Copilot CLI: Update CLI command-line options reference (#61787)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

Author: 3 people

content/copilot/reference/copilot-cli-reference/cli-command-reference.md

@@ -278,11 +278,15 @@ For a complete list of available slash commands enter `/help` in the CLI's inter
 | `--allow-all-urls`                 | Allow access to all URLs without confirmation. |
 | `--allow-tool=TOOL ...`            | Tools the CLI has permission to use. Will not prompt for permission. For multiple tools, use a quoted, comma-separated list. See [AUTOTITLE](/copilot/how-tos/copilot-cli/allowing-tools#allowing-or-denying-permission-for-specific-tools). |
 | `--allow-url=URL ...`              | Allow access to specific URLs or domains. For multiple URLs, use a quoted, comma-separated list. |
+| `--acp`                            | Start as Agent Client Protocol server. |
+| `--attachment PATH`                | Attach a file to the initial prompt (can be used multiple times). Image files are accepted, but sending them successfully requires the selected model and organization policy to allow vision input. |
 | `--autopilot`                      | Enable autopilot continuation in prompt mode. See [AUTOTITLE](/copilot/concepts/agents/copilot-cli/autopilot). |
 | `--available-tools=TOOL ...`       | Only these tools will be available to the model. For multiple tools, use a quoted, comma-separated list. See [AUTOTITLE](/copilot/how-tos/copilot-cli/allowing-tools). |
 | `--banner`, `--no-banner`          | Show or hide the startup banner. |
 | `--bash-env`                       | Enable `BASH_ENV` support for bash shells. |
+| `-C DIRECTORY`                     | Change working directory before doing anything else. |
 | `--connect[=SESSION-ID]`           | Connect directly to a remote session (optionally specify a session ID or task ID). Conflicts with `--resume` and `--continue`. |
+| `--context TIER`.                  | Set the context window tier (overrides the persisted setting). Choices: "default", "long_context". |
 | `--config-dir=DIRECTORY`           | This option for setting the configuration directory is deprecated. Use the `COPILOT_HOME` environment variable instead. | <!-- markdownlint-disable-line GHD046 -->
 | `--continue`                       | Resume the most recent session in the current working directory, falling back to the globally most recent session. |
 | `--deny-tool=TOOL ...`             | Tools the CLI does not have permission to use. Will not prompt for permission. For multiple tools, use a quoted, comma-separated list. |
@@ -292,9 +296,11 @@ For a complete list of available slash commands enter `/help` in the CLI's inter
 | `--disallow-temp-dir`              | Prevent automatic access to the system temporary directory. |
 | `--effort=LEVEL`, `--reasoning-effort=LEVEL` | Set the reasoning effort level (`low`, `medium`, `high`, `xhigh`, `max`). `max` is the highest-depth tier for Anthropic models. |
 | `--enable-all-github-mcp-tools`    | Enable all {% data variables.product.github %} MCP server tools, instead of the default CLI subset. Overrides the `--add-github-mcp-toolset` and `--add-github-mcp-tool` options. |
+| `--enable-memory`                  | Enable memory in prompt mode (disabled by default). |
 | `--enable-reasoning-summaries`     | Request reasoning summaries for OpenAI models that support it. |
 | `--excluded-tools=TOOL ...`        | These tools will not be available to the model. For multiple tools, use a quoted, comma-separated list. |
 | `--experimental`                   | Enable experimental features (use `--no-experimental` to disable). |
+| `--extension-sdk-path DIRECTORY`   | Override the bundled `@github/copilot-sdk` injected into extension subprocesses with a local `copilot-sdk/` folder. Invalid paths fall back to the bundled SDK. |
 | `-h`, `--help`                     | Display help. |
 | `-i PROMPT`, `--interactive=PROMPT`  | Start an interactive session and automatically execute this prompt. |
 | `--log-dir=DIRECTORY`              | Set the log file directory (default: `~/.copilot/logs/`). |
@@ -322,6 +328,7 @@ For a complete list of available slash commands enter `/help` in the CLI's inter
 | `-s`, `--silent`                   | Output only the agent response (without usage statistics), useful for scripting with `-p`. |
 | `--screen-reader`                  | Enable screen reader optimizations. |
 | `--secret-env-vars=VAR ...`        | Redact an environment variable from shell and MCP server environments (can be used multiple times). For multiple variables, use a quoted, comma-separated list. The values in the `GITHUB_TOKEN` and `COPILOT_GITHUB_TOKEN` environment variables are redacted from output by default. |
+| `--session-id ID`                  | Use an exact session or task ID when you do not want `--resume`'s broader matching by ID prefix or session name. If the ID matches an existing session or task, that session or task is resumed. If nothing matches, a new session is created only when the value is a valid UUID. Names and ID prefixes do not create new sessions. Do not combine this option with other session-selection or session-starting options such as `--resume`, `--continue`, or `--connect`, because they compete to decide which session to open or create. |
 | `--share=PATH`                     | Share a session to a Markdown file after completion of a programmatic session (default path: `./copilot-session-<ID>.md`). |
 | `--share-gist`                     | Share a session to a secret {% data variables.product.github %} gist after completion of a programmatic session. |
 | `--stream=MODE`                    | Enable or disable streaming mode, which displays {% data variables.product.prodname_copilot_short %}'s response progressively as it is generated rather than waiting for the full response to arrive (mode choices: `on` or `off`, default: `on`).