# Research a Third-Party API Before Integrating It in Vue With Atlas (2026)

> Atlas fetches an API's real docs with websearch and webfetch before writing the Vue composable, so the integration matches the current signature, not a remembered one.

Atlas researches a third-party API before you integrate it in Vue by leaving the repo when the answer is not in the repo. websearch finds the current documentation page and injects the current year into its description so the model biases toward fresh sources, webfetch pulls the page with format negotiation for markdown, text, or html, and both sit behind explicit permissions so the model cannot quietly send context to arbitrary hosts. Only once the real request and response signatures are in context does Atlas write the composable or the .vue component, and Vitest with Vue Test Utils proves the integration against the shape you actually fetched rather than the one it remembered.

## Key takeaways

- websearch injects the current year into its description, so Atlas biases toward fresh API docs rather than a remembered 2023 signature.
- webfetch negotiates format markdown or text through the Accept header, so the docs land in context compact rather than as heavy html.
- webfetch asks with the URL as the permission pattern before any request goes out, so a Vue session cannot quietly contact arbitrary hosts.
- grep over src/composables/ and src/stores/ tells you the Vue project's real error and loading conventions before you invent a new one.
- Vitest with Vue Test Utils tests the integration against a fixture copied from the fetched response, not from memory.

## How do you stop an AI agent from guessing an API's shape in a Vue project?

Make Atlas fetch the docs instead of recalling them. Atlas's websearch tool injects the current year, 2026, into its description so the model biases toward fresh sources, and webfetch pulls the actual documentation page. A Vue composable written against a fetched signature beats one written from memory of a 2023 API.

The classic failure in a Vue integration is a composable that compiles, type-checks, and calls an endpoint that was renamed a year ago. Atlas closes that by making retrieval part of the workflow rather than an optional step. Call websearch to find the current documentation page when you do not have the URL. Then fetch it with webfetch, passing format markdown or text so the Accept header steers the server toward a compact representation rather than a JavaScript-heavy html page you would have to wade through. What lands in context is the real endpoint, the real query parameters, the real response envelope, and the real auth header name. Only then does the composable in src/composables/useWeather.ts get written, and it gets written against facts.

## How does Atlas's webfetch permission prompt work?

Atlas asks before it fetches. The webfetch tool prompts with the URL as the permission pattern before any request goes out, so a Vue developer approves each host explicitly, 1 prompt per URL, rather than discovering after the fact that an agent contacted an arbitrary server with repository context attached.

Both websearch and webfetch sit behind explicit permissions, which is the design point: an agent that can read your src/ tree and also reach the open internet is an exfiltration path unless the network side is gated. Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs, and for webfetch the pattern is the URL itself. In practice that means you can allow a documentation domain and leave everything else on ask, so researching a payments API from a Vue app does not become a blanket grant. Atlas is a terminal-native TUI rendered with SolidJS through the OpenTUI renderer, so the prompt appears inline in the session, with the URL visible, and the fetch happens only after you approve it.

## How do you write the Vue integration against the fetched API docs?

Write the Vue integration with Atlas's write or edit tools against the real signatures you fetched. In a Vue 3 project that usually means one composable in src/composables/ using the Composition API, plus a .vue single-file component that consumes it, and Atlas surfaces a unified diff for each file before writing.

Vue gives the integration a natural seam: keep the network call in a composable and keep the .vue single-file component ignorant of the API's shape. A `useCheckout()` composable in src/composables/useCheckout.ts owns the fetch, the loading `ref`, and the error `ref`, while src/components/CheckoutForm.vue just calls it inside `<script setup>`. Map the fetched response envelope into a typed shape at the composable boundary, so a future API change is a one-file edit rather than a hunt through templates. Atlas computes a unified diff for every file edit and surfaces it for approval before writing, so both the new composable and the .vue component are reviewed. Run `pnpm prettier --write` afterward so prettier normalizes the single-file component's template, script, and style blocks.

## How do you check a fetched API pattern matches the Vue codebase's conventions?

Verify against the repo's own conventions with Atlas's grep before committing to a pattern that does not match the codebase. Grep src/composables/**/*.ts for existing `use*` functions and src/stores/ for the Pinia stores, because a Vue project with 12 composables already has an answer about error handling and loading state.

