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brekkylab

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backlot
A local emulator for enterprise SaaS APIs — Slack, Gmail, Google Drive, GitHub, Jira, Notion, S3 and more — with the real response shapes...

Python · 218 stars

Beginner friendly Everything

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atlassian: a path no route matches answers the statusCode envelope, where real Jira answers RFC 7807 and real Confluence answers XML or an HTML page Open

fidelity

brekkylab/backlot#315 · 1 assignee · Opened Sep 22, 2026
github: a spent rate-limit window refuses nothing and reports `used` past its own cap, where real answers 403 Open

agent fidelity needs-maintainer

brekkylab/backlot#314 · 3 comments · 2 reactions · 1 assignee · Opened Sep 22, 2026
s3: only an object read carries a request id, where real carries x-amz-request-id and x-amz-id-2 on every response and names both in every error body Open

fidelity

brekkylab/backlot#313 · 1 assignee · Opened Sep 22, 2026
s3: five unserved methods on a bucket path share one FastAPI JSON 405 with an Allow naming HEAD alone, where real answers each of them in its own words Open

fidelity

brekkylab/backlot#312 · 1 assignee · Opened Sep 22, 2026
atlassian: HEAD and OPTIONS are a 405 on every route, where real answers a HEAD as the GET without its body and Jira answers an OPTIONS with the route's methods Open

fidelity

brekkylab/backlot#311 · 1 assignee · Opened Sep 22, 2026
notion: errors carry no request id and a header that is not `Bearer <token>` is read as a bad token, where real refuses it Open

fidelity

brekkylab/backlot#310 · 1 assignee · Opened Sep 22, 2026
google: an unknown alt is accepted on four of the five families, where real refuses it on every one and ahead of the credential Open

fidelity

brekkylab/backlot#309 · 1 assignee · Opened Sep 22, 2026
github: a callback is accepted and ignored, where real answers JSONP at 200 with a meta/data envelope Open

fidelity

Difficulty 5/5 Over a week Newbie friendliness 35/100

brekkylab/backlot#308 · Opened Sep 22, 2026
google: an anonymous Sheets POST read is 403 where real answers 401 Open

fidelity

brekkylab/backlot#307 · 1 assignee · Opened Sep 22, 2026
google: fields and prettyPrint are read from the last repeat, where real reads the first Open

fidelity

brekkylab/backlot#306 · 1 assignee · Opened Sep 22, 2026
google: a success body is rendered to the byte on the Sheets routes and nowhere else Open

fidelity

brekkylab/backlot#305 · 1 assignee · Opened Sep 22, 2026
confluence: child/page, child/comment and label serve the whole collection under a page envelope, ignoring limit and start Open

fidelity

brekkylab/backlot#304 · 1 assignee · Opened Sep 22, 2026
confluence: content serves an empty page for a spaceKey no space has and the page listing for a type it does not know, where real answers 404 and 501 Open

fidelity

brekkylab/backlot#303 · 1 assignee · Opened Sep 22, 2026
confluence: content and space cap limit at 1000 and content refuses start above 100000, where Backlot echoes any int and serves the page Open

fidelity

brekkylab/backlot#302 · 1 assignee · Opened Sep 22, 2026
confluence: the CQL search reads a limit or start it cannot convert as the default, where real answers a bodiless 404 Open

fidelity

brekkylab/backlot#301 · 1 assignee · Opened Sep 22, 2026
slack: the fidelity comparison's vendor side is an OpenAPI document frozen in 2020 Open

fidelity infra

Difficulty 5/5 Over a week Newbie friendliness 30/100

brekkylab/backlot#295 · Opened Sep 21, 2026
slack: a file's editors is a canvas field served only by search.files, and Backlot has no shape for it Open

fidelity

Difficulty 3/5 1-2 days Newbie friendliness 76/100

brekkylab/backlot#294 · Opened Sep 21, 2026
slack: a member's users.info/.list object and profile omit several fields real always serves Open

fidelity

Difficulty 3/5 1-2 days Newbie friendliness 68/100

brekkylab/backlot#290 · Opened Sep 21, 2026
Measurement comments should name the vendor and date, never the tenant they were measured on Open

docs

Difficulty 4/5 3-5 days Newbie friendliness 68/100

brekkylab/backlot#287 · Opened Sep 18, 2026
linear: nothing catches an SDK fragment that starts selecting a field Backlot doesn't declare on a type it serves in full Open

fidelity

Difficulty 4/5 3-5 days Newbie friendliness 68/100

brekkylab/backlot#277 · Opened Sep 17, 2026
google: HEAD is a 405 on every route, where Drive and Gmail answer it as the GET without its body and the three editor hosts refuse it with a 400 Open

fidelity

Difficulty 4/5 3-5 days Newbie friendliness 48/100

brekkylab/backlot#276 · Opened Sep 17, 2026
confluence: content and search answer a `_links` envelope missing `context`, `self` and `prev`, and `content`'s `next` never carries the `next=true` marker Open

fidelity

Difficulty 4/5 3-5 days Newbie friendliness 68/100

brekkylab/backlot#270 · Opened Sep 17, 2026
github: a ref ending in a slash resolves as the ref without it, where real treats the slash as part of the ref and refuses Open

fidelity good first issue help wanted

Difficulty 3/5 1-2 days Newbie friendliness 76/100

brekkylab/backlot#262 · Opened Sep 17, 2026
github: a trailing slash on /contents/{path} answers the resource, where real answers a 302 to the slash-free spelling Open

fidelity

Difficulty 3/5 1-2 days Newbie friendliness 72/100

brekkylab/backlot#261 · Opened Sep 17, 2026
github: readme/{dir} is not served, so /readme/ is a 404 where real answers the repository's README Open

fidelity

Difficulty 3/5 1-2 days Newbie friendliness 72/100

brekkylab/backlot#260 · Opened Sep 17, 2026
sheets: a spreadsheet is one sheet of single-column lines, so a real grid — tabs, columns, typed cells — has no representation Open

fidelity

brekkylab/backlot#159 · 1 assignee · Opened Sep 8, 2026
[Tracking issue] Supported sources Open

docs feature help wanted

Difficulty 5/5 Over a week Newbie friendliness 35/100

brekkylab/backlot#89 · Opened Aug 26, 2026
Build and publish a public dataset: a corpus covering every source, with a graded question set Open

brekkylab/backlot#19 · Opened Jul 26, 2026
Example: deterministic RAG eval — retrieval + ACL scored reproducibly, offline, in CI Open

feature

Difficulty 5/5 Over a week Newbie friendliness 48/100

brekkylab/backlot#2 · Opened Jul 20, 2026

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