diff --git a/.gitignore b/.gitignore
index 83b6c05..794c235 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
-node_modules/\ndist/\n*.js.map\n*.d.ts.map
+node_modules/
+dist/
+*.js.map
+*.d.ts.map
diff --git a/src/index.ts b/src/index.ts
index 567dbde..b1f6e83 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,6 +7,11 @@ import { searchIssues, searchIssuesSchema } from "./tools/search-issues.js";
 import { upsertContext, upsertContextSchema } from "./tools/upsert-context.js";
 import { updateContext, updateContextSchema } from "./tools/update-context.js";
 import { deleteContext, deleteContextSchema } from "./tools/delete-context.js";
+import { listProjects, listProjectsSchema } from "./tools/list-projects.js";
+import { getProject, getProjectSchema } from "./tools/get-project.js";
+import { upsertProject, upsertProjectSchema } from "./tools/upsert-project.js";
+import { updateProject, updateProjectSchema } from "./tools/update-project.js";
+import { deleteProject, deleteProjectSchema } from "./tools/delete-project.js";
 
 const server = new McpServer({
   name: "homelab-mcp",
@@ -60,7 +65,7 @@ server.tool(
 
 server.tool(
   "update_context",
-  "Update metadata fields on existing homelab documentation chunk(s). Filter by host, source, or section. Optionally provide new text to trigger re-embedding.",
+  "Update metadata fields on existing homelab documentation chunk(s). Filter by host, source, section, or project. Optionally provide new text to trigger re-embedding.",
   updateContextSchema._def.schema.shape,
   async (input) => ({
     content: [{ type: "text", text: await updateContext(updateContextSchema.parse(input)) }],
@@ -69,13 +74,58 @@ server.tool(
 
 server.tool(
   "delete_context",
-  "Delete homelab documentation chunks matching a filter. At least one filter field (host, source, section) is required.",
+  "Delete homelab documentation chunks matching a filter. At least one filter field (host, source, section, project) is required.",
   deleteContextSchema._def.schema.shape,
   async (input) => ({
     content: [{ type: "text", text: await deleteContext(deleteContextSchema.parse(input)) }],
   }),
 );
 
