.33.0.20260518indirect
PyPItyping-extensions4.15.0indirect
PyPItyping-extensions4.16.0indirect
PyPItyping-inspection0.4.2indirect
PyPIurllib32.7.0indirect
PyPIuv-dynamic-versioning0.14.0indirect
PyPIvirtualenv21.2.0indirect
PyPIwrapt2.1.2indirect
PyPIwrapt2.3.0indirect
Dependency advisories 5

This repository publishes no package the index resolves, so its own dependency graph was assessed — 123 packages, which also include development and test pins that never ship: 5 carry known advisories, of which 0 are direct. 9 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

PackageVersionRelationSeverityAdvisoriesFixed in
anyio4.12.1indirectcritical24.14.2
click8.3.1indirecthigh18.3.3
cryptography48.0.1indirecthigh650.0.0
starlette1.2.1indirecthigh41.3.1
cryptography49.0.0indirectmoderate250.0.0

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.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

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 statisticsPyPI.