diff --git a/doc/COLIBRI-PI-CONTROL-PLAN.md b/doc/COLIBRI-PI-CONTROL-PLAN.md
index b181c9b..77c1413 100644
--- a/doc/COLIBRI-PI-CONTROL-PLAN.md
+++ b/doc/COLIBRI-PI-CONTROL-PLAN.md
@@ -129,6 +129,13 @@ Suggested phases:
 5. **Herdr Linux display** — optional rendering/control surface only.
 6. **Deprecation PRs** — remove legacy paths only after gates pass.
 
+Initial implementation modules:
+
+- `src/colibri-pi-events.ts` — pure parser/normalizer for Pi `--mode json`
+  JSONL events. No FreeBSD dependency, so Linux agents can test it.
+- `src/colibri-run-manifest.ts` — validator and compact renderer for
+  cross-host interagent run manifests.
+
 ## Non-Goals For This Branch
 
 - No Herdr FreeBSD port.
diff --git a/src/colibri-pi-events.test.ts b/src/colibri-pi-events.test.ts
new file mode 100644
index 0000000..272372d
--- /dev/null
+++ b/src/colibri-pi-events.test.ts
@@ -0,0 +1,107 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  normalizePiJsonEvent,
+  parsePiJsonLine,
+  parsePiJsonLines,
+} from './colibri-pi-events.js';
+
+const OBSERVED_AT = '2026-05-14T12:00:00.000Z';
+
+describe('colibri pi event parsing', () => {
+  it('normalizes the pi session header', () => {
+    const event = normalizePiJsonEvent(
+      {
+        type: 'session',
+        version: 3,
+        id: 'session-1',
+        cwd: '/repo',
+      },
+      OBSERVED_AT,
+    );
+
+    expect(event).toMatchObject({
+      source: 'pi-json',
+      kind: 'pi.session_started',
+      observedAt: OBSERVED_AT,
+      piType: 'session',
+      sessionId: 'session-1',
+      cwd: '/repo',
+    });
+  });
+
+  it('extracts text deltas from message updates', () => {
+    const result = parsePiJsonLine(
+      JSON.stringify({
+        type: 'message_update',
+        assistantMessageEvent: { type: 'text_delta', delta: 'hello' },
+      }),
+      OBSERVED_AT,
+    );
+
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.event.kind).toBe('pi.message_text_delta');
+    expect(result.event.textDelta).toBe('hello');
+  });
+
+  it('normalizes tool lifecycle events', () => {
+    const result = parsePiJsonLine(
+      JSON.stringify({
+        type: 'tool_execution_end',
+        toolCallId: 'call-1',
+        toolName: 'bash',
+        isError: true,
+      }),
+      OBSERVED_AT,
+    );
+
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.event).toMatchObject({
+      kind: 'pi.tool_finished',
+      toolCallId: 'call-1',
+      toolName: 'bash',
+      toolIsError: true,
+    });
+  });
+
+  it('keeps unknown pi event types without failing', () => {
+    const result = parsePiJsonLine(
+      JSON.stringify({ type: 'future_event', value: 1 }),
+      OBSERVED_AT,
+    );
+
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.event.kind).toBe('pi.unknown');
+    expect(result.event.piType).toBe('future_event');
+    expect(result.event.raw).toMatchObject({ value: 1 });
+  });
+
+  it('reports malformed JSON lines', () => {
+    const result = parsePiJsonLine('{not-json', OBSERVED_AT);
+
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.error).toContain('invalid JSON');
+  });
+
+  it('parses newline-delimited pi events', () => {
+    const results = parsePiJsonLines(
+      [
+        JSON.stringify({ type: 'agent_start' }),
+        JSON.stringify({ type: 'turn_start' }),
+        JSON.stringify({ type: 'turn_end' }),
+      ].join('\n'),
+      OBSERVED_AT,
+    );
+
+    expect(results).toHaveLength(3);
+    expect(results.map((result) => (result.ok ? result.event.kind : 'error'))).toEqual([
+      'pi.agent_started',
+      'pi.turn_started',
+      'pi.turn_finished',
+    ]);
+  });
+});
diff --git a/src/colibri-pi-events.ts b/src/colibri-pi-events.ts
new file mode 100644
index 0000000..4b8a726
--- /dev/null
+++ b/src/colibri-pi-events.ts
@@ -0,0 +1,192 @@
