Self-updating documentation after pull request mergesSelf-updating documentation after pull request merges

A product change merges and a documentation bot opens a useful pull request. A month later, an access failure stops a run, a release ships while the source is paused, and the quickstart still describes last week's behavior. The first draft worked. The ongoing workflow has a coverage gap.

Self-updating documentation is a workflow that repeatedly detects relevant changes, proposes affected content updates, validates them, and carries approved changes through publication and verification. Teams can automate different parts of that workflow. The name alone does not tell you which steps run, which sources are covered, or who decides that an update can go live.

This guide is for engineering and documentation teams whose customer-facing content lives in Git. It explains automated documentation updates after pull request merges, current Thally Track setup, and how to keep the workflow accountable across later changes. We build Thally. Product capabilities below come from official documentation, not a hands-on accuracy benchmark.

Follow the update through to the published page

Treat a documentation PR as an intermediate result. A complete workflow needs these stages:

1. Observe a relevant change. Identify the source repository, branch, revision, and applicable product release. A watcher cannot cover a source it never receives.
2. Identify affected claims and draft the update. Trace behavior into the guides and examples that describe it. Preserve pages for older releases when they remain correct.
3. Validate and review. Check evidence, executable examples, and the destination build. Name the person or policy that authorizes publication. Draft generation and publication authority are separate capabilities.
4. Publish with the applicable release. A merged code change can still be behind a feature flag or in an unpublished package. Use the destination's normal release process when the documented behavior is available.
5. Verify the result and continue checking. Read the published page and its relevant search or machine-readable outputs. Keep the source revision and outcome so the next run has an auditable starting point.

Define what the workflow covers

Before enabling ongoing updates, write down the boundaries your team will operate:

• Sources and versions: repositories, branches, watched paths, release lines, and changes made outside Git. If support content or a product setting changes elsewhere, establish how that information reaches the workflow.
• Starting point and cadence: the first revision covered, which events start work, and what scheduled checks compare. Ask whether setup checks existing inaccuracies or only later changes.
• Destinations: the allowed content paths, formats, and access for each repository. An unsupported or disconnected help center is a coverage gap, even when the primary docs update succeeds.
• Review and publication: an owner for drafts, release timing, and each destination's checks. Decide who handles a rejected draft or a run that needs attention.
• Evidence and recovery: a record of source revision, run outcome, resulting PR, reviewed release, and published verification. Record uncovered intervals and a recovery owner when a run fails or is paused.

Check these boundaries again when a repository, branch, product version, or destination changes. Adding a new watcher does not establish that earlier releases were reviewed.

What should update automatically?

Use the source of truth that fits each kind of content:

Content	Automation	What still needs review
API reference	Generate from the released OpenAPI specification	Whether the specification matches the deployed API
SDK and CLI reference	Generate from the release's types, comments, and command definitions	Missing explanations and compatibility notes
Code samples	Import tested examples from versioned source	Whether the example demonstrates the task the page promises
Guides, tutorials, and help articles	Analyze the product change and draft affected prose	Behavior, release timing, completeness, and reader context

Generating reference material does not update every guide that mentions the same behavior. A reminder that says “check the docs” leaves that discovery work to a person. Change-driven automation needs to connect a specific source change to specific claims in the content.

For the broader process, start with keeping documentation in sync with code. For workflow files and cross-repository notifications, use the CI documentation updates guide.

Example: a configuration rename after a merge

Suppose a fictional Acme SDK release replaces timeout_ms with requestTimeoutMs. For this example, the new version rejects the old key. That is an illustrative compatibility rule, not a claim about an actual SDK.

An effective documentation update traces the change beyond the configuration reference:

Page	Before the change	Required update
Configuration reference	Lists timeout_ms	Document requestTimeoutMs and its unit
Quickstart	Initializes the new SDK with the old key	Replace the key and test the complete example against the new version
Migration guide	Has no entry for the rename	State the affected version, before/after names, and upgrade action
Troubleshooting	Suggests increasing timeout_ms	Use the new name for the new version
Older-version docs	Correctly document the previous SDK	Keep the old key and make version applicability clear

A global find-and-replace would damage the older-version docs. A useful draft explains why each edited page applies to the new release and why an apparently related page stays unchanged.

The review handoff needs the source PR or commit, the affected release, the page and claim being changed, and the proposed correction. Uncertainty belongs in that handoff. The writer must not invent a new default or claim backward compatibility without evidence.

