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+# Phase 05 — Config swap
+
+**Estimated time:** ~10 minutes
+**Touches:** `lib/dispatch/adapter/minimax.rb`.
+
+## Goal
+
+Swap the four configuration constants in `lib/dispatch/adapter/minimax.rb`
+so the adapter targets MiniMax instead of Anthropic.
+
+| Constant | Old value | New value |
+|---|---|---|
+| `DEFAULT_BASE_URL` | `"https://api.anthropic.com"` | `"https://api.minimax.io/anthropic"` |
+| `DEFAULT_MODEL` | `"claude-sonnet-4-5-20250929"` (or whatever) | `"MiniMax-M2.7"` |
+| `MESSAGES_PATH` | `"/v1/messages"` | `"/v1/messages"` (UNCHANGED) |
+| `COUNT_TOKENS_PATH` | `"/v1/messages/count_tokens"` | `"/v1/messages/count_tokens"` (UNCHANGED) |
+| `MODELS_PATH` | `"/v1/models"` | `"/v1/models"` (UNCHANGED) |
+
+The path constants stay because MiniMax mirrors the Anthropic SDK's URL
+shape. Only the host changes.
+
+## Steps
+
+### 1. Update `DEFAULT_BASE_URL`
+
+Find the constant declaration in `lib/dispatch/adapter/minimax.rb`:
+
+```ruby
+DEFAULT_BASE_URL = "https://api.anthropic.com"
+```
+
+Change it to:
+
+```ruby
+DEFAULT_BASE_URL = "https://api.minimax.io/anthropic"
+```
+
+### 2. Update `DEFAULT_MODEL`
+
+Find:
+
+```ruby
+DEFAULT_MODEL = "claude-sonnet-4-5-20250929"
+```
+
+(The exact string may differ — find whatever the current default is.)
+
+Change it to:
+
+```ruby
+DEFAULT_MODEL = "MiniMax-M2.7"
+```
+
+### 3. Verify path constants are present
+
+Confirm the gem still defines (do NOT change them):
+
+- `MESSAGES_PATH = "/v1/messages"`
+- `COUNT_TOKENS_PATH = "/v1/messages/count_tokens"`
+- `MODELS_PATH = "/v1/models"`
+
+If any of these are inlined as strings in method bodies rather than
+constants, leave them inlined — do not refactor.
+
+### 4. Update any `DEFAULT_BASE_URL` or `DEFAULT_MODEL` references in specs
+
+Run `grep -rn 'api.anthropic.com\|claude-sonnet-4' spec/`. For every
+match in a spec file:
+
+- If the spec is asserting the *old* default value, update the assertion
+  to the new value.
+- If the spec is using the URL/model in a `stub_request` for an
+  Anthropic-shaped fixture, leave the stub alone for now — fixture work
+  is in phase 12 and spec retargets are in phases 13–16.
+
+You may NOT delete or weaken any spec to make it pass. Only update
+hardcoded references that genuinely must follow the constant rename.
+
+## Acceptance criteria
+
+- `grep -rn 'https://api.anthropic.com' lib/` returns ZERO matches.
+- `grep -rn 'claude-sonnet' lib/` returns ZERO matches.
+- `DEFAULT_BASE_URL == "https://api.minimax.io/anthropic"` (verified by
+  `bundle exec ruby -e 'require "./lib/dispatch/adapter/minimax"; \
+   puts Dispatch::Adapter::MiniMax::DEFAULT_BASE_URL'`).
+- `DEFAULT_MODEL == "MiniMax-M2.7"`.
+- `bundle exec rubocop --autocorrect-all` exits 0.
+
+## Verification
+
+Run `run_tests` with `project_path=reference/dispatch-adapter-minimax`.
+Rubocop must be clean. RSpec failures from fixtures and specs that still
+reference Anthropic URLs are acceptable — they're cleaned up in phases
+12–16. RSpec failures NOT explainable by Anthropic URL/model references
+must be investigated and fixed before calling `ask_for_next_plan`.