feat(ai): Automatic function calling by hsubox76 · Pull Request #9489 · firebase/firebase-js-sdk

hsubox76 · 2026-02-11T02:45:58Z

Automatic function calling

Enabled only in chat (on sendMessage and sendMessageStream).

Docs (internal links)

High level design: https://docs.google.com/document/d/18aQASmH8maPIN0IEYRpmaww-403fZy1dtRYogFEepOI/edit?pli=1&tab=t.0#heading=h.9djzkrirbma9
Android implementation: https://docs.google.com/document/d/1Uqj2KSycqIYVtor33loJwi0GnYRsXwJX4ezfylJI7kU/edit?tab=t.0#heading=h.id6pjeb5eitq
- We follow this pattern to some degree. The user adds a functionReference to their FunctionDeclaration which is a reference to the actual function they would like called. If this is provided, then instead of returning a FunctionCall object that tells the developer what function to call with what arguments, the SDK actually calls the function, and sends the results back to the model in a FunctionResponse object. If the model responds with more FunctionCalls, it will call those functions as well, until the model finally responds with something that is not a FunctionCall, at which point the SDK will return that response to the developer.

Misc

parts was added to FunctionResponse for multimodal, which was something that was added to the model that our SDK needs to update to reflect: https://ai.google.dev/gemini-api/docs/function-calling?example=meeting#multimodal

gemini-code-assist · 2026-02-11T02:46:01Z

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Latest commit: 96c113e

The changes in this PR will be included in the next version bump.

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github-actions · 2026-02-11T02:46:14Z

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v16.2

gemini-code-assist · 2026-02-11T04:21:29Z

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packages/ai/src/methods/chat-session.ts

packages/ai/src/requests/stream-reader.ts

DellaBitta · 2026-02-11T14:23:43Z

packages/ai/src/methods/chat-session.ts

+      let functionCalls: FunctionCall[] | undefined;
+      let functionCallTurnCount = 0;
+      const functionCallMaxTurns =
+        this.requestOptions?.maxSequentalFunctionCalls ??


if maxSequentalFunctionCalls is zero or negative then it still executes at least one function. Should we prevent this from happening?

Just stepped through to check and surprisingly it won't. The order of operations of the loop is a little odd. So the first loop always executes, however each loop only makes one request to the server. The first request will send the user prompt, and if the response has callable FunctionCall parts, they are assigned to the variable functionCalls as needed. However the loop stops at the assignment, and hits the while condition, where it will stop if maxturns is set to 0. It's only on the second iteration of the loop where it would actually execute the functions (and send the result to the model).

Just to be sure I tested this out in my test app and that's the behavior I see. This actually would make it easy to test the limit so I will add a unit test that does this.