+server.tool(
+  "list_projects",
+  "List all tracked projects. Filter by status (default: 'active', or 'all' for everything). Returns JSON array of project summaries.",
+  listProjectsSchema.shape,
+  async (input) => ({
+    content: [{ type: "text", text: await listProjects(listProjectsSchema.parse(input)) }],
+  }),
+);
+
+server.tool(
+  "get_project",
+  "Retrieve the full structured record for a project by slug. Returns all fields including relationships, blockers, history, and key facts.",
+  getProjectSchema.shape,
+  async (input) => ({
+    content: [{ type: "text", text: await getProject(getProjectSchema.parse(input)) }],
+  }),
+);
+
+server.tool(
+  "upsert_project",
+  "Create or update a project. On create, 'name' is required; other fields default to empty. On update, only provided fields are changed. Relationships merge at sub-key level (hosts, software, git_repos, local_dirs).",
+  upsertProjectSchema.shape,
+  async (input) => ({
+    content: [{ type: "text", text: await upsertProject(upsertProjectSchema.parse(input)) }],
+  }),
+);
+
+server.tool(
+  "update_project",
+  "Apply granular mutations to an existing project. Supports scalar updates (status, summary, current_state) and array add/remove operations (blockers, tags, key_facts, history, decisions_pending, relationships).",
+  updateProjectSchema.shape,
+  async (input) => ({
+    content: [{ type: "text", text: await updateProject(updateProjectSchema.parse(input)) }],
+  }),
+);
+
+server.tool(
+  "delete_project",
+  "Delete a project by slug. Removes the single project point from the database.",
+  deleteProjectSchema.shape,
+  async (input) => ({
+    content: [{ type: "text", text: await deleteProject(deleteProjectSchema.parse(input)) }],
+  }),
+);
+
 async function main() {
   const transport = new StdioServerTransport();
   await server.connect(transport);
diff --git a/src/lib/projects.ts b/src/lib/projects.ts
new file mode 100644
index 0000000..8c25484
--- /dev/null
+++ b/src/lib/projects.ts
@@ -0,0 +1,102 @@
+import { createHash } from "crypto";
+import { embed } from "./embeddings.js";
+import { getClient, COLLECTION } from "./qdrant.js";
+
+// --- Relationship types ---
+
+export interface HostRelationship {
+  host: string;
+  role: string;
+  description?: string;
+}
+
+export interface SoftwareRelationship {
+  name: string;
+  role: string;
+  version?: string;
+  description?: string;
+}
+
+export interface GitRepoRelationship {
+  repo: string;
+  path?: string;
+  role: string;
+  description?: string;
+}
+
+export interface LocalDirRelationship {
+  path: string;
+  role: string;
+  description?: string;
+}
+
+export interface ProjectRelationships {
+  hosts: HostRelationship[];
+  software: SoftwareRelationship[];
+  git_repos: GitRepoRelationship[];
+  local_dirs: LocalDirRelationship[];
+}
+
+// --- Project payload (stored as Qdrant point payload) ---
+
+export interface ProjectPayload {
+  slug: string;
+  name: string;
+  status: string;
+  summary: string;
+  tags: string[];
+  current_state: string;
+  blockers: string[];
+  decisions_pending: string[];
+  relationships: ProjectRelationships;
+  key_facts: string[];
+  history: string[];
+  updated: string;
+  type: "project";
+}
+
+// --- Helpers ---
+
+export function projectPointId(slug: string): string {
+  const hash = createHash("sha256").update(`project\0${slug}`).digest("hex");
+  return [
+    hash.slice(0, 8),
+    hash.slice(8, 12),
+    hash.slice(12, 16),
+    hash.slice(16, 20),
+    hash.slice(20, 32),
+  ].join("-");
+}
+
+export function buildEmbeddingText(payload: ProjectPayload): string {
+  const parts = [payload.summary, payload.current_state, ...payload.key_facts, ...payload.tags];
+  return parts.filter(Boolean).join(" ");
+}
+
+export function emptyRelationships(): ProjectRelationships {
+  return { hosts: [], software: [], git_repos: [], local_dirs: [] };
+}
+
+// --- Data access ---
+
+export async function getProjectPoint(slug: string): Promise<ProjectPayload | null> {
+  const client = getClient();
+  const id = projectPointId(slug);
+  try {
+    const points = await client.retrieve(COLLECTION, { ids: [id], with_payload: true, with_vector: false });
+    if (points.length === 0) return null;
+    return points[0].payload as unknown as ProjectPayload;
+  } catch {
+    return null;
+  }
+}
+
+export async function upsertProjectPoint(payload: ProjectPayload): Promise<string> {
+  const client = getClient();
+  const id = projectPointId(payload.slug);
+  const vector = await embed(buildEmbeddingText(payload));
+  await client.upsert(COLLECTION, {
+    points: [{ id, vector, payload: payload as unknown as Record<string, unknown> }],
+  });
+  return id;
+}
diff --git a/src/lib/qdrant.ts b/src/lib/qdrant.ts
index 13f7b05..153cc7a 100644
--- a/src/lib/qdrant.ts
+++ b/src/lib/qdrant.ts
@@ -18,8 +18,8 @@ export function getClient(): QdrantClient {
   return client;
 }
 
-export function deterministicId(source: string, section: string, host: string): string {
-  const hash = createHash("sha256").update(`${source}\0${section}\0${host}`).digest("hex");
+export function deterministicId(source: string, section: string, host: string, project: string = ""): string {
+  const hash = createHash("sha256").update(`${source}\0${section}\0${host}\0${project}`).digest("hex");
   return [
     hash.slice(0, 8),
     hash.slice(8, 12),
@@ -34,6 +34,7 @@ export interface ChunkPayload {
   section: string;
   type: string;
   host: string;
+  project?: string;
   tags: string[];
   updated: string;
   text: string;
diff --git a/src/tools/delete-context.ts b/src/tools/delete-context.ts
index 2ec9f10..3c43349 100644
--- a/src/tools/delete-context.ts
+++ b/src/tools/delete-context.ts
@@ -4,11 +4,12 @@ import { getClient, COLLECTION } from "../lib/qdrant.js";
 export const deleteContextSchema = z
   .object({
     host: z.string().optional().describe("Filter by hostname"),
+    project: z.string().optional().describe("Filter by project name"),
     source: z.string().optional().describe("Filter by source path"),
     section: z.string().optional().describe("Filter by section heading"),
   })
-  .refine((d) => d.host || d.source || d.section, {
-    message: "At least one filter field (host, source, section) is required",
+  .refine((d) => d.host || d.source || d.section || d.project, {
+    message: "At least one filter field (host, source, section, project) is required",
   });
 