Check repeated runs, pauses, and recovery

Use the Acme rename above as one case in a longer acceptance check. The worksheet below is hypothetical. It describes evidence to collect from your chosen workflow, not results from a tool run.

Event	What to establish	Evidence to retain
First scheduled check	Whether it audits existing docs or establishes a starting revision	Coverage start and a separate decision about older inaccuracies
Public rename in a new release	Required pages change while older-version pages remain valid	Source revision, expected pages, reviewed edits, and release version
Internal refactor	A confirmed no-change outcome is distinguishable from a stopped run	Run result and the reason no user-facing claim needs an update
Access failure	The change remains uncovered until recovery is verified	Failed revision, error, recovery owner, and follow-up result
Source paused while changes ship	The missed interval is explicitly reviewed	Last covered revision, later changes, and the chosen backfill procedure
Same event delivered again	Duplicate delivery does not create conflicting work	Source identity, trigger, and resulting run or PR identities
An incorrect update is published	The correction restores the intended released behavior	Revert or correction, related product version, and live-page check

For Thally specifically, the Track guide says the first scheduled check establishes a branch revision. Later checks compare from that point. It also documents duplicate-delivery handling. Pull request updates and merged changes remain separate review points, so two different triggers are not necessarily duplicate events.

For any system, inspect its pause and backfill rules before relying on recovery. If the documentation does not establish them, keep the interval uncovered until you have reviewed the changes and verified the necessary updates. Do not mark a source revision covered solely because a retry started.

How to set up automated documentation updates with Thally Track

Track requires Thally Cloud access, including an active trial, and consumes shared workspace AI credits. The open-source publishing engine and the managed Track service are separate. Check current plans and the Track setup guide before starting.

1. Connect the repositories that change the product

In Thally Cloud, open your site and select Track. An owner or editor can connect Product sources after authorizing the Thally GitHub App for the relevant repositories.

Select the product repository and base branch. Add path filters if only part of a monorepo defines the product you document. For the Acme example, include the SDK implementation and configuration schema. Watching only the API specification would miss an SDK-only rename.

A site can watch multiple Product sources, such as an API, SDK, and web application. Confirm the branch explicitly. A merge into a different release branch does not establish that the change shipped on the tracked branch.

2. Choose when documentation work starts

New sites default to Merged changes. This starts a check when a PR merges into the configured branch. Track also supports Pull request updates for trusted, same-repository, non-draft PRs and Scheduled checks for periodic branch comparisons. Trigger settings apply across the site's enabled Product sources.

For pre-merge drafting, enable Pull request updates. Forks and untrusted contributor PRs do not qualify for that trigger. Scheduled checks establish a branch checkpoint on the first run and compare later changes against it. See the trigger rules for details.

A code merge is not necessarily a release. A feature flag, staged rollout, or unpublished SDK package can leave the public product unchanged. Draft after merge if that suits your workflow, then hold the documentation merge until the documented behavior is available. For breaking changes, review code and docs together and coordinate publication with the release owner.

3. Add the places customers read about the product

The primary documentation repository is one destination. If the same behavior appears in a website or Git-backed help center, go to Site settings → Knowledge surfaces and connect those repositories as additional destinations.

Confirm each destination's branch, optional root, and exact allowed files or directories. These are content repositories the GitHub App can access, not an automatic connection to every hosted support platform. Existing JSX and TSX destinations allow visible prose edits within the documented publication limits.

Each qualifying event creates independent runs for the primary docs and enabled surfaces. An affected repository can receive a ready-for-review PR while another finishes without a change. Adding a destination later does not retroactively include it in an earlier event. The Knowledge surfaces guide defines the scope and validation rules.

4. Follow the result and review the PR

On the Track page, inspect the source revision, destination, and final result:

• Ready for review: open the GitHub PR, inspect the proposed edits, and run the destination's checks.
• No update needed (called No docs change in the setup guide): no update was proposed. Verify that result against changes you know need documentation during your evaluation.
• Needs attention: the run stopped before opening a PR. Read the run details and resolve the reported problem before treating the change as covered.

Track never merges its own PRs. The primary docs publish through the normal release path after review and validation. Knowledge surfaces use their own reviewers, checks, previews, and publishing workflows. Thally does not build or publish those destination repositories, so their checks remain your responsibility.