.changeset/cool-bulldogs-impress.md

* Refactor Github Action per b/485167538 (#9555) Co-authored-by: Ben Knutson <benknutson@google.com> * build(deps): bump lodash in /packages/auth-compat/demo/functions (#9482) Bumps [lodash](https://github.com/lodash/lodash) from 4.17.21 to 4.17.23. - [Release notes](https://github.com/lodash/lodash/releases) - [Commits](lodash/lodash@4.17.21...4.17.23) --- updated-dependencies: - dependency-name: lodash dependency-version: 4.17.23 dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> * build(deps): bump lodash in /packages/auth-compat/demo (#9464) Bumps [lodash](https://github.com/lodash/lodash) from 4.17.21 to 4.17.23. - [Release notes](https://github.com/lodash/lodash/releases) - [Commits](lodash/lodash@4.17.21...4.17.23) --- updated-dependencies: - dependency-name: lodash dependency-version: 4.17.23 dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> * build(deps): bump lodash in /packages/rules-unit-testing/functions (#9463) Bumps [lodash](https://github.com/lodash/lodash) from 4.17.21 to 4.17.23. - [Release notes](https://github.com/lodash/lodash/releases) - [Commits](lodash/lodash@4.17.21...4.17.23) --- updated-dependencies: - dependency-name: lodash dependency-version: 4.17.23 dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> * build(deps): bump lodash in /packages/auth/demo/functions (#9466) Bumps [lodash](https://github.com/lodash/lodash) from 4.17.21 to 4.17.23. - [Release notes](https://github.com/lodash/lodash/releases) - [Commits](lodash/lodash@4.17.21...4.17.23) --- updated-dependencies: - dependency-name: lodash dependency-version: 4.17.23 dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> * chore(deps): update dependency webpack-dev-server to v5.2.1 [security] (#9078) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore(deps): update google-github-actions/auth digest to fc21748 (#8879) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * build(deps-dev): bump lodash from 4.17.21 to 4.17.23 (#9465) Bumps [lodash](https://github.com/lodash/lodash) from 4.17.21 to 4.17.23. - [Release notes](https://github.com/lodash/lodash/releases) - [Commits](lodash/lodash@4.17.21...4.17.23) --- updated-dependencies: - dependency-name: lodash dependency-version: 4.17.23 dependency-type: direct:development ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> * Remove health metrics workflows (#9571) * feat(ai): Automatic function calling (#9489) * Updating otel dependencies * format * Updating otel dependencies * Remove fetch and user interaction libaries * Removing node tracing * format * Update angular example to modern standards (#9583) * chore(deps): update dependency @rollup/plugin-strip to v3 (#8745) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * fix(deps): update dependency @rollup/plugin-virtual to v3 (#8771) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * Use environment for wdr tokens (#9578) * use environment for wdr tokens * missed a file * fix(deps): update dependency @rushstack/node-core-library to v5 (#8816) * fix(deps): update dependency @rushstack/node-core-library to v5 * Fix method name --------- Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Christina Holland <chholland@google.com> * Update logs endpoint w/ location (fixed to `global` for now) --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: Google Admin <github-admin@google.com> Co-authored-by: Ben Knutson <benknutson@google.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Christina Holland <chholland@google.com> Co-authored-by: Anit Das <anitdas@google.com> Co-authored-by: Anthony Barone <tonybaroneee@gmail.com> Co-authored-by: Morgan Chen <morganchen12@gmail.com>

hsubox76 added 10 commits February 10, 2026 09:44

initial implementation

fc50b01

change to a while loop

d58dc46

streaming changes

4eb6c69

sorted out non streaming

a99c392

streaming and error wrapping

f6ec69f

add parts to FunctionResponse

ca61b4d

format

d0e92a0

Add some tests

af306a3

Add some more tests

0ef5a5d

Add docs and changeset

bea4634

hsubox76 added 3 commits February 10, 2026 19:41

Fix some bugs

1c3bb9b

better wording

36848ea

Add limit

6803654

hsubox76 marked this pull request as ready for review February 11, 2026 04:21

hsubox76 requested review from a team as code owners February 11, 2026 04:21

hsubox76 requested review from DellaBitta and rachelsaunders February 11, 2026 04:21

DellaBitta approved these changes Feb 11, 2026

View reviewed changes

hsubox76 added 3 commits February 11, 2026 10:06

Add unit tests for limit

cb79b76

improved comments

e514266

format

4507f92

rachelsaunders approved these changes Feb 18, 2026

View reviewed changes

.changeset/cool-bulldogs-impress.md Outdated Show resolved Hide resolved

code tag on ChatSession

96c113e

hsubox76 merged commit 47f8521 into main Feb 18, 2026
41 of 44 checks passed

hsubox76 deleted the ch-auto-fc branch February 18, 2026 19:38

google-oss-bot mentioned this pull request Feb 24, 2026

Version Packages #9591

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MaesterChestnut pushed a commit that referenced this pull request Feb 26, 2026

feat(ai): Automatic function calling (#9489)

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feat(ai): Automatic function calling#9489

feat(ai): Automatic function calling#9489
hsubox76 merged 17 commits intomainfrom
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Automatic function calling

Docs (internal links)

Misc

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Vertex AI Mock Responses Check ⚠️

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