 export type DeleteContextInput = z.infer<typeof deleteContextSchema>;
@@ -18,6 +19,7 @@ export async function deleteContext(input: DeleteContextInput): Promise<string>
 
   const must: Array<Record<string, unknown>> = [];
   if (input.host) must.push({ key: "host", match: { value: input.host } });
+  if (input.project) must.push({ key: "project", match: { value: input.project } });
   if (input.source) must.push({ key: "source", match: { value: input.source } });
   if (input.section) must.push({ key: "section", match: { value: input.section } });
 
diff --git a/src/tools/delete-project.ts b/src/tools/delete-project.ts
new file mode 100644
index 0000000..704d9bd
--- /dev/null
+++ b/src/tools/delete-project.ts
@@ -0,0 +1,22 @@
+import { z } from "zod";
+import { getClient, COLLECTION } from "../lib/qdrant.js";
+import { projectPointId, getProjectPoint } from "../lib/projects.js";
+
+export const deleteProjectSchema = z.object({
+  slug: z.string().describe("Project slug identifier to delete"),
+});
+
+export type DeleteProjectInput = z.infer<typeof deleteProjectSchema>;
+
+export async function deleteProject(input: DeleteProjectInput): Promise<string> {
+  const existing = await getProjectPoint(input.slug);
+  if (!existing) {
+    return `Project "${input.slug}" not found.`;
+  }
+
+  const client = getClient();
+  const id = projectPointId(input.slug);
+  await client.delete(COLLECTION, { points: [id] });
+
+  return `Deleted project "${existing.name}" (${input.slug}).`;
+}
diff --git a/src/tools/get-project.ts b/src/tools/get-project.ts
new file mode 100644
index 0000000..ea6eeb8
--- /dev/null
+++ b/src/tools/get-project.ts
@@ -0,0 +1,16 @@
+import { z } from "zod";
+import { getProjectPoint } from "../lib/projects.js";
+
+export const getProjectSchema = z.object({
+  slug: z.string().describe("Project slug identifier"),
+});
+
+export type GetProjectInput = z.infer<typeof getProjectSchema>;
+
+export async function getProject(input: GetProjectInput): Promise<string> {
+  const payload = await getProjectPoint(input.slug);
+  if (!payload) {
+    return `Project "${input.slug}" not found. Use list_projects to see available projects.`;
+  }
+  return JSON.stringify(payload, null, 2);
+}
diff --git a/src/tools/list-projects.ts b/src/tools/list-projects.ts
new file mode 100644
index 0000000..1fb67b1
--- /dev/null
+++ b/src/tools/list-projects.ts
@@ -0,0 +1,64 @@
+import { z } from "zod";
+import { getClient, COLLECTION } from "../lib/qdrant.js";
+import type { ProjectPayload } from "../lib/projects.js";
+
+export const listProjectsSchema = z.object({
+  status: z
+    .string()
+    .default("active")
+    .describe("Filter by project status (e.g. 'active', 'planning', 'completed', 'paused'), or 'all' to list every project"),
+  limit: z
+    .number()
+    .int()
+    .min(1)
+    .max(100)
+    .default(20)
+    .describe("Maximum number of projects to return"),
+});
+
+export type ListProjectsInput = z.infer<typeof listProjectsSchema>;
+
+export async function listProjects(input: ListProjectsInput): Promise<string> {
+  const client = getClient();
+  const results: Array<{ slug: string; name: string; status: string; summary: string; tags: string[]; updated: string }> = [];
+
+  const must: Array<Record<string, unknown>> = [{ key: "type", match: { value: "project" } }];
+  if (input.status !== "all") {