+export type ColibriPiEventKind =
+  | 'pi.session_started'
+  | 'pi.agent_started'
+  | 'pi.agent_finished'
+  | 'pi.turn_started'
+  | 'pi.turn_finished'
+  | 'pi.message_started'
+  | 'pi.message_text_delta'
+  | 'pi.message_finished'
+  | 'pi.tool_started'
+  | 'pi.tool_updated'
+  | 'pi.tool_finished'
+  | 'pi.queue_updated'
+  | 'pi.compaction_started'
+  | 'pi.compaction_finished'
+  | 'pi.retry_started'
+  | 'pi.retry_finished'
+  | 'pi.unknown';
+
+export interface ColibriPiEvent {
+  source: 'pi-json';
+  kind: ColibriPiEventKind;
+  observedAt: string;
+  piType: string;
+  sessionId?: string;
+  cwd?: string;
+  turnStatus?: 'started' | 'finished';
+  toolCallId?: string;
+  toolName?: string;
+  toolIsError?: boolean;
+  textDelta?: string;
+  queue?: {
+    steering: string[];
+    followUp: string[];
+  };
+  raw: Record<string, unknown>;
+}
+
+export type ColibriPiParseResult =
+  | { ok: true; event: ColibriPiEvent }
+  | { ok: false; error: string; line: string };
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
+function stringValue(value: unknown): string | undefined {
+  return typeof value === 'string' ? value : undefined;
+}
+
+function stringArrayValue(value: unknown): string[] {
+  if (!Array.isArray(value)) return [];
+  return value.filter((entry): entry is string => typeof entry === 'string');
+}
+
+function nowIso(): string {
+  return new Date().toISOString();
+}
+
+export function normalizePiJsonEvent(
+  raw: Record<string, unknown>,
+  observedAt: string = nowIso(),
+): ColibriPiEvent {
+  const piType = stringValue(raw.type) ?? 'unknown';
+  const base: ColibriPiEvent = {
+    source: 'pi-json',
+    kind: 'pi.unknown',
+    observedAt,
+    piType,
+    raw,
+  };
+
+  if (piType === 'session') {
+    return {
+      ...base,
+      kind: 'pi.session_started',
+      sessionId: stringValue(raw.id),
+      cwd: stringValue(raw.cwd),
+    };
+  }
+
+  if (piType === 'agent_start') return { ...base, kind: 'pi.agent_started' };
+  if (piType === 'agent_end') return { ...base, kind: 'pi.agent_finished' };
+  if (piType === 'turn_start') {
+    return { ...base, kind: 'pi.turn_started', turnStatus: 'started' };
+  }
+  if (piType === 'turn_end') {
+    return { ...base, kind: 'pi.turn_finished', turnStatus: 'finished' };
+  }
+  if (piType === 'message_start') return { ...base, kind: 'pi.message_started' };
+  if (piType === 'message_end') return { ...base, kind: 'pi.message_finished' };
+
+  if (piType === 'message_update') {
+    const update = isRecord(raw.assistantMessageEvent)
+      ? raw.assistantMessageEvent
+      : undefined;
+    if (update?.type === 'text_delta') {
+      return {
+        ...base,
+        kind: 'pi.message_text_delta',
+        textDelta: stringValue(update.delta) ?? '',
+      };
+    }
+    return base;
+  }
+
+  if (piType === 'tool_execution_start') {
+    return {
+      ...base,
+      kind: 'pi.tool_started',
+      toolCallId: stringValue(raw.toolCallId),
+      toolName: stringValue(raw.toolName),
+    };
+  }
+
+  if (piType === 'tool_execution_update') {
+    return {
+      ...base,
+      kind: 'pi.tool_updated',
+      toolCallId: stringValue(raw.toolCallId),
+      toolName: stringValue(raw.toolName),
+    };
+  }
+
+  if (piType === 'tool_execution_end') {
+    return {
+      ...base,
+      kind: 'pi.tool_finished',
+      toolCallId: stringValue(raw.toolCallId),
+      toolName: stringValue(raw.toolName),
+      toolIsError: raw.isError === true,
+    };
+  }
+
+  if (piType === 'queue_update') {
+    return {
+      ...base,
+      kind: 'pi.queue_updated',
+      queue: {
+        steering: stringArrayValue(raw.steering),
+        followUp: stringArrayValue(raw.followUp),
+      },
+    };
+  }
+
+  if (piType === 'compaction_start') {
+    return { ...base, kind: 'pi.compaction_started' };
