/**
 * AntiGravity-specific MCP registration step for `sklx agent install`
 * (SMI-6275 Wave 5, closing the last unshipped ask of GH#2166).
 *
 * Split out of `agent-pack-installer.harness.ts`'s generic `installMcpConfig`
 * for a STRUCTURAL reason (not just a per-harness-quirk reason like Cursor's
 * split): every other MCP-capable harness's config path is HOME-anchored
 * (`AGENT_MCP_TARGETS`, `agent-harness-targets.ts`) and resolved via
 * `relocateUnderHome()`. AntiGravity's `.agents/mcp_config.json` is
 * WORKSPACE-anchored — relative to the workspace root Wave 4
 * (`workspace-scope.ts`, ADR-139) resolves — so it cannot live in that
 * HOME-anchored `Record` at all, and never goes through `relocateUnderHome()`.
 * This module owns AntiGravity's path resolution + entry-value shape
 * entirely outside that table, mirroring the Cursor precedent
 * (`agent-pack-installer.cursor-mcp.ts`, SMI-6279 Wave 9) for the "give it
 * its own file" convention while differing in WHY: Cursor's shape/key both
 * diverge from the shared convention; AntiGravity's shape and key both MATCH
 * the shared convention (see {@link ANTIGRAVITY_MCP_ENTRY_KEY} and
 * `buildAntigravityMcpEntryValue()` in `agent-pack-installer.entry.ts}) — only
 * its PATH RESOLUTION diverges structurally.
 *
 * ## Schema verification (SMI-6275 Wave 5 Step 2 point 5)
 *
 * Confidence: **HIGH**. Verified 2026-08-30 via live web search against two
 * canonical Google sources (antigravity.google/docs/ide/mcp/ and
 * antigravity.google/docs/cli/mcp/), corroborated by two independent
 * third-party write-ups (a Google Cloud Community/Medium walkthrough and a
 * Composio how-to guide):
 *   - Path: `.agents/mcp_config.json`, workspace-local, discovered
 *     automatically by "the SDK" (AntiGravity's own phrasing) — sibling to
 *     the GLOBAL `~/.gemini/config/mcp_config.json` (itself a sibling of
 *     `CLIENT_NATIVE_PATHS.antigravity`'s `~/.gemini/config/skills`, `paths.ts`).
 *     Matches `docs/internal/research/smi-5386-opencode-antigravity-skill-dirs.md`'s
 *     already-verified `.agents/skills/` sibling convention for the same
 *     workspace root.
 *   - Schema: a single top-level `mcpServers` object — the SAME
 *     `mcpServers`-keyed convention claude-code/copilot/windsurf/hermes
 *     already use (NOT OpenCode's distinct `local|remote`-typed shape, NOT
 *     Codex's TOML block, NOT Cursor's resolved-binary-path form). Local/
 *     command-based servers are defined with `command` + `args` + optional
 *     `env` — exactly {@link buildAgentMcpEntryValue}'s existing shape, so
 *     `buildAntigravityMcpEntryValue()` composes over it rather than
 *     reinventing it.
 *   - This is reused, not novel: `mergeJsonMcpEntry()` (`agent-config-merge.json.ts`)
 *     already speaks this exact shape for four other harnesses — only the
 *     PATH (workspace-anchored) and the entry KEY (package-scoped, matching
 *     AntiGravity's own docs snippet — see `ANTIGRAVITY_MCP_ENTRY_KEY`) are
 *     new to this wave.
 *
 * @module @skillsmith/core/install/agent-pack-installer.antigravity-mcp
 */
import type { HarnessInstallCtx } from './agent-pack-installer.harness.js';
import type { HarnessInstallReport } from './agent-pack-installer.types.js';
/**
 * Relative path segments (from the resolved workspace root) to AntiGravity's
 * MCP config file. Exported as a fixed constant — not a hand-duplicated
 * string literal — so `agent-manifest-path-guard.ts`'s uninstall-time
 * allowlist check can validate against the EXACT same shape this module
 * writes, rather than an independently-maintained copy that could drift.
 */
export declare const ANTIGRAVITY_MCP_CONFIG_RELATIVE_SEGMENTS: readonly [".agents", "mcp_config.json"];
/**
 * Merge AntiGravity's MCP server registration into
 * `<workspaceRoot>/.agents/mcp_config.json` under
 * {@link ANTIGRAVITY_MCP_ENTRY_KEY}.
 *
 * Caller (`agent-pack-installer.ts`) is responsible for having already
 * confirmed `workspaceRoot` is a genuinely resolved AntiGravity workspace
 * scope (via `resolveScopedSkillsDir()`) — this function does no scope
 * resolution or detection of its own, per the "reuse Wave 4's resolver,
 * don't reimplement detection" requirement.
 */
export declare function installAntigravityMcpConfig(workspaceRoot: string, ctx: HarnessInstallCtx, report: HarnessInstallReport): void;
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