+    must.push({ key: "status", match: { value: input.status } });
+  }
+
+  let offset: string | number | Record<string, unknown> | undefined | null = undefined;
+  while (results.length < input.limit) {
+    const result = await client.scroll(COLLECTION, {
+      limit: Math.min(100, input.limit - results.length),
+      offset,
+      with_payload: ["slug", "name", "status", "summary", "tags", "updated"],
+      with_vector: false,
+      filter: { must },
+    });
+
+    for (const point of result.points) {
+      const p = point.payload as unknown as ProjectPayload;
+      results.push({
+        slug: p.slug,
+        name: p.name,
+        status: p.status,
+        summary: p.summary,
+        tags: p.tags ?? [],
+        updated: p.updated,
+      });
+      if (results.length >= input.limit) break;
+    }
+
+    if (!result.next_page_offset) break;
+    offset = result.next_page_offset;
+  }
+
+  if (results.length === 0) {
+    return input.status === "all"
+      ? "No projects found."
+      : `No projects with status "${input.status}" found.`;
+  }
+
+  return JSON.stringify(results, null, 2);
+}
diff --git a/src/tools/search-context.ts b/src/tools/search-context.ts
index c460a95..49e3bce 100644
--- a/src/tools/search-context.ts
+++ b/src/tools/search-context.ts
@@ -5,7 +5,7 @@ import { getClient, COLLECTION, type ChunkPayload } from "../lib/qdrant.js";
 export const searchContextSchema = z.object({
   query: z.string().describe("Natural language search query"),
   type: z
-    .enum(["device", "infrastructure", "network", "automation", "tool", "general"])
+    .enum(["device", "infrastructure", "network", "automation", "tool", "general", "project"])
     .optional()
     .describe("Filter by document type"),
   host: z.string().optional().describe("Filter by hostname"),
diff --git a/src/tools/update-context.ts b/src/tools/update-context.ts
index 3d9e2c9..8c46df7 100644
--- a/src/tools/update-context.ts
+++ b/src/tools/update-context.ts
@@ -5,20 +5,22 @@ import { getClient, COLLECTION, type ChunkPayload } from "../lib/qdrant.js";
 export const updateContextSchema = z
   .object({
     host: z.string().optional().describe("Filter by hostname"),
+    project: z.string().optional().describe("Filter by project name"),
     source: z.string().optional().describe("Filter by source path"),
     section: z.string().optional().describe("Filter by section heading"),
     new_tags: z.array(z.string()).optional().describe("Set tags"),
     new_type: z
-      .enum(["device", "infrastructure", "network", "automation", "tool", "general"])
+      .enum(["device", "infrastructure", "network", "automation", "tool", "general", "project"])
       .optional()
       .describe("Set document type"),
     new_source: z.string().optional().describe("Set source path"),
     new_section: z.string().optional().describe("Set section heading"),
     new_host: z.string().optional().describe("Set hostname"),
+    new_project: z.string().optional().describe("Set project name"),
     text: z.string().optional().describe("New content text (triggers re-embedding)"),
   })
-  .refine((d) => d.host || d.source || d.section, {
-    message: "At least one filter field (host, source, section) is required",
+  .refine((d) => d.host || d.source || d.section || d.project, {
+    message: "At least one filter field (host, source, section, project) is required",
   });
 