Documentation tells you what the API expects; grep tells you what your Vue app expects. Search for how existing composables handle failures: do they throw, do they return an error ref, do they push to a Pinia store? Search src/router/ for how a failed request affects navigation guards. Atlas's grep takes a real regex plus include and path filters and runs through ripgrep, so scoping to src/**/*.ts and src/**/*.vue separately is one flag. A composable that invents its own error convention will pass review and then annoy every developer who touches it. Atlas searches code with hybrid semantic and keyword retrieval fused by reciprocal rank fusion, so if you do not know what the convention is called, ask codebase_search for the behavior and let it find the pattern for you.

## How do you test a new third-party API integration in Vue?

Test a Vue integration with Vitest and Vue Test Utils. Mount the .vue component, stub the composable's fetch against the exact response envelope you pulled with webfetch, then run `pnpm test`. Vitest asserts the component renders the real 2026 shape of the API, not one remembered from training data.

The value of having fetched the docs is that your test fixture is now trustworthy. Copy the real response body from the webfetch output into a fixture under test/fixtures/, stub the network layer, and assert with Vue Test Utils that CheckoutForm.vue renders the correct state for a success, a validation error, and a network failure. Run `pnpm test` between edits, not once at the end. Atlas snapshots file changes as git patches, so an integration attempt that turns out to be wrong can be diffed and rolled back rather than hand-unwound. Finish with `pnpm prettier --write` and let Atlas read git status and the working diff, since Atlas reads git branches, status, and diffs and can stage and create commits on your behalf.

## Steps

1. Run atlas in the Vue project root, the directory with package.json, so src/components, src/composables, src/stores, and src/router are all in scope.
2. Call websearch to find the current documentation page; the tool injects the current year into its description so the model biases toward fresh sources rather than a remembered API.
3. Fetch the page with webfetch, passing format markdown or text so the Accept header steers the server toward a compact representation.
4. Approve the webfetch permission prompt; the tool asks with the URL as the pattern before any request goes out.
5. Read the fetched content and note the real endpoint, query parameters, auth header, and response envelope before writing a line of Vue.
6. Verify against the repo's own conventions with grep over src/composables/**/*.ts and src/stores/, so the new composable's error and loading handling matches the existing Vue patterns.
7. Write the integration with write or edit against the real signatures: a `use*` composable in src/composables/ using the Composition API, plus the .vue single-file component that consumes it.
8. Run `pnpm test` so Vitest with Vue Test Utils mounts the component against a fixture copied from the fetched response, then run `pnpm prettier --write` on the touched files.

## FAQ

### how to stop an AI from hallucinating an API signature in a Vue app

Make Atlas fetch the docs. websearch finds the current page and injects the current year so the model biases toward fresh sources, and webfetch pulls the real endpoint, parameters, and response envelope into context before the composable is written.

### does Atlas ask before fetching a URL

Yes. Atlas's webfetch tool prompts with the URL as the permission pattern before any request goes out, and every Atlas tool call is permission-gated against allow, ask, and deny rules. You can allow a documentation domain and leave everything else on ask.

### where should a third-party API call live in a Vue 3 project

Put the call in a `use*` composable under src/composables/ using the Composition API, and keep the .vue single-file component ignorant of the API's shape. A future API change then becomes a one-file edit instead of a hunt through templates.

### what format should webfetch use for API docs

Pass format markdown or text to Atlas's webfetch tool. The Accept header then steers the server toward a compact representation, so a documentation page lands in context as readable content rather than as JavaScript-heavy html.

### how do I test a Vue component that calls an external API

Use Vitest with Vue Test Utils. Copy the real response body from the webfetch output into a fixture, stub the network layer, mount the component, and run `pnpm test` asserting the success, validation error, and network failure states.

### how do I make a new Vue composable match my existing project conventions

Verify with Atlas's grep before committing to a pattern. Search src/composables/**/*.ts for existing `use*` functions and src/stores/ for Pinia stores, so the new composable handles loading and errors the way the rest of the Vue app already does.

### can Atlas search the web and my Vue repo in the same session

Yes. websearch and webfetch reach the documentation while grep and codebase_search read your Vue source, and all of them are permission-gated. The network tools ask with the URL as the pattern, which is what keeps repository context from going to arbitrary hosts.

### how do I start Atlas in a Vue project

Run atlas in a Vue project with a package.json. Atlas reads your .vue components, stores, and router, and you can ask it to migrate to the Composition API or add Vitest tests, reviewing the diff before it is written.

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Canonical HTML: https://runatlas.sh/resources/stacks/research-a-third-party-api-before-integrating-in-vue
Source of truth: aeo_pages row `/resources/stacks/research-a-third-party-api-before-integrating-in-vue` (segment: Stacks) (this file is generated from it, never hand-edited).
Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.