+  }
+  if (piType === 'compaction_end') {
+    return { ...base, kind: 'pi.compaction_finished' };
+  }
+  if (piType === 'auto_retry_start') {
+    return { ...base, kind: 'pi.retry_started' };
+  }
+  if (piType === 'auto_retry_end') {
+    return { ...base, kind: 'pi.retry_finished' };
+  }
+
+  return base;
+}
+
+export function parsePiJsonLine(
+  line: string,
+  observedAt: string = nowIso(),
+): ColibriPiParseResult {
+  const trimmed = line.trim();
+  if (!trimmed) return { ok: false, error: 'empty line', line };
+
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(trimmed);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return { ok: false, error: `invalid JSON: ${message}`, line };
+  }
+
+  if (!isRecord(parsed)) {
+    return { ok: false, error: 'JSON line is not an object', line };
+  }
+
+  return { ok: true, event: normalizePiJsonEvent(parsed, observedAt) };
+}
+
+export function parsePiJsonLines(
+  text: string,
+  observedAt: string = nowIso(),
+): ColibriPiParseResult[] {
+  return text
+    .split(/\r?\n/u)
+    .filter((line) => line.trim().length > 0)
+    .map((line) => parsePiJsonLine(line, observedAt));
+}
diff --git a/src/colibri-run-manifest.test.ts b/src/colibri-run-manifest.test.ts
new file mode 100644
index 0000000..7e0e3b7
--- /dev/null
+++ b/src/colibri-run-manifest.test.ts
@@ -0,0 +1,102 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  COLIBRI_RUN_MANIFEST_SCHEMA,
+  parseColibriRunManifest,
+  parseColibriRunManifestJson,
+  summarizeColibriRunManifest,
+} from './colibri-run-manifest.js';
+
+const VALID_MANIFEST = {
+  schema: COLIBRI_RUN_MANIFEST_SCHEMA,
+  test_id: 'osa-clean-download-20260514T120000Z',
+  role: 'server-capture',
+  host: 'osa',
+  agent: 'codex-iso-builder',
+  started_at: '2026-05-14T12:00:00Z',
+  ended_at: '2026-05-14T12:01:30Z',
+  protocols: {
+    download: 'HTTPS over TCP/443',
+    capture: 'local libpcap',
+    artifact_transfer: 'SSH over TCP/22 when needed',
+  },
+  network: {
+    capture_interface: 'vtnet0',
+    remote_host: 'debby',
+  },
+  artifacts: {
+    pcapng: '/home/clawdie/clawdie-iso/tmp/network-tests/test/osa.pcapng',
+    capinfos: '/home/clawdie/clawdie-iso/tmp/network-tests/test/capinfos.txt',
+  },
+  summary: {
+    retransmits_observed: false,
+  },
+  raw_transfer_required: false,
+  notes: ['summary-first exchange'],
+};
+
+describe('colibri run manifest', () => {
+  it('parses a valid interagent run manifest', () => {
+    const result = parseColibriRunManifest(VALID_MANIFEST);
+
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.manifest.test_id).toBe('osa-clean-download-20260514T120000Z');
+    expect(result.manifest.protocols.download).toBe('HTTPS over TCP/443');
+    expect(result.manifest.artifacts.pcapng).toContain('osa.pcapng');
+  });
+
+  it('applies safe defaults for optional structured fields', () => {
+    const result = parseColibriRunManifest({
+      schema: COLIBRI_RUN_MANIFEST_SCHEMA,
+      test_id: 'minimal-run',
+      role: 'client-download',
+      host: 'debby',
+      started_at: '2026-05-14T12:00:00Z',
+    });
+
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.manifest.protocols).toEqual({});
+    expect(result.manifest.network).toEqual({});
+    expect(result.manifest.artifacts).toEqual({});
+    expect(result.manifest.summary).toEqual({});
+    expect(result.manifest.raw_transfer_required).toBe(false);
+    expect(result.manifest.notes).toEqual([]);
+  });
+
+  it('rejects manifests with the wrong schema', () => {
+    const result = parseColibriRunManifest({
+      ...VALID_MANIFEST,
+      schema: 'other.schema',
+    });
+
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.errors.join('\n')).toContain('schema');
+  });
+
+  it('parses JSON text and reports invalid JSON', () => {