 export type UpdateContextInput = z.infer<typeof updateContextSchema>;
@@ -28,6 +30,7 @@ export async function updateContext(input: UpdateContextInput): Promise<string>
 
   const must: Array<Record<string, unknown>> = [];
   if (input.host) must.push({ key: "host", match: { value: input.host } });
+  if (input.project) must.push({ key: "project", match: { value: input.project } });
   if (input.source) must.push({ key: "source", match: { value: input.source } });
   if (input.section) must.push({ key: "section", match: { value: input.section } });
 
@@ -65,6 +68,7 @@ export async function updateContext(input: UpdateContextInput): Promise<string>
   if (input.new_source !== undefined) patch.source = input.new_source;
   if (input.new_section !== undefined) patch.section = input.new_section;
   if (input.new_host !== undefined) patch.host = input.new_host;
+  if (input.new_project !== undefined) patch.project = input.new_project;
 
   if (input.text !== undefined) {
     // Re-embed and full upsert for each point
diff --git a/src/tools/update-project.ts b/src/tools/update-project.ts
new file mode 100644
index 0000000..b03dd92
--- /dev/null
+++ b/src/tools/update-project.ts
@@ -0,0 +1,195 @@
+import { z } from "zod";
+import { getClient, COLLECTION } from "../lib/qdrant.js";
+import {
+  getProjectPoint,
+  projectPointId,
+  upsertProjectPoint,
+} from "../lib/projects.js";
+
+const addRelationshipSchema = z.discriminatedUnion("category", [
+  z.object({
+    category: z.literal("hosts"),
+    host: z.string(),
+    role: z.string(),
+    description: z.string().optional(),
+  }),
+  z.object({
+    category: z.literal("software"),
+    name: z.string(),
+    role: z.string(),
+    version: z.string().optional(),
+    description: z.string().optional(),
+  }),
+  z.object({
+    category: z.literal("git_repos"),
+    repo: z.string(),
+    path: z.string().optional(),
+    role: z.string(),
+    description: z.string().optional(),
+  }),
+  z.object({
+    category: z.literal("local_dirs"),
+    path: z.string(),
+    role: z.string(),
+    description: z.string().optional(),
+  }),
+]);
+
+const removeRelationshipSchema = z.discriminatedUnion("category", [
+  z.object({ category: z.literal("hosts"), host: z.string() }),
+  z.object({ category: z.literal("software"), name: z.string() }),
+  z.object({ category: z.literal("git_repos"), repo: z.string() }),
+  z.object({ category: z.literal("local_dirs"), path: z.string() }),
+]);
+
+export const updateProjectSchema = z.object({
+  slug: z.string().describe("Project slug identifier"),
+  // Scalar updates
+  status: z.string().optional().describe("New project status"),
+  current_state: z.string().optional().describe("New current state description"),
+  summary: z.string().optional().describe("New project summary"),
+  name: z.string().optional().describe("New project name"),
+  // Array add/remove operations
+  add_blocker: z.string().optional().describe("Add a blocker"),
+  remove_blocker: z.string().optional().describe("Remove a blocker"),
+  add_history: z.string().optional().describe("Append a history entry"),
+  add_key_fact: z.string().optional().describe("Add a key fact"),
+  remove_key_fact: z.string().optional().describe("Remove a key fact"),
+  add_tag: z.string().optional().describe("Add a tag"),
+  remove_tag: z.string().optional().describe("Remove a tag"),
+  add_decision_pending: z.string().optional().describe("Add a pending decision"),
+  remove_decision_pending: z.string().optional().describe("Remove a pending decision"),
+  add_relationship: addRelationshipSchema.optional().describe("Add a relationship"),
+  remove_relationship: removeRelationshipSchema.optional().describe("Remove a relationship"),
+});
+
+export type UpdateProjectInput = z.infer<typeof updateProjectSchema>;
+
+export async function updateProject(input: UpdateProjectInput): Promise<string> {
+  const payload = await getProjectPoint(input.slug);
+  if (!payload) {
+    return `Project "${input.slug}" not found.`;
+  }
+
+  let needsReembed = false;
+  const changes: string[] = [];
+
+  // Scalar updates
+  if (input.status !== undefined) {
+    payload.status = input.status;
+    changes.push(`status → ${input.status}`);
+  }
+  if (input.name !== undefined) {
+    payload.name = input.name;
+    changes.push(`name → ${input.name}`);
+  }
+  if (input.summary !== undefined) {
+    payload.summary = input.summary;
+    needsReembed = true;
+    changes.push("summary updated");
+  }
+  if (input.current_state !== undefined) {
+    payload.current_state = input.current_state;
+    needsReembed = true;
+    changes.push("current_state updated");
+  }
+
+  // Array mutations