Check the documentation change before publishing

Review an automated PR with the same standards as a human contribution:

1. Confirm the evidence. Open the source change and verify names, defaults, availability, and applicable versions. A plausible explanation is not enough.
2. Check the complete task. Read the quickstart or guide from its prerequisites through its expected result. A correct parameter table can still leave the surrounding procedure broken.
3. Run executable examples. Use the supported package or API version in an isolated environment. Record what ran and what passed. Label an example unverified if required access is unavailable.
4. Run content checks. Build the site and check links, navigation, metadata, and rendered code blocks. Review a preview at the changed heading.
5. Check machine-readable output. Regenerate search indexes, Markdown exports, llms-full.txt, and MCP content where the publishing system uses them. Check the changed page appears with the same facts and version.
6. Coordinate release timing. Confirm the product behavior is available, merge through the normal review process, then check the published page.

Neither an MCP endpoint nor llms.txt keeps an old page accurate. They expose content to clients. Agent-readable documentation still needs a maintained source, correct version, and refreshed published outputs.

Evaluate tools across the full workflow

Automated maintenance is available in several platforms. Compare the trigger, destination, and review boundary rather than assuming only one product can read code:

Tool	Documented workflow	What to confirm
Thally Track	Product-source events create PRs ready for review in affected connected content repositories	Source paths, destination scopes, Cloud access, and each repository's checks
Mintlify Autopilot	Beta agent proposes code-driven updates and performs ongoing maintenance	Pro or Enterprise, connected sources, credits, launch handling, and missed intervals
Mintlify Automations	Configured prompts run on selected triggers, including code-change events	Pro or Enterprise eligibility and the configured review or direct-merge policy
ReadMe GitHub AI Writer	Connected PRs produce proposed updates on a ReadMe review branch	Pro or above and when the documentation should be published relative to the code
GitBook Agent for GitHub	A GitHub PR or issue mention supplies context for a linked GitBook change request	Whether an on-request trigger meets your post-merge automation requirement

Mintlify's Autopilot documentation distinguishes it from configurable Automations. Its default work includes code-change suggestions and a daily quality check. For feature launches, it can maintain a draft docs PR as code merges, then mark it ready when code has merged or a launch date is set. That readiness still needs your release review.

Autopilot pauses when credits run out or the plan no longer includes it. On resume, it builds context on changes during the pause but does not create updates for them. This is a concrete reason to inspect backfill behavior rather than assume resumption repairs missed work. These beta capabilities require Pro or Enterprise. Review current plans and credit rules.

These are documented capabilities, not a ranking of draft quality. The documentation automation software comparison covers the wider category.

Choose a small set of past changes with known outcomes: a public rename, a changed default, a new feature, and an internal refactor that needs no docs. Before running a tool, write down the pages you expect to change and the pages that must stay intact.

Then record missed pages, unnecessary edits, unsupported claims, and reviewer corrections. Include a change that affects a separate help article or website if that destination matters to you. Keep the source PR and resulting docs PR together so another reviewer can reproduce the assessment. Do not count the number of opened PRs as a quality score.

When updates fail or miss a page

If a merge produces no draft, check the configured repository, base branch, enabled triggers, watched paths, and destination access. Distinguish a no-change decision from a stopped run. If the tool missed a known affected page, correct the docs and review the source scope rather than assuming silence means accuracy.

If a draft states behavior you cannot verify, edit or reject it. If an incorrect change is already published, revert through the destination's normal Git workflow and confirm the corrected release is live. Preserve the source change and failed suggestion as an evaluation case.

Pause the relevant source or destination while resolving repeated failures. Record the last covered revision and review the intervening changes before treating a resumed workflow as complete. Confirm how your tool handles that interval. Existing PRs still need a decision from your team. Automation reduces discovery and drafting work, but an owner must still handle release timing, review, and recovery.

Start with one product source and one docs repository

Try the Track demo on your recent merged PRs, then compare its findings with the pages you expected to change. For ongoing automation, Thally Cloud includes Track and currently offers a 7-day trial without a credit card. Connect one source first, exercise the acceptance cases above, and expand destination scope when the drafts meet your team's bar. Assign a recurring owner review of stopped runs, uncovered intervals, and waiting PRs. Repeat the checks when source scope or release policy changes.

Sources and verification

Reviewed October 28, 2026 against the live Thally Track guide, Knowledge surfaces contract, and canonical pricing. Competitor workflows, including Mintlify Autopilot beta, were checked against the official sources linked above. The lifecycle and operating boundaries are editorial recommendations. The Acme rename and repeated-run worksheet are hypothetical acceptance examples with no executable SDK sample. This article does not claim a measured detection rate, time saving, or hands-on comparison. Read our editorial policy for the review process.