+    expect(parseColibriRunManifestJson(JSON.stringify(VALID_MANIFEST)).ok).toBe(
+      true,
+    );
+
+    const result = parseColibriRunManifestJson('{not-json');
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.errors[0]).toContain('invalid JSON');
+  });
+
+  it('renders a compact summary for agents and handoffs', () => {
+    const result = parseColibriRunManifest(VALID_MANIFEST);
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+
+    const summary = summarizeColibriRunManifest(result.manifest);
+    expect(summary).toContain('<colibri-run-manifest>');
+    expect(summary).toContain('test_id=osa-clean-download-20260514T120000Z');
+    expect(summary).toContain('protocols=download=HTTPS over TCP/443');
+    expect(summary).toContain('artifacts=pcapng,capinfos');
+    expect(summary).toContain('raw_transfer_required=NO');
+  });
+});
diff --git a/src/colibri-run-manifest.ts b/src/colibri-run-manifest.ts
new file mode 100644
index 0000000..f672389
--- /dev/null
+++ b/src/colibri-run-manifest.ts
@@ -0,0 +1,84 @@
+import { z } from 'zod';
+
+export const COLIBRI_RUN_MANIFEST_SCHEMA =
+  'clawdie.interagent.run-manifest.v1' as const;
+
+export const ColibriRunManifestSchema = z.object({
+  schema: z.literal(COLIBRI_RUN_MANIFEST_SCHEMA),
+  test_id: z.string().min(1),
+  role: z.string().min(1),
+  host: z.string().min(1),
+  agent: z.string().min(1).optional(),
+  started_at: z.string().min(1),
+  ended_at: z.string().min(1).nullable().optional(),
+  protocols: z
+    .object({
+      download: z.string().min(1).optional(),
+      capture: z.string().min(1).optional(),
+      artifact_transfer: z.string().min(1).optional(),
+    })
+    .default({}),
+  network: z.record(z.string(), z.unknown()).default({}),
+  artifacts: z.record(z.string(), z.string()).default({}),
+  summary: z.record(z.string(), z.unknown()).default({}),
+  raw_transfer_required: z.boolean().default(false),
+  notes: z.array(z.string()).default([]),
+});
+
+export type ColibriRunManifest = z.infer<typeof ColibriRunManifestSchema>;
+
+export type ColibriRunManifestParseResult =
+  | { ok: true; manifest: ColibriRunManifest }
+  | { ok: false; errors: string[] };
+
+export function parseColibriRunManifest(
+  input: unknown,
+): ColibriRunManifestParseResult {
+  const parsed = ColibriRunManifestSchema.safeParse(input);
+  if (parsed.success) return { ok: true, manifest: parsed.data };
+
+  return {
+    ok: false,
+    errors: parsed.error.issues.map((issue) => {
+      const path = issue.path.length > 0 ? issue.path.join('.') : '(root)';
+      return `${path}: ${issue.message}`;
+    }),
+  };
+}
+
+export function parseColibriRunManifestJson(
+  text: string,
+): ColibriRunManifestParseResult {
+  let raw: unknown;
+  try {
+    raw = JSON.parse(text);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return { ok: false, errors: [`invalid JSON: ${message}`] };
+  }
+  return parseColibriRunManifest(raw);
+}
+
+export function summarizeColibriRunManifest(
+  manifest: ColibriRunManifest,
+): string {
+  const artifactNames = Object.keys(manifest.artifacts);
+  const protocolNames = Object.entries(manifest.protocols)
+    .filter((entry): entry is [string, string] => typeof entry[1] === 'string')
+    .map(([key, value]) => `${key}=${value}`);
+
+  return [
+    '<colibri-run-manifest>',
+    `schema=${manifest.schema}`,
+    `test_id=${manifest.test_id}`,
+    `role=${manifest.role}`,
+    `host=${manifest.host}`,
+    `agent=${manifest.agent ?? 'unknown'}`,
+    `started_at=${manifest.started_at}`,
+    `ended_at=${manifest.ended_at ?? 'pending'}`,
+    `protocols=${protocolNames.join(',') || 'none'}`,
+    `artifacts=${artifactNames.join(',') || 'none'}`,
+    `raw_transfer_required=${manifest.raw_transfer_required ? 'YES' : 'NO'}`,
+    '</colibri-run-manifest>',
+  ].join('\n');
+}