+  if (input.add_blocker !== undefined) {
+    payload.blockers.push(input.add_blocker);
+    changes.push(`+blocker: ${input.add_blocker}`);
+  }
+  if (input.remove_blocker !== undefined) {
+    payload.blockers = payload.blockers.filter((b) => b !== input.remove_blocker);
+    changes.push(`-blocker: ${input.remove_blocker}`);
+  }
+  if (input.add_history !== undefined) {
+    payload.history.push(input.add_history);
+    changes.push(`+history: ${input.add_history}`);
+  }
+  if (input.add_key_fact !== undefined) {
+    payload.key_facts.push(input.add_key_fact);
+    needsReembed = true;
+    changes.push(`+key_fact: ${input.add_key_fact}`);
+  }
+  if (input.remove_key_fact !== undefined) {
+    payload.key_facts = payload.key_facts.filter((f) => f !== input.remove_key_fact);
+    needsReembed = true;
+    changes.push(`-key_fact: ${input.remove_key_fact}`);
+  }
+  if (input.add_tag !== undefined) {
+    payload.tags.push(input.add_tag);
+    needsReembed = true;
+    changes.push(`+tag: ${input.add_tag}`);
+  }
+  if (input.remove_tag !== undefined) {
+    payload.tags = payload.tags.filter((t) => t !== input.remove_tag);
+    needsReembed = true;
+    changes.push(`-tag: ${input.remove_tag}`);
+  }
+  if (input.add_decision_pending !== undefined) {
+    payload.decisions_pending.push(input.add_decision_pending);
+    changes.push(`+decision: ${input.add_decision_pending}`);
+  }
+  if (input.remove_decision_pending !== undefined) {
+    payload.decisions_pending = payload.decisions_pending.filter((d) => d !== input.remove_decision_pending);
+    changes.push(`-decision: ${input.remove_decision_pending}`);
+  }
+
+  // Relationship mutations
+  if (input.add_relationship) {
+    const r = input.add_relationship;
+    switch (r.category) {
+      case "hosts":
+        payload.relationships.hosts.push({ host: r.host, role: r.role, description: r.description });
+        break;
+      case "software":
+        payload.relationships.software.push({ name: r.name, role: r.role, version: r.version, description: r.description });
+        break;
+      case "git_repos":
+        payload.relationships.git_repos.push({ repo: r.repo, path: r.path, role: r.role, description: r.description });
+        break;
+      case "local_dirs":
+        payload.relationships.local_dirs.push({ path: r.path, role: r.role, description: r.description });
+        break;
+    }
+    changes.push(`+relationship: ${r.category}`);
+  }
+  if (input.remove_relationship) {
+    const r = input.remove_relationship;
+    switch (r.category) {
+      case "hosts":
+        payload.relationships.hosts = payload.relationships.hosts.filter((h) => h.host !== r.host);
+        break;
+      case "software":
+        payload.relationships.software = payload.relationships.software.filter((s) => s.name !== r.name);
+        break;
+      case "git_repos":
+        payload.relationships.git_repos = payload.relationships.git_repos.filter((g) => g.repo !== r.repo);
+        break;
+      case "local_dirs":
+        payload.relationships.local_dirs = payload.relationships.local_dirs.filter((d) => d.path !== r.path);
+        break;
+    }
+    changes.push(`-relationship: ${r.category}`);
+  }
+
+  if (changes.length === 0) {
+    return "No changes provided.";
+  }
+
+  payload.updated = new Date().toISOString();
+
+  if (needsReembed) {
+    await upsertProjectPoint(payload);
+  } else {
+    const client = getClient();
+    const id = projectPointId(input.slug);
+    await client.setPayload(COLLECTION, {
+      payload: payload as unknown as Record<string, unknown>,
+      points: [id],
+    });
+  }
+
+  return `Updated project "${payload.name}" (${input.slug}): ${changes.join(", ")}`;
+}
diff --git a/src/tools/upsert-context.ts b/src/tools/upsert-context.ts
index 1b93dbd..d625e8f 100644
--- a/src/tools/upsert-context.ts
+++ b/src/tools/upsert-context.ts
@@ -11,9 +11,10 @@ export const upsertContextSchema = z.object({
   source: z.string().describe("Source path, e.g. 'devices/proxmox.md'"),
   section: z.string().describe("Section heading"),
   type: z
-    .enum(["device", "infrastructure", "network", "automation", "tool", "general"])
+    .enum(["device", "infrastructure", "network", "automation", "tool", "general", "project"])
     .describe("Document type"),
   host: z.string().describe("Hostname"),
+  project: z.string().optional().describe("Project name"),
   tags: z.array(z.string()).default([]).describe("Optional tags"),
   text: z.string().describe("Content text"),
 });
@@ -21,7 +22,7 @@ export const upsertContextSchema = z.object({
 export type UpsertContextInput = z.infer<typeof upsertContextSchema>;
 
