Enabling fullsend on private repositories

This guide covers what administrators need to configure when enabling fullsend on private repositories. Admin access to the target private repository is required.

Supported scenarios

A per-repo install is self-contained. The fullsend workflow shim lives inside the target repo under .fullsend/, and it calls the public action workflows in the upstream fullsend-ai/fullsend repository directly. Because the caller and the called workflow are in the same repo (or the called repo is public), there are no cross-repo visibility constraints. Per-repo install works for any private repo on any GitHub plan.

How private repos differ from public repos

Fullsend treats all repositories the same at the infrastructure level — the same agents, harness, and pipeline run regardless of visibility. The differences are operational, not architectural:

1. Information disclosure risk. Agents process repository content (code, issues, PR descriptions) and produce output (comments, commits, filed issues) that may reference that content. In a public repo this is harmless — the content is already public. In a private repo, agent output that crosses a visibility boundary (e.g., an issue filed in a public repository) can leak private information. See #1189 for a concrete example involving the retro agent.

2. Sensitive data exposure. Private repos are more likely to contain credentials, PII, internal hostnames, or proprietary logic. Agents may reproduce this content in their output — not because they are instructed to, but because quoting context is a natural part of code review, triage summaries, and retrospective analysis. The security threat model documents how indirect disclosure bypasses content-level guardrails.

Which agents are safe to enable by default

All agents are designed to operate safely, but some produce output with higher disclosure risk when processing private repos:

Agent	Default risk	Notes
triage	Low	Output stays within the source repo (labels, comments on the triggering issue). No cross-repo disclosure.
coder	Low	Commits and PR descriptions stay within the source repo.
review	Low	Review comments stay within the source repo's PR.
retro	Higher	Files improvement issues that may target a different repo. If the target repo has broader visibility than the source, private content can leak. See #1189.
prioritize	Higher	Analyzes issues across repos and may produce cross-repo summaries. If summaries reference private repo content, the same disclosure risk applies.

Recommendation: Start with triage, coder, and review on private repos. Enable retro and prioritize only after configuring the guardrails described below.

To limit which agents run, edit the roles list in config.yaml:

• Per-repo install: .fullsend/config.yaml in the target repo. List only the roles you want enabled:

  version: "1"
  roles: [triage, coder, review]   # retro and prioritize omitted

Roles omitted from the list are not dispatched — the dispatcher blocks them before any agent runs.

Configuring AGENTS.md for private repos

The AGENTS.md file in a repository provides instructions that all agents follow. For private repos, add guidance that prevents agents from reproducing sensitive content in their output.

Example: preventing sensitive content reproduction

Add the following section to your private repo's AGENTS.md:

## Private repository rules

This is a private repository. When producing output (comments, issues,
commit messages, PR descriptions), follow these rules:

1. **Do not quote credentials, tokens, API keys, or secrets** — even if
   they appear in the code you are analyzing. Reference them by variable
   name (e.g., "the `DB_PASSWORD` environment variable") rather than by
   value.

2. **Do not reproduce internal hostnames, IP addresses, or service
   URLs** in output that may be visible outside this repository. Use
   placeholders (e.g., `internal-service.example.com`) when describing
   architecture.

3. **Summarize rather than quote** when referencing code that contains
   proprietary logic. Describe what the code does, not what it says.

4. **Do not include file paths that reveal internal project structure**
   in issues filed outside this repository. Describe the component
   abstractly (e.g., "the authentication module") rather than by path.

Example: restricting retro agent output

If the retro agent is enabled, add specific guidance for cross-visibility filing:

## Retro agent: cross-repo filing

When filing improvement issues based on work in this repository:

1. **Abstract all findings.** Describe patterns and improvements
   generically. Do not include file paths, function names, variable
   names, or code snippets from this repository.

2. **Do not reference internal infrastructure** — hostnames, service
   names, deployment targets, or configuration values must not appear
   in issues filed to public repositories.

3. **Frame improvements as general patterns.** Instead of "the
   `AuthService.validateToken()` method in `internal/auth/` should
   use constant-time comparison," write "token validation should use
   constant-time comparison to prevent timing attacks."

Testing that guardrails are working

After configuring AGENTS.md and enabling agents on a private repo, verify that the guardrails prevent information disclosure.

1. Create a test issue with sensitive context

File an issue in your private repo that references internal details:

## Bug report

The endpoint at `https://api.internal.example.com:8443/v2/auth`
returns a 500 when called with the service account
`svc-pipeline@project.iam.gserviceaccount.com`. The error log
shows the database connection string includes the password in
cleartext.

2. Verify triage output

After the triage agent processes the issue, review its comment:

• Does it quote the internal hostname verbatim, or describe it abstractly?
• Does it reproduce the service account identifier?
• Does the triage summary avoid including the database connection detail?

3. Test cross-repo agents (if enabled)

If the retro agent is enabled, trigger it on a merged PR and check the filed issue:

• Is the issue filed in a repo with broader visibility?
• Does the issue body contain file paths, function names, or code from the private repo?
• Are findings described as general patterns rather than repo-specific details?

4. Review Actions logs

Check the GitHub Actions logs for agent runs in the target repo:

• Do log outputs contain sensitive values from the private repo?
• Are the harness-level secret redaction and output scanning working as expected?

Note: Agent output goes through the harness-level SecretRedactor pipeline before being applied. This catches known secret patterns but cannot catch all forms of sensitive content — AGENTS.md instructions are your primary defense for context-specific information.

What should not be deployed based on data sensitivity

Not all private repos are equal. A repo containing open-source code that happens to be private (e.g., pre-release) has different risk than a repo containing PII, financial data, or security credentials.

High-sensitivity repos (PII, credentials, financial data)

• Enable only: triage, coder, review
• Disable: retro, prioritize (any agent that produces cross-repo output)
• Require: AGENTS.md with the private repository rules above

Medium-sensitivity repos (proprietary code, internal tooling)

• Enable: triage, coder, review
• Enable with caution: retro, prioritize — only if AGENTS.md guardrails are configured and tested
• Require: AGENTS.md with at minimum the sensitive-content-reproduction rules

Low-sensitivity repos (pre-release public code, internal docs)

• Enable: all agents
• Recommended: AGENTS.md with basic private-repo rules as defense in depth

See also

• Getting Started — Initial fullsend setup
• Configuring agent behavior — Harness configuration and layered overrides
• Security threat model — Threat priority and defense considerations
• #1189 — Retro agent private content leak risk