 export async function upsertContext(input: UpsertContextInput): Promise<string> {
-  const pointId = deterministicId(input.source, input.section, input.host);
+  const pointId = deterministicId(input.source, input.section, input.host, input.project ?? "");
   const vector = await embed(input.text);
   const client = getClient();
 
@@ -30,6 +31,7 @@ export async function upsertContext(input: UpsertContextInput): Promise<string>
     section: input.section,
     type: input.type,
     host: input.host,
+    ...(input.project ? { project: input.project } : {}),
     tags: input.tags,
     updated: new Date().toISOString(),
     text: input.text,
diff --git a/src/tools/upsert-project.ts b/src/tools/upsert-project.ts
new file mode 100644
index 0000000..4259cb2
--- /dev/null
+++ b/src/tools/upsert-project.ts
@@ -0,0 +1,85 @@
+import { z } from "zod";
+import {
+  getProjectPoint,
+  upsertProjectPoint,
+  emptyRelationships,
+  type ProjectPayload,
+  type ProjectRelationships,
+} from "../lib/projects.js";
+
+const relationshipSchema = z.object({
+  hosts: z.array(z.object({ host: z.string(), role: z.string(), description: z.string().optional() })).optional(),
+  software: z.array(z.object({ name: z.string(), role: z.string(), version: z.string().optional(), description: z.string().optional() })).optional(),
+  git_repos: z.array(z.object({ repo: z.string(), path: z.string().optional(), role: z.string(), description: z.string().optional() })).optional(),
+  local_dirs: z.array(z.object({ path: z.string(), role: z.string(), description: z.string().optional() })).optional(),
+});
+
+export const upsertProjectSchema = z.object({
+  slug: z.string().describe("Project slug identifier (kebab-case)"),
+  name: z.string().optional().describe("Human-readable project name (required on create)"),
+  status: z.string().optional().describe("Project status (e.g. planning, active, completed, paused)"),
+  summary: z.string().optional().describe("Brief project summary"),
+  tags: z.array(z.string()).optional().describe("Project tags"),
+  current_state: z.string().optional().describe("Current state description"),
+  blockers: z.array(z.string()).optional().describe("Current blockers"),
+  decisions_pending: z.array(z.string()).optional().describe("Pending decisions"),
+  relationships: relationshipSchema.optional().describe("Project relationships (replaces at sub-key level)"),
+  key_facts: z.array(z.string()).optional().describe("Key facts about the project"),
+  history: z.array(z.string()).optional().describe("History entries"),
+});
+
+export type UpsertProjectInput = z.infer<typeof upsertProjectSchema>;
+
+export async function upsertProject(input: UpsertProjectInput): Promise<string> {
+  const existing = await getProjectPoint(input.slug);
+
+  if (!existing && !input.name) {
+    return `Project "${input.slug}" does not exist. Provide "name" to create a new project.`;
+  }
+
+  const base: ProjectPayload = existing ?? {
+    slug: input.slug,
+    name: "",
+    status: "planning",
+    summary: "",
+    tags: [],
+    current_state: "",
+    blockers: [],
+    decisions_pending: [],
+    relationships: emptyRelationships(),
+    key_facts: [],
+    history: [],
+    updated: "",
+    type: "project",
+  };
+
+  // Merge scalar fields
+  const merged: ProjectPayload = {
+    ...base,
+    ...(input.name !== undefined && { name: input.name }),
+    ...(input.status !== undefined && { status: input.status }),
+    ...(input.summary !== undefined && { summary: input.summary }),
+    ...(input.tags !== undefined && { tags: input.tags }),
+    ...(input.current_state !== undefined && { current_state: input.current_state }),
+    ...(input.blockers !== undefined && { blockers: input.blockers }),
+    ...(input.decisions_pending !== undefined && { decisions_pending: input.decisions_pending }),
+    ...(input.key_facts !== undefined && { key_facts: input.key_facts }),
+    ...(input.history !== undefined && { history: input.history }),
+    updated: new Date().toISOString(),
+    type: "project",
+  };
+
+  // Merge relationships at sub-key level
+  if (input.relationships) {
+    const rel: ProjectRelationships = { ...base.relationships };
+    if (input.relationships.hosts !== undefined) rel.hosts = input.relationships.hosts;
+    if (input.relationships.software !== undefined) rel.software = input.relationships.software;
+    if (input.relationships.git_repos !== undefined) rel.git_repos = input.relationships.git_repos;
+    if (input.relationships.local_dirs !== undefined) rel.local_dirs = input.relationships.local_dirs;
+    merged.relationships = rel;
+  }
+
+  const id = await upsertProjectPoint(merged);
+  const verb = existing ? "Updated" : "Created";
+  return `${verb} project "${merged.name}" (${input.slug}) [${id}]`;
+}